NEOCENE STRATIGRAPHY. 



333 



cies in the fossil fauna eighteen in the present fauna of 

 the same region, or 57%. 



The southern character of the fauna is very noticeable. 

 Several of the living species are known only in more 

 southern waters, and some of the extinct forms, as the 

 Area microdonta Conrad, are related to forms found only 

 south of this region. 



TABLE OF FOSSILS OF UPPERMOST BEDS OF 

 MEKCED SERIES. 



Is 



o ^ 



jih td 



Wg 

 ft. £. 



*^ ti 



o p 



Astyris gausapata Gould 



Bittium armillatum Cai'penter 



Cardium corbis Martyu 



Cardium quadragenarium Conrad ?..... 



Chioue succiucto Valencieunes 



Columbella richthofeni Gabb 



Crepidula navicelloides Nuttall 



Crytomya calif ornica Conrad 



Drillia incisa Carpenter 



Drillia penicillata Carpenter 



Macoma edulis Nuttall 



Macoma nasnta Conrad 



Monoceras engonatum Conrad 



Mytilus edulis Linnseus 



Nassa californica Conrad, var 



Nassa fossata Gould 



Nassa mendica Gould 



Neptunea recurva Gabb? 



Olivella biplicata Sowerby 



Oliyella intorta Carpenter 



Ostrea sp. ind 



Placunanomia macroschisma Deshayes. 



Psephis lordi Baird 



Purpura canaliculata Duclos ? 



Purpura crispata Chemnitz 



Purpura saxicola Valeucdennes 



var. ostriua ? Gould 



Saxidomus gracilis Gould 



Schizothoeris nuttalli Conrad 



Standeila californica Conrad 



Tapes staminea Conrad 



Echinarachinus excentricus Escholtz . . . 



