PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



29 



Cylichna cylindracea Linn. 

 Dentalium liexagonum Sby. 

 Dentalium semipolitum B. & S. 

 iSijyhonodentalktmpusillum ? Gabb. 

 CalUostoma annulatum Martyn. 

 Galerus filosus Gabb. 

 Crepidula navicelloides Nutt. 

 Turritella Jeivettii Cpr. 

 Bittium asperum Cpr. 

 Myurella simplex Cpr. 

 BrilUa (four sp. undet.). 

 Surcula Carpenteriana Gabb. 

 Mangilia variegata Cpr. 

 Ilangilia (four sp. undet.). 

 Clathurella Conradiana Gabb. 

 Odostomia straminea Cpr. var. 

 Odostomia sp. 



Turhonilla torquata Cpr, 

 JEulima rutila Cpr. 

 Scalaria subeoronata Cpr. 

 Cancellaria (four sp. uudet.). 

 Neverita Recluziana Petit. 

 Sigaretus debilis Gld. 

 Banella Matheivsonii Gabb. 

 Olivella hoetica Cpr. 

 Nassafossata Gld. 

 Asfyris tnherosa Cpr. 

 Astyris sp. 

 Ocinehra lurida Cpr. 

 Fteronotus festiviis lids. 

 Troplion orpheus Gld. 

 Colus DupetWionarsi? Kien. 

 Volutopsis (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: — 



Pecten islandicus. 

 Pecten hericeus. 

 Pecten rentricosns. 

 Pecten expansus. 

 Pecten Stearns H. 

 Pecten HempMUii. 

 Pecten ivquisulcatus var 



Ostrea Veatcliii. 

 Lucina acutilineata. 

 Opalia anomala. 

 Opalia varicostata. 

 Scalaria iincta. 

 Scalaria HempMUii 



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

 feet above tide-wafer, 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, — 



Laqucus californicus. 

 Cumingia californica. 

 Tapes staminea. 

 Lucina acutilineata. 



Axinea profunda. 

 Acmwa mitra. 

 Acmcea insessa. 

 Fissurella volcano. 



