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21:0776 Amalthea tumens Cpr. Is Hipponyx t. 
21:0777 Amaura Moeller. Sec. of Odostomia. 
21:0778 Amphidesma decisa Conr. Is Semele d. 
21:0779 Amphidesma pulchra Sby. Is Semele p. 
21:0780 Ampullina purpurea Dall. Alaska. 
21:0781 Amusium caurinum Gld. Is Pecten ec. 
21:0782 Amycla carinata Hds. Is Columbella ec. 
21:0783 Amycla chrysalloidea Cpr. Is Columbella c. 
21:0784 Amycla gausapata Gid. Is Columbella g. 
21:0785 Amycla tuberosa Cpr. Is Columbella t. 
21:0786 Angulus modestus of Cal. lists, is Tellina buttoni. 
21:0787 Anodonta beringiana Midd. 
Is A. cygnea L. var? . 
21:0788 Anodonta cygnea L. 
The European and American shells have been described un- 
der over a hundred different names. The Pacific Coast shell has 
been called A. oregonensis, and the two principal varieties are 
known as impura and beringiana. 
21:0789 Anodonta impura Say. Is A. cygnea var. 
21:0790 Anodonta wahlametensis. Is A. cygnea var. 
21:0791 Anomia lampe Gray. Is A. peruviana. 
21:0792 Anomia macroschisma Desh. Is Pododesma m. 
21:0793 Arca labiata Sby. 
Gulf of Cal., Central America, West Indies. 
San Pedro, Cal. (Pleistocene). 
21:0794 Ariolimax niger. 
21:0795 Artemis ponderosa Gray. Is Dosinia p. 
21:0796 Astraea inaequalis Mart. 
Formerly called Pachypoma i. 
21:0797 Astralium inaequalis Mart. Is Astraea i. 
21:0798 Astyris H. & A. Ad. Is subg. Columbella. 
21:0799 Astyris chrysalloidea Spr. Is Columbella C. 
21:0800 Axinia barbarensis Conr. Is Glycymeris b. 
21:0801 Axinia intermedia Cp. in part (non Brod.), is Glycy- 
meris barbarensis. 
21:0802 Bela fidicula Gld., 1849 sub Fusus. 
Puget Sound. San Pedro, Cal. (Pleistocene). 
21:0803 Bela sanctae-monica Arnold, 1908. 
San Pedro, Cal. (Pleistocene). 
21:0804 Bela sculpturata Dall. Is Mangilia s. 
21:0805 GenusBittium Leach. 4 
Shell elevated, with numerous granular whorls and irregu- 
lar varices; anterior canal short, not recurved; inner lip simple; 
outer lip not reflected, usually with an exterior rib. 
21:0806 Bittium asperum Gabb, 1861 sub Turbonilla. 428. 
Shell 10.5 mm long, diam. 3; aperture 2.5 by 1.5; turreted, 
slender; apex elevated, acute; whorls 9-10, nearly flat on posterior 
portion, with prominent angulation anteriorly; sculpture consists 
of 3 spiral ridges, crossed by 16-18 much more prominent ridges; 
suture deep, distinct; aperture semi-elliptical, with prominent 
basal emargination instead of a canal; lip thin, inner side crenu- 
lated; body whorl angulated, base slightly sculptured spirally. 
Santa Barhara, Cal., to Baja Cal. 
