38 



CALIFORNIA ACADEMY OF SCIENCES. 



Semele decisa Conrad 



Semele pulchra Soweeby 



Semele pnlchra v&r. monlereyi, var.uov. 



c 



CUTS 



a, 



X 

 X 



N 



Septifer bifurcatus Conrad X 



Siliijua iiicida CoNRAD 



Siliqua patula var. nuttalli Conrad 



Solen rosaceus Carpenter X 



X 



N 



Solen sicarius Gould X 



Tagelus californianus Conrad X 



Tapes laciniata Carpenter X 



Tapes staminea Conrad X 



Tapes tenerrima Carpenter X 



TMina bodegensis Hinds X 



Tellina ida Dall X 



Tellina rubescetis Hanley S 



Thracia Irapezoides Conrad E 



Thyasira bisecta Conrad N 



Thyasira gouldii Philippi X 



Tivela crassatelloides Conrad X 



Tresus nuttalli Conrad X 



Venericardia barbarensh Stearns X 



Venerkardia venlricosa Godld N 



Venus (Chione) flucti/raga Sowerby X 



Ve.nus (Chione) gnidia Broderip & Sowerby S 



Venus (Chione) neglecta Sowerby j S 



Venus (Chione) simillima Sowerby t X 



X 

 X 

 X 

 X 

 X 



Venus (Chione) succincta Valenciennes 



Verticordia novemcostala Adams & Reeve. 



Yoldia cooperi Gabb 



Yoldia scissurata Dall 



Zirphoea gabbi Tryon 



Pleistocene. 



Upper San Pedro. 



M 



R 



R 

 C 



C 

 R 

 R 



R 

 C 



Lower 

 San Pedro. 



■25 



M 

 C 



B 



.CO 



M 

 R 



M 

 R 



R 

 C 

 R 

 C 

 R 

 C 



C 

 C 

 R 



R 

 R 

 R 



C 

 C 



R 



M 



C 

 R 



M 



R 

 C 

 M 

 C 

 R 

 C 

 R 



M 

 R 



R 

 C 

 C 



cd o 



S-o 



R 

 R 



M 



M 

 R 

 R 



R 

 R 

 R 



R 



C 



M 



R 

 R 

 R 



R 

 C 



M 



R 

 R 



R 



a m 

 to" 

 in 



M 



M 



R 



M 



M 

 M 



R 



C 

 R 



C 

 C 



R 



M 



C 

 R 

 R 



M 

 C 



