55 
657 Astarte corrugata Brown. 
Circumboreal?—south to Massachusetts. Sitka, Alaska. 
658 Astarte esquimalti Baird. 
Vancouver Island. 
659 Astarte fluctuata Carpenter. 
Catalina Island, California, 40-60 fathoms. 
660 Astarte undata? Gould. 
Nearctic?—south to New York and Vancouver Island. 
661 Astralium inzequale Martyn. 
Vancouver Island to Lower California. 
662 Astralium (Uvanilla) regina Stearns. 
Guadalupe Island, Lower California. 
663 Astralium undosum Wood. 
Monterey to Cape St. Lucas. 
664 Atlanta peroni Lesueur. 
Pacific ocean. 
665 Axinzea subobsoleta Carpenter. 
Vancouver Island to Santa Cruz, Cal. 
Considered as var. of Axinza septentrionalis by some authors. 
666 Barbatia gradata Sowerby. 
Santa Barbara to San Diego—Japan—Mexico to Peru, South 
America. See under Arca. 
667 Barliza haliotiphila Carpenter. 
See under Barleeia. 
668 Bela exarata Moller. 
Arctic sea, North Atlantic, and Vancouver Island. 
669 Bela excurvata Carpenter. 
Straits of Fuca, Wash. 
670 Bela fidicula Gould. 
Vancouver Island to Puget Sound, Wash. 
671 Bela tabulata Carpenter. 
Vancouver to Puget Sound, Wash. 
672 Bela trevelliana Turton. 
Circumboreal?—-south to British Islands and Vancouver Isl. 
673 Bela violacea Mighels. 
Nearctic—south to Massachusetts, and Vancouver Island, on 
the Pacific. 
674 Berendtia taylori Pfeiffer. 
Mountains near Muleja, Lower California. 
675 Binneya notabilis Cooper. 
Depressed, smooth and shining, epidermis extending beyond 
margin of aperture, translucent when young, but opaquely thick- 
