388 CALIFORNIA ACADEMY OF SCIENCES. 



EXPLANATION OF PLATE XIIL 



Cooperella subdiaphana Carpenter. Lower San Pedro series, Deadman Island. 



Interior, showing hinge. Longitude 12.5 mm.; XS- i53 



Callista subdiaphana var. pedroana, var. nov. Lower San Pedro series, Deadman 



Island. Type specimen. Longitude 33 mm.; xo.8. 144 



Aligeva cerritensis, sp. nov. Upper San Pedro series, Los Cerritos. Type speci- 

 men, view of interior. Longitude 10.9 mm.; X3. 138 

 Callista subdiaphana Carpenter. Pliocene, Deadman Island. Longitude 45 mm.; 



XO.S. 144 



Psephis laJitilla GoV'LD. Lower San Pedro series, Deadman Island. View of inte- 

 rior. Longitude 6 mm. ; X4. 133 

 Pecten ( Paiinopccten) caurinus Gould. Pliocene, Deadman Island. Exterior of 



left valve. Altitude 122 mm.; xo.8. 107 



Tellina ( Moerella) sahnonea Carpenter. Lower San Pedro series, Deadman 



Island. Interior of right valve. Longitude 14 mm. ; X3.3. 157 



Donax lavigata Deshaves. Upper San Pedro series, San Pedro. Interior view. 



Longitude 21 mm.; X2.5. 170 



Donax californica Conrad. Lower San Pedro series, Deadman Island. Interior 



view. Longitude 17 mm.; X2.5. 170 



