36 



CALIFORNIA ACADEMY OF SCIENCES. 



Olycyriieris septe/iirionalis Middendorf . 



Hinnites giganleus Gray 



Kellia laperousi! Deshayes 



Kellia mborbiciilaris Montague 



Kennerlia hicarinata Carpenter 



Kennerlia filosa Carpenter 



Lcevicardium substriatum Conrad 



Lazaria mbquadrata Carpenter 



Leda fosna Baird 



Leda hamaia Carpenter 



Leda minuta var. prcecursor, var. nov. . 



Leda taphria Dall 



Lima dehiscens Conrad 



Lithophagus plumula Han ley 



Lucina acuiilineaia Conrad 



Lucina californica Conrad 



Lucina nutlalli Conrad 



Lucina tenuisculpla Carpenter 



Lyonsia californica Conrad 



Macoma calcarea Gmelin 



Macoma indentata Carpenter 



Macoma inquinata Deshayes 



Macoma nasuta Conrad 



Macoma nasuta var. kelseyi Dall 



Macoma secta Conrad 



Macoma yoldi/ormis Carpenter 



Maclra californica Conrad 



Mactra (Spisula) calilliformit Conrad. , 



Mar.tra exolela Gray 



Mactra (Spisula) falcata Gould 



Mactra hcmphilli Da ll 



Metis alta Conrad 



Modiola fornicala Carpbnter 



Modiola recta Conrad 



McereUa salmonea Carpenter 



MytiluH edulis Linn^us 



CB-O 



N 

 X 

 X 

 X 



c 



N 

 X 

 X 

 N 

 X 

 N 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 

 N 

 X 

 X 

 X 



s 



X 

 X 



X 

 X 



s 



X 



s 



X 



N 

 X 

 N 

 X 



Pleistocene. 



Upper San Pedro. 





K 

 R 



R 



R 

 E 



C 



E 

 M 



B 



M 



R 



B 



3^ 



c 



M 



C 

 C 



M 



R 

 R 

 C 

 E 

 R 



R 

 C 

 C 

 M 

 C 



M 

 C 

 R 

 C 

 B 

 R 



B 



Or 

 ►Jfc 



R 

 R 



R 



M 



R 



R 

 C 



R 

 C 

 M 

 M 

 R 



C 

 E 

 R 





E 

 E 



R 

 R 



R 



E 

 E 

 M 



R 



M 



R 



E 



M 



Lower 

 San Pedro. 



as 



■O CO 



R 

 R 

 R 

 E 

 E 

 R 

 M 

 B 

 R 

 C 

 E 



C 

 C 

 C 



M 

 M 



M 

 C 



E 

 E 



R 

 B 

 E 

 C 

 R 



B<3 



E 

 R 

 B 



R 

 B 



B 

 B 



C 

 C 

 C 



M 

 B 



as 



-a cs 



c 

 c 



c 



M 



