| Class | Order | Family | Genus | Species | Authority | Common Name | Sources (full citations given below this table) |
| Anthozoa | Actiniaria | Actiniidae | Aulactinia | stella | (Verrill) | ? | DMC (as Bunodea stella |
| Anthozoa | Actiniaria | Actiniidae | Bolocera | tuediae | (Johnston) | ? | DMC |
| Anthozoa | Actiniaria | Actiniidae | Urticina | felina | (L.) | ? | Procter (1933, p. 126., as Tealia felina) |
| Anthozoa | Actiniaria | Edwardsiidae | Edwardsia | elegans | Verrill | ? | DMC |
| Anthozoa | Actiniaria | Edwardsiidae | Nematostella | vectensis | Stephenson | ? | DMC |
| Anthozoa | Actiniaria | Halcampidae | Halcampa | duodecimcirrata | (Sars) | twelve-tentacle burrowing anemone | DMC |
| Anthozoa | Actiniaria | Haliplanellidae | Haliplanella | lineata | (Verrill) | ? | DMC (as Haliplanella (= Sagartia) luciae) |
| Anthozoa | Actiniaria | Haloclavidae | Peachia | parasitica | (Agassiz) | ? | DMC |
| Anthozoa | Actiniaria | Metridiidae | Metridium | senile | (L.) | ? | DMC |
| Anthozoa | Ceriantharia | Cerianthidae | Cerianthus | borealis | Verrill | ? | DMC |
| Hydrozoa | Anthoathecatae | Acaulidae | Acaulis | primarius | Stimpson | ? | DMC; Pollock (1998); Procter (1993, p. 117.) |
| Hydrozoa | Anthoathecatae | Bougainvilliidae | Bougainvillia | carolinensis | (McCrady) | ? | Procter (1993, p. 116.), Pollock (1998) |
| Hydrozoa | Anthoathecatae | Bougainvilliidae | Bougainvillia | superciliaris | (L. Agassiz) | ? | DMC; Pollock (1998) |
| Hydrozoa | Anthoathecatae | Bougainvilliidae | Garveia | franciscana | (Torrey) | rope-grass | Pollock (1998) |
| Hydrozoa | Anthoathecatae | Corymorphidae | Corymorpha | pendula | L. Agassiz | nodding bouquet hydroid | Procter (1933, p. 117.), Pollock (1998) |
| Hydrozoa | Anthoathecatae | Corynidae | Coryne | eximia | Allman | ? | DMC (as Sarsia eximia |
| Hydrozoa | Anthoathecatae | Corynidae | Linvillea | agassizi | (McCrady) | ? | Procter (1933, p. 116., as Corynitis agassizii) |
| Hydrozoa | Anthoathecatae | Corynidae | Sarsia | tubulosa | (M. Sars) | clapper hydroid | DMC; Pollock (1998) |
| Hydrozoa | Anthoathecatae | Eudendriidae | Eudendrium | album | Nutting | white stickhydroid | DMC; Procter (1933, p. 117.) |
| Hydrozoa | Anthoathecatae | Eudendriidae | Eudendrium | carneum | Clarke | red stickhydroid | Procter (1933, p. 117.) |
| Hydrozoa | Anthoathecatae | Eudendriidae | Eudendrium | dispar | L. Agassiz | ? | Procter (1933, p. 116.) |
| Hydrozoa | Anthoathecatae | Eudendriidae | Eudendrium | ramosum | (L.) | stickhydroid | Procter (1933, p. 116.) |
| Hydrozoa | Anthoathecatae | Hydractiniidae | Clava | multicornis | (Forsskål) | club hydroid | DMC (as Clava leptostyla); Pollock (1998); Procter (1933, p. 116. as Clava leptostyla) |
| Hydrozoa | Anthoathecatae | Hydractiniidae | Hydractinea | carnea | (M. Sars) | ? | DMC (as Podocoryne carnea |
| Hydrozoa | Anthoathecatae | Hydractiniidae | Hydractinia | polyclina | L. Agassiz | ? | Procter (1933, p. 116.) |
| Hydrozoa | Anthoathecatae | Oceanidae | Cordylophora | caspia | (Pallas) | freshwater hydroid | Pollock (1998) |
| Hydrozoa | Anthoathecatae | Oceanidae | Rhizogeton | fusiformis | L. Agassiz | freshwater hydroid | Pollock (1998) |
| Hydrozoa | Anthoathecatae | Rathkeidae | Rathkea | octopunctata | (M. Sars) | ? | DMC |
| Hydrozoa | Anthoathecatae | Tubulariidae | Ectopleura | crocea | (L. Agassiz) | ? | DMC (as Tubularia crocea); Procter (1933, p. 117., as Tubularia crocea) |
| Hydrozoa | Anthoathecatae | Tubulariidae | Ectopleura | larynx | (Ellis and Solander) | ringed tubularia | Procter (1933, p. 117., as Tubularia tenella) |
| Hydrozoa | Anthoathecatae | Tubulariidae | Ectopleura | tenella | (Ellis and Solander) | ? | DMC (as Tubularia tenella) |
| Hydrozoa | Anthoathecatae | Tubulariidae | Hybocodon | prolifer | L. Agassiz | ? | DMC |
| Hydrozoa | Leptothecatae | Calycellidae | Calycella | syringa | (L.) | creeping bell hydroid | Procter (1933, p. 122.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Campanularia | amphora | (Agassiz) | ? | Procter (1933, p. 119.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Campanularia | calceolifera | Hincks | ? | Procter (1933, p. 119.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Campanularia | caliculata | ? | ? | Procter (1933, p. 120., [as Orthopyxis caliculata (Hincks)?]) |
| Hydrozoa | Leptothecatae | Campanulariidae | Campanularia | flexiosa | (Hincks) | ? | Procter (1933, p. 119., [as Campanularia flexuosa (Alder)?]) |
| Hydrozoa | Leptothecatae | Campanulariidae | Campanularia | neglecta | (Alder) | ? | Procter (1933, p. 119.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Campanularia | volubilis | (L.) | ? | Procter (1933, p. 119.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Clytia | gracilis | (M. Sars) | ? | Procter (1933, p. 120., as Clytia cylindrical) |
| Hydrozoa | Leptothecatae | Campanulariidae | Clytia | hemisphaerica | (L.) | ? | Procter (1933, p. 120., as Clytia bicophora) |
| Hydrozoa | Leptothecatae | Campanulariidae | Gonothyraea | loveni | (Allman) | ? | DMC; Procter (1933, p. 121.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Hartlaubella | gelatinosa | (Pallas) | ? | DMC |
| Hydrozoa | Leptothecatae | Campanulariidae | Laomedea | neglecta | Alder | ? | DMC; Procter (1933, p. 119., as Campanularia fragilis) |
| Hydrozoa | Leptothecatae | Campanulariidae | Phialidium | bicophorum | (A. Agassiz) | ? | DMC |
| Hydrozoa | Leptothecatae | Campanulariidae | Phialidium | languidum | (A. Agassiz) | ? | DMC |
| Hydrozoa | Leptothecatae | Campanulariidae | Obelia | dichotoma | (L.) | sea thread hydroid | Procter (1933, p. 120., also as Obelia gracilis) |
| Hydrozoa | Leptothecatae | Campanulariidae | Obelia | geniculata | (L.) | knotted thread hydroid | DMC; Procter (1933, p. 120.) |
| Hydrozoa | Leptothecatae | Campanulariidae | Obelia | longissima | (Pallas) | ? | DMC (also as Obelia commissuralis);Procter (1933, p. 120., also as Obelia commissuralis) |
| Hydrozoa | Leptothecatae | Campanulariidae | Obelia | trichomata | (L.) | sea thread hydroid | DMC |
| Hydrozoa | Leptothecatae | Campanulariidae | Orthopyxis | integra | (MacGillivray) | ? | Procter (1933, p. 119., as Campanularia integra) |
| Hydrozoa | Leptothecatae | Eirenidae | Tima | formosa | L. Agassiz | ? | DMC |
| Hydrozoa | Leptothecatae | Haleciidae | Halecium | articulosum | Clark | ? | DMC; Procter (1933, p. 119.) |
| Hydrozoa | Leptothecatae | Haleciidae | Halecium | beanii | (Johnston) | ? | Procter (1933, p. 117.) |
| Hydrozoa | Leptothecatae | Haleciidae | Halecium | halecinum | (L.) | herringbone hydroid | Procter (1933, p. 118.), Pollock (1998) |
| Hydrozoa | Leptothecatae | Haleciidae | Halecium | tenellum | Hincks | ? | Procter (1933, p. 119.) |
| Hydrozoa | Leptothecatae | Halopterididae | Halopteris | tenella | (Verrill) | ? | DMC (as Schizotricha tenella); Pollock (1998, as Schizotricha tenella) |
| Hydrozoa | Leptothecatae | Lafoeidae | Filellum | serpens | (Hassall) | ? | Procter (1933, p. 123.) |
| Hydrozoa | Leptothecatae | Lafoeidae | Hebella | venusta | (Allman) | ? | Procter (1933, p. 121., as Hebella calcarata) |
| Hydrozoa | Leptothecatae | Lafoeidae | Lafoea | dumosa | (Fleming) | ? | Procter (1933, p. 123.) |
| Hydrozoa | Leptothecatae | Lovenellidae | Lovenella | grandis | Nutting | ? | Procter (1933, p. 123.) |
| Hydrozoa | Leptothecatae | Melicertidae | Melicertum | campanula | ? | ? | DMC |
| Hydrozoa | Leptothecatae | Phialellidae | Opercularella | lacerata | (Johnston) | ? | Procter (1933, p. 122.) |
| Hydrozoa | Leptothecatae | Phialellidae | Opercularella | pumila | Clark | ? | DMC |
| Hydrozoa | Leptothecatae | Sertulariidae | Abietinaria | abietina | (L.) | sea-fir | Procter (1933, p. 124.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Diphasia | fallax | (Johnston) | ? | Procter (1933, p. 123.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Diphasia | rosacea | (L.) | lily hydroid | DMC; Procter (1933, p. 123.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Dynamena | pumila | (L.) | ? | DMC |
| Hydrozoa | Leptothecatae | Sertulariidae | Hydrallmania | falcata | (L.) | sickle hydroid | Procter (1933, p. 124.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Sertularella | polyzonias | (L.) | great tooth hydroid | Procter (1933, p. 124.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Sertularella | rugosa | (L.) | snail trefoil hydroid | Procter (1933, p. 124.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Sertularella | tricuspidata | (Alder) | ? | Procter (1933, p. 124.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Sertularia | argentea | L. | squirrel's tail hydroid | Procter (1933, p. 124., as Thuiaria argentea) |
| Hydrozoa | Leptothecatae | Sertulariidae | Sertularia | cupressina | L. | sea cypress hydroid | DMC (as Sertularia cupressina argentea); Procter (1933, p. 124., as Thuiaria cupressina) |
| Hydrozoa | Leptothecatae | Sertulariidae | Sertularia | pumila | L. | ? | DMC; Procter (1933, p. 123.) |
| Hydrozoa | Leptothecatae | Sertulariidae | Thuiaria | thuja | (L.) | bottlebrush hydroid | Procter (1933, p. 124.) |
| Hydrozoa | Leptothecatae | ? | Cuspidella | grandis | Hincks | ? | Procter (1933, p. 122.) |
| Hydrozoa | Siphonophorae | Agalmatidae | Nanomia | cara | A. Agassiz | ? | DMC |
| Hydrozoa | Leptothecatae | Tiaropsidae | Tiaropsis | multicirrata | (M. Sars) | ? | DMC |
| Hydrozoa | Trachymedusae | Rhopalonematidae | Aglantha | digitale | (O. F. Müller) | ? | DMC |
| Hydrozoa | ? | ? | Cuspidella | humilis | (Alder) | ? | DMC |
| Hydrozoa | ? | ? | Hydratinia | echinata | ? | ? | DMC |
| Hydrozoa | ? | ? | Tiaropsis | diademata | ? | ? | DMC |
| Hydrozoa | ? | ? | Tubularia | larynx | ? | ? | DMC |
| Scyphozoa | Semaeostomeae | Cyaneidae | Cyanea | capillata | (L.) | lion’s mane | DMC; Procter (1933, p. 125., as Cyanea artica) |
| Scyphozoa | Semaeostomeae | Ulmaridae | Aurelia | aurita | (L.) | moon jelly | DMC; Procter (1933, p. 125., as Aurelia aurita (flavidula)) |
| Staurozoa | Stauromedusae | Lucernariidae | Haliclystus | auricula | (Rathke) | ? | DMC |
| Staurozoa | Stauromedusae | Lucernariidae | Lucernaria | quadricornis | O. F. Müller | ? | DMC; Procter (1933, p. 125.) |