82 



jTirst Annual Report 



Septifer bifurcatus Roe 

 Distribution same as Mi/tHux liifitrcatiix but rarer. 



PSEUDOLAMELLIBRANCHIATA 



Ostrea lurida Cpr. 



Found in lower tide pools and on rocks uncovered but a short 

 time at low tide. Not at all common. 



Figure 43. Mytilus californianus 



EULAMELLIBRANCHIATA 



Phacoides californicus Cuiir. 



Semele rupium Sby. 

 Tivela stultorium Mawe 



Chama pellucida Sby. 



The above four shells are found washed up on the beach, the last 

 two quite common. 



