AKNOLD — THE PALEONTOLOGY AND STKATIGKAPHY OF SAN PEDRO. 



39 



GASTKOPODA. 



Acmcea depicta Gould 



Acmma insessa Hikds 



Acmcea inslabilis Gould 



Acmcea mitra Eschscholtz 



Acmcea pateacea Gould 



Acmcea pelta Eschscholtz 



Acmcea spectrum (Nuttall) Keeve 



Actceoii ( Rictaxis) punctoccelata Carpenter. 



Actceon iraskii Stearns 



Admete gracilior Carpenter 



Amphissa corrugala Eeeve 



Amphissa ventricosa, sp. nov 



Amphissa versicolor Dall 



Beta fidicula Gould 



Bcla sanctce-monica: sp. nov 



Bittium asperum Gabb 



Bittium californicum Dall & Bartsch 



Bittium filosum Gould 



Bittium (jvadrijiiatum Carpenter 



Bittium rugaitnn Carpenter 



Bittium wiUiamsoni, sp. nov 



Bulla punctulata A. Adams 



Bulla quoyi Gray 



Ccecum californicum Dall 



Ccecum crebricinctum Carpenter 



Ca'cum magnum Stearns 



Calliostoma annulatum Martyn 



Caltiosloma caniculatum Makiyn 



Calliostoma costatum Martyn 



Calliostoma gemmulatum Carpenter 



Calliostoma tricolor Gabb 



Canccllaria cooperi Gabb 



Cancellaria craw/orcliana Dall 



Cancellaria tritonidca Gabb 



3 





s 



X 

 N 

 X 

 X 

 X 

 X 

 X 



9 



E 

 X 

 E 

 X 



N 

 E 

 X 

 E 

 N 

 X 

 X 



V 



s 



X 

 X 

 X 



; 



X 

 X 

 X 

 X 

 X 

 X 



s 



E 



Pleistocese. 



Upper San Pedro. 



5a 



K 



K 





M 



E 

 M 

 K 

 R 



C 

 R 

 C 

 E 

 C 

 E 

 E 

 E 



M 

 M 

 M 

 M 

 M 

 E 

 E 

 E 



E 



M 



E 



R 



R 



C 



R 

 E 



C 

 E 

 R 

 R 



"I 



" 9. 



E 

 M 

 R 

 C 

 C 



C 

 E 



E 



M 

 C 



M 



C 

 R 

 R 

 R 



Lower 

 San Pedro. 



M 



E 

 E 

 E 



E 

 E 

 E 

 R 

 R 

 E 

 M 

 R 

 M 

 M 

 C 



C 

 R 

 R 



M 

 R 





M 



E 



M 

 M 

 C 



M 

 C 

 E 



M 

 R 



11 



M 



E 



E 



