431 
635 
3100 
2282 
2283 
636 
467 
637 
174 
1616 
1617 
1427 
2507 
2609 
2610 
638 
639 
640 
641 
1948 
3 
Amphithalamus inclusus Carpenter. 
Amphithalamus lacunatus Carpenter. 
Amphithalamus tenuis 
Anachis coronata Sby. 
Anachis sulcosa Sby. 
Anachis coronata Sowerby. 
Anachis penicillata Carpenter. 
Anachis subturrita Carpenter. 
Anachis subturrita Cpr 
Genus Anadenus 
Anadenus cockerelli H. Hemphill. 
Anaplocamus borealis Dall. 
Ancula Pacifica 
Ancylus (Lanx) altus 
Ancylus Newberryi 
Ancylus caurinus W. Cooper. 
Ancylus crassus Hald. 
Ancylus fragilis Tryon. 
Ancylus kootaniensis Baird. 
Ancylus oregonensis Clessin. 
44 Ancylus parallelus 
642 
1659 
2434 
Ancylus patelloides Lea. 
Ancylus rivularis Say. 
Angulus Carpenteri Dall. 
Synonymy:—Angulus variegatus Cpr. (not Gmel.). 
1174 
1171 
1172 
1535 
1173 
2611 
643 
3169 
644 
1148 
1149 
1150 
1534 
1660 
1661 
Angulus gouldii Carpenter. 
Angulus modestus Carpenter. 
Angulus obtusus Carpenter. 
Angulus salmonea Cpr. 
Angulus variegatus Carpenter. 
Anisodoris nobilis 
Anodonta angulata Lea. 
Anodonta Californiensis 
Anodonta kennerleyi Lea. 
Anodonta nuttalliana Lea. 
Variety Californiensis Lea. See Cooper, Zoe 3:23. 
Variety Idahoensis Henry Hemphill. 
Andcdonta Oregonensis Lea. 
Anodonta ovata Lea. 
Anodonta plana Lea. 
55 Anodonta undulata 
2321 
647 
134 
2900 
1884 
2130 
264 
319 
2313 
125 
2613 
2351 
2612 
409 
1364 
648 
649 
650 
2070 
Anomalocardia subimbricata Sby. 
Anomalocardia subrugosa Sowerby. 
Anomia lampe 
Genus Aphallarion Pilsbry and Vanatta. 
Aphallarion Buttoni Pils. & Van. 
Aplexa hypnorum 
Aplysia californica Cooper 
Arca (Barbatia) gradata Sby 
Arca grandis B. & S. 
Arca Multicostata 
Arca mutabilis Sby. 
Arca reeviana Orb. 
Arca reticulata Gmel. 
Argonauta argo Linne. 
Argonauta expansa 
Argonauta hians Solander. 
Argonauta pacifica Dall. 
Ariolimax andersoni W. G. Binney. 
Argobuccinum oregonense 
645 
646 
