ON MOLLUSCA OP THE WEST COAST OF NORTH AMERICA. 223 



B. Polar Fauna of the Behring Sea, 



Chiton submarmoreus, tunicatus and 



vestitus. 

 Patella patina, pelta. 

 Paludinella ? cingiilata. 

 Littorina subtenebrosa, Sitchana, grandis. 

 Margai-ita sulcata. 

 Scalaria Ochotensis. 

 Crepidtda graudis. 

 Trichotropis insignis. 



Cancellaria arctica. 



Purpura Freycinetii, decemcostata. 



Pleurotoma Schantaricum, simplex. 



Tritonium (Fusus) Behringii, Baerii. 



BulUa 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. 



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 Pallasii and amicidatus. Tritonium Schantaricum, simplex, Ocho- 



Trochus Schantaricus. tense, ooides, cancellatum. 



Pilidium commodum. Terebratula frontalis. 



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

 Pacific : — 



[Placun-] Anomia patelhformis. 



Pecten Islandicus. 



Modiola modiolus, nigra. 



Mytilus eduhs. 



Nucula pygmaea. 



Cardita borealis. 



Cardium Nuttallii. [Probably belongs 



to B.] 

 Astarte Danmoniensis, Scotica, corrUgata, 



compressa. 

 Venus Astai-toides. 

 Saxicava pholadis. 

 Tellina solidula, lata. 

 Mactra ovalis. 

 Lyonsia Norvegica. 

 Mya truncata, arenaria. 

 Panopaea Norvegica. 

 Machaera costata. 



Chiton Stelleri, Brandtii, lineatus. 

 Littorina Kurila. 

 Velutina coriacea, spongiosa. 

 HaUotis Kamtschatkana, aquatiUs. 



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, Trichotropis insignis. 



Merckii. 

 Patella digitalis, persona, personoides, 



pileolus, Asmi. 

 Turritella Eschrichtii. 

 Trocbus modestus. 

 DentaUum politum. 

 Crepidula Sitchana, minuta. 



Purpura septentrionalis. 

 Tritonium Sitchense, Im-idum. 

 Murex lactuca, monodon. 

 Pecten rubidus. 

 Petricola gibba. 

 Nucvda castrensis. 

 Pectunculus septentrionalis. 



