426 University of California Publications in Geology [Vol. 8 



Astrodapsis tumidus Remond. 



Astrodapsis whitneyi Eemond. 

 *Acila conradi Meek. 



Amiantis dalli, n. sp. 

 *Chione pabloensis, n. sp. 

 *Chione diabloensis, n. sp. 



Cyrena (Corbicula) californica 



Macoma diabloensis, n. sp. 

 Macoma andersoni, n. sp. 

 Mulinia densata Conrad var. A. 



Dosinia arnoldi, n. sp. 



Dosinia merriami var. occidentalis, 



n. var. 



Gabb. 



Mytilus perrini, n. sp. 



Mytilus trampasensis, n. sp. 



Ostrea titan Conrad. 



Peeten bilineatus, n. sp. 

 *Peeten holwayi, n. sp. 



Pecten pabloensis Conrad. 



Pinna alamedensis Yates. 

 *Pinna, sp. indt. 

 *Sanguinolaria? sp. 

 *Tellina englishi, n. sp. 

 *Tellina pabloensis, n. sp. 



Tivela gabbi, n. sp. 



Venus martini, n. sp. 



Astralium raymondi, n. sp. 

 *Bittium pabloensis, n. sp. 



Bittium trampasensis, n. sp. 



Cerithium rodeoensis, n. sp. 



bloensis, n. var. 



Cancellaria pabloensis, n. sp. 

 *Chrysodomus buwaldi, n. sp. 

 *Chrysodomus diabloensis, n. sp. 

 *Leptothyra pabloensis, n. sp. 

 *Littorina pittsburgensis, n. sp. 



Murex (Ocinebra) dalli, n. sp. 



Nassa pabloensis, n. sp. 



Natica (Neverita) arnoldi, n. sp. 

 *Tegula (Chlorostoma) danvillen- 



Calliostoma bicarinatum, n. sp. 

 Calliostoma splendens var. dia- 



sis, n. sp. 

 Tegula (Chlorostoma) nashi, n. sp. 

 Trophon carisaensis Anderson. 

 Trophon ponderosum Gabb var. 



diabloensis, n. var. 

 Trophon lawsoni, n. sp. 



*Cerithiopsis bolingerensis, n. sp. 



The lists show that the lower major fatmal zone contains fewer 

 characteristic species than the upper. In almost every section de- 

 scribed, the collecting in the lower zone is not so good as in the upper. 

 It would not be safe to conclude finally as to the distinctness of the 

 two faunas, for more thorough collecting in the future may prove 

 a greater range for some of the species now regarded as characteristic 

 of one or the other of the zones. 



The following species common in the upper and lower zones have 

 not been found in beds younger than the San Pablo Group : 



Scutella gabbii Remond. Zirphaea dentata Gabb. 



Modiolus gabbi, n. sp. Murex (Ocinebra) packardi, n. sp. 



Mulinia pabloensis Packard. Natica (Neverita) pabloensis, 



Peeten crassieardo Conrad. n. sp. 

 Pecten raymondi, n. sp. 



