44 



CALIFORNIA ACADEMY OF SCIENCES. 



Olivella intorla Carpenter 



Olivella pedroana Conrad 



Opalia horealis Gould 



Opalla crenitoides var. insculpta Carpenter. . 



Pachypoma incequah Martyn 



Paludeslrina carta, sp. uov 



Paludesirina stokesi, sp. uov 



Phaxianella compia Gould 



Phomis pullirjo Martyn 



Physa helerostropha Say 



Pisanhi fortis Carpenter 



Planorbis iumidun Pfeiffer 



Planorbis vermicularis Gould 



Pleurotoma (Borsonia) hartxchi, sp. uov 



Pli'.uroloma (Dolichotoma) carpenleriana Gabb 

 Pleurotoma (Dolicholoma) cooperi, sp. nov , . . . 



Pleurotoma {BorKonia) dalli, sp. nov 



Pleurotoma {Borionia) hooveri, sp. nov 



Pleurotoma (Leucosyrinx) pedroana, sp. nov. . 



Pleurotoma perversa Gabb 



Pleurotoma (Drillia) renaudi, sp. nov 



Pleurotoma (Spirolropsis) mniihi, sp. nov 



Pleurotoma (Dolichotoma) Iryoniana Gabb 



Pomaulax undosun Wood 



Priene oregonenain Bedfield 



Puncturella cucullata Gould 



Puncturella galeaia Gould 



Purpura crinpala Chemnitz 



Purpura saxicola Valenciennes 



Pyramidtdla conica var. varicgata Carpenter. . 



Rane.Ua calif ornica Hinds 



Ri/isoa aculelirata Carpenter 



Scala belUutriata Carpb.nter 



S'cala cribricontata Carpenter 



Scala hf.mphUU Dall 



a u 

 tli u 



X 

 X 

 X 

 X 



X 

 E 

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 S 

 N 

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 E 

 E 

 X 

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 X 

 X 

 X 

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s 



X 



s 



X 

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Pleistocene. 



Upper San Pedro. 



as 



c 



K 

 K 



M 



M 



E 





c 



K 

 E 



E 

 E 

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E 



M 

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M 

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E 

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E 

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B 

 C 



rt o 



M 

 B 



E 



M 



Lower 

 Sau Pedro, 



a^ 



c 



M 



B 



M 



B 

 B 

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 M 



E 

 E 

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3. 



SCO 



in 



C 

 M 



B 

 B 

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E 



B 



E 

 E 



B 





M 

 M 



M 



M 

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C 

 M 

 M 





