198 
1237 
2713 
2079 
2570 
2470 
2471 
2472 
2473 
2474 
2475 
2476 
2477 
2346 
562 
1458 
1459 
1460 
1461 
439 
1114 
1354 
1355 
1115 
1425 
47 
Turbonilla torquata Gld 
Turbonilla (Mormula) tridentata Cpr. 
Turbonilla Gabbiana 
Turbonilla (Pyrgolampros) Alaskana 
Turbonilla (Pyrgiscus) castanella 
Turbonilla Lowei D. & B. 
Turbonilla Simpsoni D. & B. 
Turbonilla hypolispa D. &. B. 
Variety stylina Cpr. 
Turbonilla auricoma D. & B. 
Turbonilla aresta D. & B. 
Turbonilla tridentata catalinensis D. & B. 
Turbonilla latifunda D. & B. 
Turbonilla buttoni Dall & Bartsch. 
Turcicula bairdii Dall. Off S. Clemente Isl., in 414 fms. 
Turris (Antiplanes) diaulax Dall. 
Turris (Surcula) ophioderma Dall. 
Turris (Surcula) rhines Dall. 
Turris (Surcula) halcyonis Dall. 
Turritella cooperi Carpenter. 
Turritella jewetti Carpenter. 
Turtonia minuta Fabricius. 
Turtonia occidentalis Dall. 
Tylodina fungina Gabb. 
Typhis Martyria Dall. 
56 Unio complanatus 
57 Unio Heterodon 
1668 
1633 
1605 
2306 
1938 
2897 
1672 
1673 
1674 
1581 
1786 
2261 
1116 
1656 
1675 
1657 
1117 
2691 
2692 
2693 
2581 
2679 
1118 
Unio Oregonensis Lea. 
Urosalpinx cinereus 
Uvanilla regina 
Uvanilla unguis Mawe. 
Vaginulus olivacea 
Genus Vallonia Risso, 1826. 
Vallonia minuta Say. 
Vallonia excentrica Sterki. 
Vallonia albula Sterki. 
Vallonia costata Muller. 
Vallonia costata montana: Rocky Mts. 
Vallonia costata montana Sterki. 
Vallonia cyclophorella Ancey. 
Vallonia gracilicosta Reinh. 
Vallonia parvula Sterki. 
Vallonia perspectiva Sterki. 
Vallonia pulchella Muller. 
Valvata Calli 
Valvata Whitei 
Valvata Utahensis Call. 
Valvata humeralis Say. (See 2679.) 
Valvata humeralis californica 
Valvata sincera Say. 
45 Valvata tricarinata 
1119 
3054 
2274 
1120 
1121 
1122 
2946 
380 
Valvata virens Tryon. 
Varieties 
Vasum cestrum Brod. 
Velutina cryptospira Middendorf. 
Velutina levigata Pennant. 
Velutina prolongata Carpenter. 
Venericardia Alaskana Dall. 
Venericardia borealis ventricosa Gould 
