ARNOLD — THE PALEONTOLOGY AND STKATKiHAPHY OF SAN PEDRO. 



39 



GASTROPODA. 



Acmcea dc/iicta Gould 



Acmtta insessa Hinds 



Acmaa inctabiiis Gould 



Arman mllra ESCHSCHOLTZ 



Acmaa paleacea Gould 



Acmma pelta Eschscholtz 



Armxa sjii-ctnim (Nuttall) Reeve 



Actaioji ( Rictaxix) punclocuilala Carpenter. 



AcU^on traskii Stearns 



A dmete. ijracilior Carpenter 



Amphissa corrugaia Kbeve 



A mphissa ventricosa, sp. nov , , 



Am/ihiiKii versicolor Dall 



Btia fiilirula Gould 



Bchi sancliK-monkiK sp. nov 



liltlium asiierum Gabb 



liUtiiim cali/urnirum Dall & Bartsch 



liill.iiimtito.iiim Gould 



liitliiim tptad riji latum Carpenter 



liiuium rugatum Carpenter 



BiUinm wiltiamsoni, sp. nov 



Bullii piuiclnlata A. Adams 



Bulla ijuoyi Gray 



Gacum californicum Dall 



Citcum crehriciiictiim Carpenter 



Cceciim magnum Stkakns 



Calliosloma annulatum Maktyn 



Calliostoma caniculatum Martyn 



Calliostoma costalum Martyn 



Calliostoma gemmulatum Carpenter 



Calliostoma tricolor Gabb 



Caitceltaria cooperi Gabb 



Caneellaria crair/ordiniia Dali 



Canccdaria tritonidia G.'VBB 



a u 

 tfi It 



S 

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E 

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s 



X 

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J 



X 

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s 



E 



Pleistocene. 



Upper San Pedro. 



R 



5'" 



M 



R 

 M 

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 R 



E 



C 

 R 

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 C 

 K 

 R 

 E 



M 

 M 

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M 



E 



C 



E 

 B 



C 

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1» 

 " 9 



R 

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 R 





 C 



c 



R 



R 



M 

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M 



C 

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Lower 

 San Pedro. 



g-2 



M 



E 

 E 

 R 



R 

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C 

 R 

 R 



M 

 R 



B. 3 



M 



M 

 M 

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M 

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M 

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En 



•a CO 



M 



R 



B 



