78 
1047 Rissoa? cooperi Tryon. 
Monterey to San Diego. 
1048 Rissoa? exilis Tryon. 
Santa Barbara to San Diego. 
1049 Rissoa fllosa Carpenter. 
Monterey, California, or southward. 
1051 Rissoa purpurea Dall. 
Monterey, Cal. 
1$52 R. (Alvania) reticulata Carpenter. 
Neeah bay, Washingtonia, to Galapagos Islands. 
1053 Saxidomus brevisiphonatus Carpenter. 
Straits of Fuca—Vancouver Island. 
1054 Scala bellastriata Carpenter. 
San Pedro to San Diego, Cal. 
1055 Scala crebricostata Carpenter. 
Monterey to San Diego, Cal. 
1056 Scala cumingi Carpenter. 
Monterey, Cal., to Panama. 
1057 Scala gracilis? Sowerby. 
San Diego, Cal. 
1058 Scala hindsii Carpenter. 
Bodega bay, Cal., to Panama. 
1059 Scala indianorum Carpenter. 
Straits of Fuca to San Diego, Cal. 
1060 Scala occidentalis Nyst. 
San Pedro, Cal. 
1061 Scala retiporosa Cpr. 
Catalina Island, California, 40 fms, 
1062 Scaphella stearnsii Dall. 
Ounalaska to Shumagin and Aleutian Islands. 
1063 Selenites vancouverensis Lea. 
Sitka, Alaska, to Eastern California and Lower California. 
1064 Serripes greenlandicus Chemnitz. 
Circumboreal—south to Massachusetts—in Pacific to Straits 
of Fuca, Washington. 
1065 Serripes laperousi Lamarck. 
North Pacific to Kodiak Island, Alaska. 
1066 Siliqua patula Dixon. 
Alaska to San Diego—Asia. 
1067 Siphonaria brannani Stearns. 
Santa Barbara Island, California. 
1068 Skenea planorbis Fabricius. 
Circumboreal—South to British Islands, Florida, and Alaska. 
1069 Solariella perambilis Carpenter. 
Vancouver Island, British Columbia, to Catelina Island, Cali- 
fornia—San Diego? 
1070 Styliferina turrita Carpenter. 
San Pedro, Cal. 
1071 Scurria gigantea Gray. 
Farallon Islands, California, to Lower California. 
1072 Selenites simplicilabris Ancey. 
Both sides of San Francisco bay, California. 
1073 Sigaretus concavus Lamarck. 
San Pedro, Cal., to Chili, South America. 
1074 Siphonaria thersites Carpenter. 
Sitka, Alaska, to Puget Sound, Wash. 
1075 Sphezrium occidentale Prime. 
Vermont to Washingtonia—Canada. 
1076 Spherium spokani Baird. 
British Columbia to Spokane river, Wash. 
