ON MOLLUSCA OF THE WEST COAST OF NORTH AMERICA. 223 



B. Polar Fauna of the Behring Sea. 



Chiton submarmoreus, tunicatus and 



vestitus. 

 Patella patina, pelta. 

 Paludinella ? cingulata. 

 Littorina subtenebrosa, Sitchana, grandis. 

 Margarita sulcata. 

 Scalaria Ochotensis. 

 Crepidula grandis. 

 Trichotropis insignis. 



Cancellaria arctica. 



Purpura Freycinetii, decemcostata. 



Pleurotoma Schantaricum, simplex. 



Tritonium (Fusus) Behringii, Baerii. 



Bullia ampullacea. 



[Placun-] Anomia macrochisma. 



Modiola vernicosa. 



Nucula arctica. 



Tellina edentula, lutea. 



C. Circumpolar Species, p. 319. 



Patella caeca. 



Paludinella stagnalis, aculeus. 



Lacuna glacialis. 



Margarita striata, arctica. 



Natica pallida, clausa, aperta, flava, heli- 



coides. 

 Scalaria grcenlandica. 

 Velutina haliotoidea. 

 Trichotropis borealis, bicarinata. 

 Purpura lapillus. 



Tritonium (Trophon) clathratum. 

 T. (Fusus) antiquum, contrarium, Is- 



landicum, Sabinii, Norvegicum, 10-cos- 



tatum. 

 T. (Buccinum) undatum, tenebrosum, 



ovum. 

 Limacina arctica. 



Onychotheutis Bergii, Kamtschatica. 

 Terebratula psittacea. 



[Placun-] Anomia patelliformis. 



Pecten Islandicus. 



Modiola modiolus, nigra. 



Mytilus edulis. 



Nucula pygmsea. 



Cardita borealis. 



Cardium Nuttallii. [Probably belongs 



to B.] 

 Astarte Danmoniensis, Scotica, corrugata, 



compressa. 

 Venus Astartoides. 

 Saxicava pholadis. 

 Tellina solidula, lata. 

 Mactra ovalis. 

 Lyonsia Norvegica. 

 Mya truncata, arenaria. 

 Panopsea Norvegica. 

 Machaera costata. 



An analysis of the species belonging to the Pacific waters is given in pp. 349 

 et seq. The following are as yet only known from the Asiatic coast : — 



Chiton Pallash and amiculatus. 

 Trochus Schantaricus. 

 Pilidium commodum. 



Tritonium Schantaricum, simplex, Ocho- 



tense, ooides, cancellatum. 

 Terebratula frontalis. 



The following have been found both on the east and west sides of the 

 Pacific :— 



Chiton Stelleri, Brandtii, lineatus. 

 Littorina Kurila. 

 Velutina coriacea, spongiosa. 

 Haliotis Kamtschatkana, aquatilis. 



Modiola cultellus. 

 Cardium Nuttallii, Californiense. 

 Venerupis gigantea, Petitii. 

 Tellina nasuta. 



Of the species (so far as we yet know) peculiar to the American shores, 

 the following are recorded by MiddendorfF as not having been found below 

 Sitcha ; the list, however, will have to be materially modified : — 



Chiton Sitchensis, lividus, Eschscholzii, 



Merckii. 

 Patella digitalis, persona, personoides, 



pileolus, Asmi. 

 Turritella Eschrichtii. 

 Trochus modestus. 

 Dentalium politum. 

 Crepidula Sitchana, minuta. 



Trichotropis insignis. 

 Purpura septentrionalis. 

 Tritonium Sitchense, luridum. 

 Murex lactuca, monodon. 

 Pecten rubidus. 

 Petricola gibba. 

 Nucula castrensis. 

 Pectunculus septentrionalis. 



