CO 
bo 
first Annual Report 
Septifer bifurcatus Roe 
Distribution same as Mytilus bifurcatus 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 Conr. 
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. 
