44 



CALIFOKNIA ACADEMY OF SCIENCES. 



Olivella intoria Carpknteb 



Olivella petlroana Conrad 



Opalia hori'alis Gould 



Opalia creniloide.s var. insculpta Carpentbr. . 



Pachypoma incequale Martyn 



Paludestrina curia, sp. nov 



Paltidnslrina stokesi, sp. nov 



Phaxianella r.ompia Gould 



Phorcus pulligo Martvn 



Phyna helerostropha Say 



PIsania fortis Carpenter 



Planorbis tuinidus Pfeiffer 



PlanorhU verinicularis Gould 



Pleurotoma (Borsonia) bartschi, sp. nov 



P kuroioma (Dolichotoma) carpenteriana Gabb 

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



Pleurotoma (Borsonia) dalli, sp. nov 



Pleurotoma (Borsonia) hooveri, sp. nov 



Pleurotoma (Leucosy rinx) pedroana, sp. nov. . . 



Pleurotoma perversa Gabb 



Pleurotoma (Drillia) rniaudi, sp. nov 



Pleurotoma (Spirolropsis) smithi, sp. nov 



Pleurotoma (Dolichotoma) tryoniana Gabb..., 



Pomaulax undosus Wood 



Priene orerjonensis KedfielD 



Puncturella cucullata Gould 



Puncturella galeata Gould 



Purpura crispata Chemnitz 



Purpura saxicola Valenciennes 



Pyramidilia conica var. variegata Carpenter.. 



Ranella californica Hinds 



Rissoa aculelirata Carpenter 



Scala bellnstriata Carpenter 



Scala crebricostata Carpenter 



Scala hemphilli Dall 



CM 



X 

 X 

 X 

 X 

 X 

 E 

 E 

 X 

 X 

 X 

 E 

 S 

 N 

 E 

 X 

 E 

 E 

 E 

 E 

 X 

 E 

 E 

 X 

 X 

 X 

 N 

 N 

 N 

 X 



s 



X 



s 



X 

 X 



E 



Pleistocene. 



Upper San Pedro. 



c 



R 



M 



M 



R 



E 



3^ 



c 



E 



R 



E 

 E 

 E 



C 



E 



M 

 M 



M 

 R 



K 

 E 

 E 

 E 



E 

 E 

 E 

 C 

 E 

 E 

 M 

 E 



R 

 C 



rt o 



M 

 E 



E 



E 



M 



Lower 

 San Pedro. 



c 



M 



E 



M 



E 

 E 

 E 

 E 

 E 

 M 



E 

 R 

 E 



•a .to 



Ok 3 



in 



C 



M 



E 

 E 

 E 

 E 



R 



E 

 E 



E 



E 



Pliocene. 



M 

 M 



M 



R 



M 

 E 

 M 



C 

 M 

 M 



go 



