328 



CALIFORNIA ACADEMY OF SCIENCES. 





o 



e 

 B 





s 



g 



a 

 O 



a 

 o 



O 



g 



w 



a 



Q 



g 

 trc! 



o 



p' 



1 



; 



* 



5' 



5' 



OQ 



o 



p 

 "^ 

 S 



1 



a 

 g 



Siliqua patula Dixon sp 





Soleu siccarius Gould 





* 



* 



'i 





9 

 * • 



* 





Standella californica Conrad 







Standella falcata Gould 









Standella nasuta Gould ? 















Tapes staminea Conrad 















Tapes tenerrima Carpenter 









* 





* 

 * 





*Venus pajaroeusis Conrad. 



* 



- 



« 





Yoldia cooperi Gabb 



S. 



Zirplioea crispata Liunpeus 















ECHINODERMATA. 



Scutella gibbsi Eemond 



Scutella interlineata Stimpson 









Relations of the Fauna. — We have fifty-two species, of 

 which eighteen are not known Hving and four are not 

 known in the present fauna of the same region. Or, 

 using the old method of percentages, we find 56% of the 

 fossil fauna in the living fauna. It is found that twent}^- 

 two of the above list have been found in strata whose Mi- 

 ocene age is not questioned, of which number five are 

 strictly Miocene. This would place these strata in the 

 upper Miocene or according to some authorities in the 

 lower Pliocene. But fortunately we can here use the 

 more modern method of comparison with known faunas. 

 We do not as yet feel safe in asserting the identity of any 

 of these species with those found in the Atlantic Miocene. 

 In many cases, however, the resemblance is so strong 

 that for all practical purposes we ma}^ assume them to be 

 of the same type and use them as though we felt sure of 

 their specific identity. 



* Eecently shown bj^ Dr. Merriman to be a Mactra. 



