so SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 



PREHISTORIC FUANA OF CALIFORNIA. , 



PLATE 4. 



Tertiary Fossils described by Dr. L. G. Yates, and by Thomas 

 Conrad. t 



53. Pinna alamedensis, L. G. Yates. Miocene. The type speci- 



men from which this species was described was dis- 

 covered by the writer in a Miocene boulder in Alameda 

 • County, California, and was nearly twice as large as 

 the specimen figured, which was found in Kern County, 

 in rocks of Pliocene age. Dr. Cooper says of this shell : 

 "Yates' type was nearly twice as long as this, and com- 

 plete in form."* 



54. Pinna venturensis, L. G. Yates. "Pliocene. Three-fourths 



the size of largest found, and with fewer ribs. Ven- 

 tura County, California. 

 55-56. Pecten discns, Conrad. Pliocene. Kern County, Cali- 

 fornia. 



*i. Report of State Mineralogist of California for 1887, page 2Sg. 

 *Bulletin No. 4. California State Mining Bureau, 1894, page 65. 



