431 Amphithalamus inclusus Carpenter. 



635 Amphithalamus lacunatus Carpenter. 

 3100 Amphithalamus tenuis 



2282 Anachis coronata Sby. 



2283 Anachis sulcosa Sby. 



636 Anachis coronata Sowerby. 

 467 Anachis penicillata Carpenter. 



637 Anachis subturrita Carpenter. 

 174 Anachis subturrita Cpr 



1616 Genus Anadenus 



1617 Anadenus cockerelli H. Hemphill. 

 1427 Anaplocamus borealis Dall. 

 2507 Ancula Pacifica 



2609 Ancylus (Lanx) altus 



2610 Ancylus Newberry i 



638 Ancylus caurinus W. Cooper. 



639 Ancylus crassus Hald. 



640 Ancylus fragilis Tryon. 



641 Ancylus kootaniensis Baird. 

 1948 Ancylus oregonensis Clessin. 

 44 Ancylus parallelus 



642 Ancylus patelloides Lea. 



1659 Ancylus rivularis Say. 

 2434 Angulus Carpenteri Dall. 



Synonymy: — Angulus variegatus Cpr. (not Gmel.). 

 1174 Angulus gouldii Carpenter. 



1171 Angulus modestus Carpenter. 



1172 Angulus obtusus Carpenter. 

 1535 Angulus salmonea Cpr. 



1173 Angulus variegatus Carpenter. 



2611 Anisodoris nobilis 



643 Anodonta angulata Lea. 

 3169 Anodonta Calif orniensis 



644 Anodonta kennerleyi Lea. 



1148 Anodonta nuttalliana Lea. 



1149 Variety Californiensis Lea. See Cooper, Zoe 3:23. 



1150 Variety Idahoensis Henry Hemphill. 

 1534 Andodonta Oregonensis Lea. 



1660 Anodonta ovata Lea. 



1661 Anodonta plana Lea. 

 55 Anodonta undulata 



2321 Anomalocardia subimbricata Sby. 645 



647 Anomalocardia subrugosa Sowerby. 

 134 Anomia lampe 



2900 Genus Aphallarion Pilsbry and Vanatta. 



1884 Aphallarion Buttoni Pils. & Van. 



2130 Aplexa hypnorum 



264 Aplysia californlca Cooper 646 



319 Area (Barbatia) gradata Sby 



2313 Area grandis B. & S. 



125 Area Multicostata 



2613 Area mutabilis Sby. 



2351 Area reeviana Orb. 



2612 Area reticulata Gmel. 

 409 Argonauta argo Linne. 

 1364 Argonauta expansa 



648 Argonauta hians Solander. 



649 Argonauta pacifica Dall. 



650 Ariolimax andersoni W. G. Binney. 

 2070 Argobuccinum oregonense 



