Most of the working checklist below of mollusc species is based on Pollock (1998), which reported them as occurring between Cape Cod and Newfoundland. Please send corrections and updates to info@vfthomas.com. Photographs are welcome. Thank you.
| Class | Order | Family | Genus | Specific Epithet | authority | common name | Sources (full citations given after this table) |
| Gastropoda | Archaeogastropoda | Calliostomatidae | Calliostoma | bairdii | A. E. Verrill & S. Smith | Baird topsnail | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Calliostomatidae | Calliostoma | occidentale | (Mighels & C. B. Adams) | boreal topsnail | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Fissurellidae | Puncturella | noachina | (L.) | diluvian puncturella | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Trochidae | Lischkeia | ottoi | (Philippi) | otto spiny topsnail | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Trochidae | Lischkeia | regularis | ? | spiny topsnail | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Trochidae | Margarites | costalis | (Gould) | boreal rosy margarite | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Trochidae | Margarites | groenlandicus | (Gmelin) | Greenland margarite | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Trochidae | Margarites | helicinus | (Phipps) | spiral margarite | Pollock (1998) |
| Gastropoda | Archaeogastropoda | Trochidae | Solariella | obscura | (Couthouy) | obscure solarelle | Pollock (1998) |
| Gastropoda | Archaeopulmonata | Ellobiidae | Leucophytia | bidentata | ? | eastern melampus, salt marsh pulmonate | Pollock (1998) |
| Gastropoda | Archaeopulmonata | Ellobiidae | Phytia | myosotis | Say | mouse melampus | Pollock (1998) |
| Gastropoda | Cephalaspidea | Cylichnidae | Scaphander | punctostriatus | (Mighels & C. B. Adams) | giant canoe-bubble | Pollock (1998) |
| Gastropoda | Gymnosomata | Clionidae | Clione | limacina | (Phipps) | naked sea butterfly | Pollock (1998) |
| Gastropoda | Heterostropha | Mathildidae | Turritellopsis | acicula | (Stimpson) | needle turretsnail | Pollock (1998) |
| Gastropoda | Heterostropha | Pyramidellidae | Odostomia | spp. | ? | ? | Pollock (1998) |
| Gastropoda | Heterostropha | Pyramidellidae | Pyramidella | spp. | ? | ? | Pollock (1998) |
| Gastropoda | Heterostropha | Pyramidellidae | Turbonilla | spp. | ? | ? | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Buccinum | scalariforme | Moller | ladder whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Buccinum | totteni | Stimpson | thin whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Buccinum | undatum | L. | waved whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Colus | pubescens | (A. E. Verrill) | hairy whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Colus | pygmaeus | (Gould) | pygmy whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Colus | stimpsoni | (Mørch) | Stimpson whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Colus | terraenovae | Bouchet & Warren | ventricose whelk | Pollock (1998) as Colus ventricosus |
| Gastropoda | Neogastropoda | Buccinidae | Neptunea | despecta | (L.) | disreputable whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Neptunea | lyrata ssp. ? | (Gmelin) | wrinkle whelk | Pollock (1998) |
| Gastropoda | Neogastropoda | Buccinidae | Volutopsius | norwegicus | (Gmelin) | Norway whelk | Pollock (1998) as Volutopsius norvegicus |
| Gastropoda | Neogastropoda | Cancellariidae | Admete | couthouyi | (Jay) | northern admete | Pollock (1998) |
| Gastropoda | Neogastropoda | Columbellidae | Astyris | lunata | (Say) | lunar dovesnail | Pollock (1998) |
| Gastropoda | Neogastropoda | Columbellidae | Astyris | rosacea | (Gould) | rosy northern dovesnail | Pollock (1998) |
| Gastropoda | Neogastropoda | Conidae | Pyrgocythara | plicosa | (C. B. Adams) | plicate mangelia | Pollock (1998) |
| Gastropoda | Neogastropoda | Muricidae | Boreotrophon | clathratus | (L.) | clathrate trophon | Pollock (1998) |
| Gastropoda | Neogastropoda | Muricidae | Boreotrophon | craticulatum | ? | latticed trophon | Pollock (1998) |
| Gastropoda | Neogastropoda | Muricidae | Nucella | lapillus | (L.) | Atlantic dogwinkle | Pollock (1998); Champlainer (TFV) |
| Gastropoda | Neogastropoda | Nassariidae | Nassarius | obsoletus | (Say) | eastern mudsnail | Pollock (1998) as Ilyanassa obsoleta |
| Gastropoda | Neogastropoda | Nassariidae | Nassarius | trivittatus | (Say) | threeline mudsnail | Pollock (1998) as Ilyanassa trivittatus |
| Gastropoda | Neogastropoda | Volutomitridae | Volutomitra | groenlandica | (Moller) | false Greenland miter | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Aporrhaididae | Aporrhais | occidentalis | Beck | American pelicanfoot | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Calyptraeidae | Crepidula | convexa | Say | convex slippersnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Calyptraeidae | Crepidula | fornicata | (L.) | common Atlantic slippersnail | Pollock (1998) |
| Gastropoda | Neotaenioglosa | Calyptraeidae | Crepidula | plana | Say | eastern white slippersnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Calyptraeidae | Crucibulum | striatum | Say | striate cup-and-saucer | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Cerithiidae | Bittium | alternatum | (Say) | alternate bittium | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Epitoniidae | Acirsa | borealis | (Lyell) | chalky wentletrap | Pollock (1998) as Acirsa borealis and Acirsa costulata |
| Gastropoda | Neotaenioglossa | Epitoniidae | Boreoscala | greenlandica | (G. Perry) | Greenland wentletrap | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Hydrobiidae | Hydrobia | totteni | Morrison | minute hydrobia | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Lamellariidae | Lamellaria | perspicua | (L.) | transparent lamellaria | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Littorinidae | Lacuna | vincta | (Montagu) | northern lacuna | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Littorinidae | Littorina | littorea | (L.) | common periwinkle | Pollock (1998); Champlainer (TFV) |
| Gastropoda | Neotaenioglossa | Littorinidae | Littorina | obtusata | (L.) | yellow periwinkle, smooth periwinkle | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Littorinidae | Littorina | saxatilis | (Olivi) | rough periwinkle | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Naticidae | Amauropsis | islandica | (Gmelin) | Iceland moonsnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Naticidae | Bulbus | smithii | (Brown) | ? | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Naticidae | Cryptonatica | affinis | (Gmelin) | Arctic moonsnail | Pollock (1998) as Natica clausa |
| Gastropoda | Neotaenioglossa | Naticidae | Euspira | heros | (Say) | northern moonsnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Naticidae | Euspira | triseriata | (Say) | spotted moonsnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Skeneopsidae | Skeneopsis | planorbis | (Fabricius) | flat skenea, orbsnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Trichotropidae | Trichotropis | borealis | Broderip & G. B. Sowerby I | boreal hairysnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Turritellidae | Tachyrhynchus | erosus | (Couthouy) | eroded turretsnail | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Velutinidae | Velutina | undata | (T. Brown) | wavy lamellaria | Pollock (1998) |
| Gastropoda | Neotaenioglossa | Velutinidae | Velutina | velutina | (Muller) | smooth lamellaria | Pollock (1998) |
| Gastropoda | Nudibranchia | Aeolidiidae | Aeolidia | papillosa | (L.) | shag-rug aeolis, maned nudibranch | Pollock (1998) |
| Gastropoda | Nudibranchia | Chromodorididae | Cadlina | leavis | (L.) | white Atlantic cadlina | Pollock (1998) |
| Gastropoda | Nudibranchia | Dendronotidae | Dendronotus | frondosus | (Ascanius) | frond-aeolis | Pollock (1998) |
| Gastropoda | Nudibranchia | Dendronotidae | Dendronotus | robustus | A. E. Verrill | robust frond-aeolis | Pollock (1998) |
| Gastropoda | Nudibranchia | Dotoidae | Doto | coronata | (Gmelin) | crown doto | Pollock (1998) |
| Gastropoda | Nudibranchia | Eubranchidae | Eubranchus | exiguus | (Alder & Hancock) | (dwarf) balloon aeolis | Pollock (1998) |
| Gastropoda | Nudibranchia | Eubranchidae | Eubranchus | pallidus | (Alder & Hancock) | club-gilled nudibranch | Pollock (1998) |
| Gastropoda | Nudibranchia | Facelinidae | Cratena | pilata | (Gould) | striped nudibranch | Pollock (1998) |
| Gastropoda | Nudibranchia | Facelinidae | Facelina | bostonensis | (Couthouy) | Boston facelina | Pollock (1998) |
| Gastropoda | Nudibranchia | Flabellinidae | Flabellina | gracilis | (Alder & Hancock) | ? | Pollock (1998) |
| Gastropoda | Nudibranchia | Flabellinidae | Flabellina | pellucida | (Alder & Hancock) | pellucid aeolis | Pollock (1998) |
| Gastropoda | Nudibranchia | Flabellinidae | Flabellina | salmonacea | (Couthouy) | salmon aeolis | Pollock (1998) |
| Gastropoda | Nudibranchia | Flabellinidae | Flabellina | verrucosa | (M. Sars) | red-finger aeolis | Pollock (1998) |
| Gastropoda | Nudibranchia | Goniodorididae | Ancula | gibbosa | (Risso) | Atlantic ancula | Pollock (1998) |
| Gastropoda | Nudibranchia | Onchidorididae | Acanthodoris | pilosa | (Abildgaard) | hairy spiny doris | Pollock (1998) |
| Gastropoda | Nudibranchia | Onchidorididae | Adalaria | proxima | (Alder & Hancock) | (yellow) false doris | Pollock (1998) |
| Gastropoda | Nudibranchia | Onchidorididae | Onchidoris | bilamellata | (L.) | barnacle-eating onchidoris | Pollock (1998) |
| Gastropoda | Nudibranchia | Onchidorididae | Onchidoris | muricata | (Muller) | fuzzy onchidoris | Pollock (1998) |
| Gastropoda | Nudibranchia | Polyceridae | Polycera | dubia | (M. Sars) | ridged sea slug | Pollock (1998) |
| Gastropoda | Nudibranchia | Tergipedidae | Catriona | gymnota | (Couthouy) | orange-tip cuthona | Pollock (1998) |
| Gastropoda | Nudibranchia | Tergipedidae | Cuthona | concinna | (Alder & Hancock) | ? | Pollock (1998) |
| Gastropoda | Nudibranchia | Tergipedidae | Tenellia | fuscata | (Gould) | ? | Pollock (1998) |
| Gastropoda | Nudibranchia | Tergipedidae | Tergipes | tergipes | (Forskal) | ? | Pollock (1998) |
| Gastropoda | Patellogastropoda | Lottiidae | Tectura | testudinalis | (Muller) | tortoiseshell limpet, plant limpet | Pollock (1998); Champlainer (TFV) |
| Gastropoda | Sarcoglossa | Stiligeridae | Ercolania | nigra [?] | ? | dusky stiliger | Pollock (1998) |
| Gastropoda | Thecosomata | Cavoliniidae | Cavolinia | uncinata | (Rang) | uncinate cavoline | Pollock (1998) |
| Gastropoda | Thecosomata | Cavoliniidae | Clio | pyramidata | L. | pyramid clio | Pollock (1998) |
| Gastropoda | Thecosomata | Cavoliniidae | Cuvierina | columnella | (Rang) | cigar pteropod | Pollock (1998) |
| Gastropoda | Thecosomata | Cavoliniidae | Diacria | trispinosa | (de Blainville) | three-spine cavoline | Pollock (1998) |
| Bivalvia | Myoida | Hiatellidae | Cyrtodaria | siliqua | (Spengler) | northern propellerclam | Pollock (1998) |
| Bivalvia | Myoida | Hiatellidae | Hiatella | arctica | (L.) | Arctic hiatella | Pollock (1998) |
| Bivalvia | Myoida | Hiatellidae | Panomya | norvegica | (Spengler) | Arctic roughmya | Pollock (1998) as Panomya arctica |
| Bivalvia | Myoida | Myidae | Mya | arenaria | L. | softshell (clam) | Pollock (1998) |
| Bivalvia | Myoida | Myidae | Mya | truncata | L. | truncate softshell | Pollock (1998) |
| Bivalvia | Myoida | Pholadidae | Pholas | dactylus | L. | European piddock | Pollock (1998) |
| Bivalvia | Myoida | Pholadidae | Zirfaea | crispata | (L.) | Atlantic great piddock | Pollock (1998) |
| Bivalvia | Mytiloida | Mytilidae | Crenella | glandula | (Totten) | glandular crenella | Pollock (1998) |
| Bivalvia | Mytiloida | Mytilidae | Geukensia | demissa | (Dillwyn) | ribbed mussel | Pollock (1998) |
| Bivalvia | Mytiloida | Mytilidae | Modiolus | modiolus | (L.) | northern horsemussel | Pollock (1998); Champlainer (TFV) |
| Bivalvia | Mytiloida | Mytilidae | Musculus | discors | (L.) | discordant mussel | Pollock (1998) |
| Bivalvia | Mytiloida | Mytilidae | Musculus | niger | (J. E. Gray) | black mussel | Pollock (1998) |
| Bivalvia | Mytiloida | Mytilidae | Mytilus | edulis | L. | blue mussel | Pollock (1998); Champlainer (TFV) |
| Bivalvia | Nuculoida | Nuculanidae | Nuculana | tenuisulcata | (Couthouy) | thin nutclam | Pollock (1998) |
| Bivalvia | Nuculoida | Nuculidae | Ennucula | tenuis | (Montagu) | smooth nutclam | Pollock (1998) as Nucula tenuis |
| Bivalvia | Nuculoida | Nuculidae | Nucula | delphinodonta | Mighels & C. B. Adams | dolphintooth nutclam | Pollock (1998) |
| Bivalvia | Nuculoida | Nuculidae | Nucula | proxima | Say | Atlantic nutclam | Pollock (1998) |
| Bivalvia | Nuculoida | Yoldiidae | Megayoldia | thraciaeformis | (Storer) | broad yoldia | Pollock (1998) as Yoldia thraciaeformis |
| Bivalvia | Nuculoida | Yoldiidae | Yoldia | amygdalea | Valenciennes | almond yoldia | Pollock (1998) |
| Bivalvia | Nuculoida | Yoldiidae | Yoldia | limatula | (Say) | file yoldia | Pollock (1998) |
| Bivalvia | Nuculoida | Yoldiidae | Yoldia | myalis | (Couthouy) | oval yoldia | Pollock (1998) |
| Bivalvia | Nuculoida | Yoldiidae | Yoldia | sapotilla | (Gould) | short yoldia | Pollock (1998) |
| Bivalvia | Ostreoida | Anomiidae | Anomia | simplex | (D'Orbigny) | common jingle | Pollock (1998) |
| Bivalvia | Ostreoida | Anomiidae | Anomia | squamula | L. | prickly jingle | Pollock (1998) |
| Bivalvia | Ostreoida | Ostreidae | Crassostrea | virginica | (Gmelin) | eastern oyster | Pollock (1998) |
| Bivalvia | Ostreoida | Pectinidae | Argopecten | irradians | (Lamarck) | bay scallop | Pollock (1998) |
| Bivalvia | Ostreoida | Pectinidae | Chlamys | islandica | Müller | Iceland scallop | Pollock (1998) |
| Bivalvia | Ostreoida | Pectinidae | Placopecten | magellanicus | (Gmelin) | sea scallop | Pollock (1998) |
| Bivalvia | Pholadomyoida | Cuspidariidae | Cuspidaria | glacialis | (G. O. Sars) | glacial dipperclam | Pollock (1998) |
| Bivalvia | Pholadomyoida | Cuspidariidae | Cuspidaria | rostrata | (Spengler) | rostrate dipperclam | Pollock (1998) |
| Bivalvia | Pholadomyoida | Lyonsiidae | Lyonsia | arenosa | (Moller) | sandy lyonsia | Pollock (1998) |
| Bivalvia | Pholadomyoida | Lyonsiidae | Lyonsia | hyalina | Conrad | glassy lyonsia | Pollock (1998) |
| Bivalvia | Pholadomyoida | Pandoridae | Pandora | gouldiana | Dall | Gould pandora | Pollock (1998) |
| Bivalvia | Pholadomyoida | Periplomatidae | Periploma | leanum | (Conrad) | Lea spoonclam | Pollock (1998) |
| Bivalvia | Pholadomyoida | Thraciidae | Thracia | conradi | Couthouy | Conrad thracia | Pollock (1998) |
| Bivalvia | Solemyoida | Solemyidae | Solemya | borealis | Totten | boreal awningclam | Pollock (1998) |
| Bivalvia | Solemyoida | Solemyidae | Solemya | velum | Say | Atlantic awningclam | Pollock (1998) |
| Bivalvia | Veneroida | Arcticidae | Arctica | islandica | (L.) | ocean quahog | Pollock (1998) |
| Bivalvia | Veneroida | Astartidae | Astarte | borealis | (Schumacher) | boreal tridonta | Pollock (1998) as Tridonta borealis |
| Bivalvia | Veneroida | Astartidae | Astarte | castanea | (Say) | smooth astarte | Pollock (1998) |
| Bivalvia | Veneroida | Astartidae | Astarte | crenata ssp. subequilatera | (Gray) / Sowerby | lentil astarte | Pollock (1998) as Astarte subaequilatera |
| Bivalvia | Veneroida | Astartidae | Astarte | montagui | (Dillwyn) | Montagu tridonta | Pollock (1998) as Tridonta montagui |
| Bivalvia | Veneroida | Astartidae | Astarte | undata | Gould | wavy astarte | Pollock (1998) |
| Bivalvia | Veneroida | Cardiidae | Cerastoderma | pinnulatum | (Conrad) | northern dwarf cockle | Pollock (1998) |
| Bivalvia | Veneroida | Cardiidae | Clinocardium | ciliatum | (Fabricius) | hairy cockle | Pollock (1998) |
| Bivalvia | Veneroida | Cardiidae | Serripes | groenlandicus | (Mohr) | Greenland cockle | Pollock (1998) |
| Bivalvia | Veneroida | Carditidae | Cyclocardia | borealis | (Conrad) | northern cyclocardia | Pollock (1998) |
| Bivalvia | Veneroida | Lucinidae | Lucinoma | filosa | (Stimpson) | northeast lucina | Pollock (1998) |
| Bivalvia | Veneroida | Mactridae | Mulinia | lateralis | (Say) | dwarf surfclam | Pollock (1998) |
| Bivalvia | Veneroida | Mactridae | Spisula | solidissima | (Dillwyn) | Atlantic surfclam | Pollock (1998) |
| Bivalvia | Veneroida | Mesodesmatidae | Mesodesma | arctatum | (Conrad) | Arctic wedgeclam | Pollock (1998) |
| Bivalvia | Veneroida | Petricolidae | Petricola | pholadiformis | (Lamarck) | false angelwing | Pollock (1998) as Petricola pholadiformis |
| Bivalvia | Veneroida | Pharidae | Ensis | directus | Conrad | Atlantic jackknife | Pollock (1998) |
| Bivalvia | Veneroida | Pharidae | Siliqua | costata | Say | Atlantic razor | Pollock (1998) |
| Bivalvia | Veneroida | Semelidae | Cumingia | tellinoides | (Conrad) | tellin semele | Pollock (1998) |
| Bivalvia | Veneroida | Tellinidae | Macoma | balthica | (L.) | Baltic macoma | Pollock (1998) |
| Bivalvia | Veneroida | Tellinidae | Macoma | calcarea | (Gmelin) | chalky macoma | Pollock (1998) |
| Bivalvia | Veneroida | Tellinidae | Macoma | tenta | (Say) | elongate macoma | Pollock (1998) |
| Bivalvia | Veneroida | Tellinidae | Tellina | agilis | Stimpson | northern dwarf tellin | Pollock (1998) |
| Bivalvia | Veneroida | Thyasiridae | Thyasira | trisinuata | (d'Orbigny) | Atlantic cleftclam | Pollock (1998) |
| Bivalvia | Veneroida | Veneridae | Gemma | gemma | Deshayes | amethyst gemclam | Pollock (1998) |
| Bivalvia | Veneroida | Veneridae | Mercenaria | mercenaria | (L.) | northern quahog | Pollock (1998) |
| Bivalvia | Veneroida | Veneridae | Pitar | morrhuanus | (Linsley) | false quahog | Pollock (1998) |
| Cephalopoda | Octopoda | Octopodidae | Bathypolypus | arcticus | (Prosch) | spoonarm octopus | Pollock (1998) |
| Cephalopoda | Sepiolida | Sepiolidae | Semirossia | tenera | (Verrill) | ? | Pollock (1998) |
| Cephalopoda | Teuthida | Ommastrephidae | Illex | illecebrosus | (Lesueur) | northern shortfin squid | Pollock (1998) |