1860 
1676 
2573 
1677 
1655 
1861 
1862 
1678 
1679 
1858 
2568 
49 
Vitrea indentata 
Vitrea Johnsoni 
Vitrea lucida Drap. Colo. 
Vitrea pugetensis 
Vitrea radiatula Alder. 
Vitrea subrupicola 
Vitrea subrupicola spelza 
Vitrea subrupicola 
Variety spelea Dall, Nautilus 9:27. 
Vitrea Whitneyi 
Vitrina Alaskana Dall. 
5 Vitrina limpida 
1128 
596 
598 
595 
594 
597 
2214 
1129 
2033 
166 
1130 
1224 
2034 
1389 
1890 
1391 
1392 
1393 
167 
440 
2478 
2706 
1188 
1189 
1131 
1132 
353 
1133 
1134 
318 
1135 
1136 
1137 
1138 
1477 
1614 
1156 
1139 
2951 
2952 
1438 
Vitrifina pfeifferi Newcomb. 
Vitrinella alaskensis 
V. (Docomphala) berryi 
Vitrinella eshnauri 
Vitrinella oldroydi 
V. (Docomphala) Stearnsi 
Vitrinella williamsoni Dall. 
Vivipara japonica Martyn. 
Vivipara malleata Reeve 
Volutella pyriformis Cpr 
Volutharpa ampullacea Middendorf. 
Volutoharpa meerchiana Fisher. See 1223. 
Volutomitra alaskana 
Volutopsius trophonius Dall. 
Volutopsius kobelti Dall. 
Volutopsius castaneus Meerch. 
Volutopsius attenuatus Dall. 
Volutopsius regularis Dall. 
Volvarina varia Sby 
Volvula cylindrica Carpenter. 
Williamia peltoides Cpr. 
Williamia vernalis 
Xylophaga dorsalis 
Xylotrya bipinnata 
Xylotrya fimbriata Jeffries. 
Xylotrya pinnatifera Blainville. 
Xylotrya setacea Tyron 
Xylotrya stutchburyi Jeffries. 
Yoldia amygdala Valenciennes. 
Yoldia cooperi Gabb 
Yoldia impressa Conrad. 
Yoldia lanceolata Sowerby. 
Yoldia limatula Say. 
Yoldia sapotilla Gould. 
Yoldia (Scissula) ensifera plena Dall. 
Yoldia Montereyensis 
Yoldia seminuda Dall. 
Yoldia thracizeformis Storer. 
Genus Zacoleus Pilsbry. 
Zacoleus Idahoensis Pilsbry. 
Zeidora flabellum Dall. 
99 Zirphaea crispata 
2418 
1571 
2884 
2743 
2744 
2745 
Zirfoea gabbi Tryon. 
Zonites cellarius Mull. 
Zonites selenitoides Pilsbry. 
Zonites Lansingii 
Zonites Stearnsii 
Zonites Shepardi 
