27 



283 Schizothaerus nuttallii Conr 



San Diego; Todos Santos bay. Kodiak Island, Alaska. Japan. 



284 Pandora (Clidiophora) punctata Cpr 



Single valves often washed ashore on sandy beaches. 



285 Thracia curta Conr 



Not rarely found imbedded in rocks; San Diego. Santa Rosa 

 Island (Yates). 



286 Thracia plicata ? Desh 



Numerous dead shells of this are washed up on the shores of 

 San Diego bay, with Lyonsia Californica and other bivalves. 



[Described from Southern fauna, but in absence of a larger 

 series the identification is not dogmatic. D.) 



287 Entodesma scammonii Dall 



One example found with the above species. 



288 Mactra planulata Conr 



Ocean beaches; not found abundantly. Also Todos Santos bay. 



289 Mactra falcata Gld 



Not found abundantly. 



[Belongs to Northern fauna. D.] 



290 Semele rupium Sby. 



This abounds on the rocky ocean beaches, but rarely collected 

 alive. 



291 Lutricola alta Conr 

 Not plentiful. 



292 CEdalina subdiaphana Cpr 



Bay shores; abundant, San Diego, Vancouver Isl. 



923 Cooperella scintillaeformis Cpr. 

 With the last; rarer. 



294 Cumingia californica Conr 



La Playa; abundant in dead bivalves or in holes. Todos San- 

 tos bay. 



295 Psammobia rubroradiata Nutt 



(See 2905.) Avatcha Bay, Kamchatka. (Dall.) 



296 Tellina Bodegensis Hds 



Not plentiful; San Diego. 



297 Tellina Gouldii Hani 



Abundant; San Diego bay. Also Todos Santos bay. 



298 Macoma secta Conr. 



Plentiful at times, as also indentata and inquinata. 



299 Macoma inquinata Desh 



300 Petricola carditoides Conr 



San Diego; not numerous; burrows in soft rock the length 

 of its shell. 



