546 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



Solecurtus californianus Conr. 



Abundaut, with the less common variety subteres. 



[Very close to tlie eastern species. D.] 

 Siliqua lucida Conr. 



Several examples have been found on the sandy ocean beaches at San 

 Diego and Todos Santos Bay. 



[This seems to be a valid species, though closely allied to 8. patula. D.] 



Platyodon cancellata Conr. 



Abundant at La Playa where they have been collected for food, but 

 the animal is bitter. Also Todos Santos Bay, but not found alive. 

 Saxicava rugosa Linu. 



Young specimens not rarely found among the roots of kelp when 

 washed ashore by a storm. 

 Corbula hiteola Cpr. 



Common beneath stones on the ocean beaches that are partially im- 

 ' bedded in shell sand. 

 Corbula sp. indet. 



San Diego and Todos Santos Bay. 



[A very thin species, resembling a Eucliaris ; perhaps from Southern 

 fauna. D.] 

 Cryptoraya californica Cour. 



Not rare. 

 Schizothaerus nuttallii Conr. 



San Diego; Todos Santos Bay. 



Pandora (Clidiophora) punctata Cpr. 



Single valves often washed ashore on sandy beaches. 

 Thracia curta Conr. 



Not rarely found imbedded in rocks ; San Diego. 

 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.] 

 Periploma argentaria Conr. 



Single valves only found ; not common. 

 Lyonsia californica Conr. 



Often washed ashore in great numbers on the bay shores. 

 Entodesma scanimoniiDall. 



One example found with the above species. 

 Mactra planulata Conr. 



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



Mactra falcata Gld. 



Not found abandantly. 



[Belongs to Northern fauna. D.] 

 Semele decisa Conr. 



This species, with Psammohia rubroradiata, Saxidomus aratus and 

 nuttallii, Tapes^staminea, and other bivalves are collected commonly a* 



