PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



29 



Cylichna cylindracea Liiiu. 

 Dentalium hexagomim Sby. 

 Dentalium semipolitum B. & S. 

 Siplionodentalium 2)iisillum f Gabb. 

 CalUostoma annulatum Martyn. 

 Galerus Jilosus Gabb. 

 Crepidula navicelloides Nutt. 

 Turritella Jeivettii Cpr. 

 Bittium asperum Cpr. 

 Myurella simplex Cpr. 

 Driliia (four sp. imdet.). 

 Surcula Carpenter iana Gabb. 

 Mangilia variegata Cpr. 

 Mangilia (four sp. undet.). 

 ClathureUa Conradlana Gabb. 

 Odostomia straminea Cpr. var. 

 Odostomia sp. 



Turhonilla torquata Cpr. 

 Eulima rutila Cpr. 

 Scalaria subcoronata Cpr. 

 Cancellaria (four sp. uudet.). 

 Neverita Eeciuziana Petit. 

 Sigaretus dehilis Gkl. 

 Banella Mathewsonii Gabb. 

 OUvella hoetica Cpr. 

 Nassafossata GUI. 

 Astyris tuberosa Cpr. 

 Astyris sp. 

 Ocinehra lurida Cpr. 

 Pteronotus festivits Hds. 

 Trophon orpJieiis Gld. 

 OoZks Dupetithonarsi? Kien. 

 Voluto2)sis (sp. uudet.). 

 Chrysodomus Diegoensis Dall. 



About ten miles northward from San Diego, on the seacoast of Cali- 

 fornia, are beds of coarse sandstone, of considerable thickness, dipping 

 to the northward. About twenty feet of it (stratum C) are fossiliferous, 

 containing the shells, not aggregated in a confused mass, as in some other 

 cases above mentioned, but distributed much as they might have been 

 while living. According to Mr. Hemphill, these fossils have not the 

 aspect of an estuary deposit, but rather that of animals living in the 

 open sea. Pecten expansus occurring in both the well (B^) formation and 

 this sandstone, Mr. Hemphill supposes that they may be of identical 

 age, but that the different assemblage of species may be due to the one 

 being formed in an estuary and the other on an open coast. This sand- 

 stone bed contained, among others, the following species: — 



Ostrea VeatcML 

 Lucina acutilineata. 

 Opalia anomala. 

 Opalia varicostata. 

 Scalar i a tincta. 

 Scalaria HempMUii 



Pecten islandicus. 

 Pecten hericeus. 

 Pecten ventricosus. 

 Pecten expansus. 

 Pecten Stearnsii. 

 Pecten HempMUii. 

 Pecten cequisulcatiis var 



Adjoining bed C, and composed of recent alluvial soil, eight or ten 

 feet above tide-water, is another stratum (D), in which the specimens 

 are in a poor state of preservation, and nearly all found living near Saa 

 Diego at the present time. This bed afforded, — 



Laqueus cahfornicus. i Axinea profunda. 



Cumingia californica. Acmcea mitra. 



Tapes staminea. Acmwa insessa. 

 Lucina acutilineata. Fissurella volcano. 



