PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 29 



Cyliclma cylindracea Linn. 

 Dentalium hexagonum Sby. 

 Dentalium semipolitum B. & S. 

 Siphonodentalium pusillum f Gabb. 

 Calliostoma annulatum Martyn. 

 Galerus filosus Gabb. 

 Crepidula navicelloides Nutt. 

 Turritella Jewettii Cpr. 

 Bittium asperum Opr. 

 Myurella simplex Opr. 

 Drillia (four sp. undet.). 

 Surcula Carpenter iana Gabb. 

 Mangilia variegata Opr. 

 Mangilia (four sp. undet.). 

 Clathurella Conrad iana Gabb. 

 Odostomia straminea Opr. var. 

 Odostomia sp. 



Turbonilla torquata Opr. 

 Eulima rutila Opr. 

 Scalaria subcoronata Opr. 

 Cancellaria (four sp. undet.). 

 Neverita Recluziana Petit. 

 Sigaretus debilis Gld. 

 Ranella Matheivsonii Gabb. 

 Olivella boetica Cpr. 

 Nassafossata Gld. 

 Astyris tuberosa Cpr. 

 Astyris sp. 

 Ocinebra lurida Cpr. 

 Pteronotus festivus Hds. 

 Trophon orpheus Gld. 

 OoZws Dupelitlwuarsif Kien. 

 Yolutopsis (sp. undet.). 

 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 2 ) 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: — 



Pecten islandicus. 

 Pecten hericeits. 

 Pecten ventricosus. 

 Pecten expansus, 

 Pecten Stearnsli. 

 Pecten Hempliillii. 

 Pecten wquisulcatus var 



Ostrea VeatcJiii. 

 Lucina acutilineata, 

 Opalia anomala. 

 Opalia varicostata. 

 Scalaria tincta. 

 Scalaria Remphillii 



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 San 

 Diego at the present time. This bed afforded, — 



Laqueus californicus. 

 Cumingia californica. 

 Tapes staminea. 

 Lucina acutilineata. 



Axinea profunda. 

 Acmwa mitra. 

 Acmwa insessa. 

 Fissurella volcano. 



