81 



1116 Vallonia cyclophorella Ancey. 



Rocky Mountains to Northern Pacific Coast. 



1117 Vallonia pulchella Muller. 



Circumboreal — south to Mono county, California — introduced 

 in Australia. 



1118 Valvata sincera Say. 



Mackenzie river to Minnesota (and Vancouver Island?). Utah. 



1119 Valvata virens Tryon. 



Shell turbiniform, of 4 well-rounded whorls; spire elevated, 

 apex acute, sutures deeply indented, periphery almost angulated; 

 umbilicus very wide; aperture oval or nearly round, the peristome 

 merely touching the body above. Surface closely striate. Color 

 brilliant to dark green. Height 5, diameter 5 mm. 



Living: Clear lake, California. Utah lake. 



1120 Velutina cryptospira Middendorf. 

 Sitka, Alaska, north and west to Asia. 



1121 Velutina laevigata Pennant. 



Circumboreal — south to Spain and Massachusetts — in Pacific 

 to Monterey, Cal., and Kamtschatka, Asia. 



1122 Velutina prolongata Carpenter. 

 Ounga Island, Alaska, to Monterey, Cal. 



1123 Venus kennerleyi Carpenter. 



Vancouver Island to Monterey, Cal. — Kamtschatka? 



1124 Venus toreuma Gould. 



Monterey to Catalina Island, California — "East Indies?" 

 Synonymy: — Venus fordi Yates. 



1125 Vermetus compactus Carpenter. 

 Straits of Puca to Peru, South America. 



1126 Vermetus squamigerus Carpenter. 

 Monterey to Peru, South America. 



1127 Verticordia aeutieostata Philippi. 



North Atlantic to West Indies — West America. 



1128 Vitrifina pfeifferi Newcomb. 



Sub-alpine Rocky Mountains and Sierra Nevada, California. 



1129 Vivipara japonica Martyn. 



Japan — imported into California for food. 



1130 Volutharpa ampullacea Middendorf. 

 Behring sea to Sitka and Kamtschatka. 



1131 Xylotrya fimbriata Jeffries. 



North Atlantic and Pacific — universal — carried about by ships. 

 England. 



1132 Xylotrya pinnatifera Blainville. 

 Universal? — carried about by ships. 



1133 Xylotrya stutchburyi Jeffries. 

 Universal? — carried about by ships. 



1134 Yoldia amygdala Valenciennes. 



Kodiak Island, Alaska, to Monterey, 40 fms., California. 



1135 Yoldia impressa Conrad. 

 Santa Cruz to San Pedro, Cal. 



1136 Yoldia lanceolata Sowerby. 



Straits of Fuca, north — Atlantic? Japan. 



1137 Yoldia limatula Say. 



North Atlantic, south to North Carolina, and Alaska. 



1138 Yoldia sapotilla Gould. 



Arctic sea to North Carolina and Alaska. 



1139 Yoldia thraeiieformis Storer. 



Nearctic — Alaska to Vancouver Island — Greenland to Massa- 

 chusetts. 



