Vor. IIT] 
SMITH—MIOCENE FOSSILS OF CALIFORNIA 167 
The following common and characteristic species range up 
from the lower Miocene, and become extinct in the San Pablo- 
Santa Margarita fauna: 
Arca microdonta Conrad 
Arca obispoana Conrad 
Chione temblorensis Anderson 
Cytherea diabloensis Anderson 
Modiolus multiradiatus Gabb 
Ostrea titan Conrad 
Panopaea estrellana Conrad 
Pecten andersom Arnold 
Pecten crassicardo Conrad 
Pecten discus Conrad 
Pecten estrellanus Conrad 
Trophon carisaensis Anderson 
The following characteristic species are confined to the San 
Pablo-Etchegoin fauna: 
Pecten pabloensis Conrad 
Astrodapsis antiselli Conrad 
Astrodapsis tumidus Remond 
Astrodapsis whitneyi Remond 
Tamiosoma gregaria Conrad 
The following species lived over from the lower Miocene, 
and became extinct in the Etchegoin: 
Mulinia densata Conrad 
Sigaretus scopulosus Conrad 
Zirphea dentata Conrad 
Trophon ponderosus Gabb 
The following characteristic upper Miocene species became 
extinct in the Etchegoin: 
Diplodonta harfordi Anderson 
Diplodonta parilis Conrad 
Glycimeris coalingaensis Arnold 
Modiolus directus Dall 
Mytilus coalingaensis Arnold 
Ostrea vespertina Conrad 
Ostrea atwoodi Gabb 
Pecten coalingaensis Arnold 
Placuanomia californica Arnold 
Thats ketilemanensis Arnold 
Turritella vanvlecki Arnold 
The following characteristic species range up from lower 
Miocene, and become extinct in the lower Pliocene, Purisima- 
San Diego fauna: 
Scutella gibbsi Gabb 
Arca trilineata Conrad 
Chione securis Shumard 
Trochita filosa Gabb 
Mactra albaria Conrad 
Marcia oregonensis Conrad 
Phacoides sanctaecrucis Arnold 
Thracia trapezoidea Conrad 
Venus pertenuis Gabb 
Chione staleyi Gabb 
Trochita inornata Gabb 
The following characteristic upper Miocene species range 
over into lower Pliocene, and become extinct in the Purisima- 
San Diego fauna: 
Astrodapsis perrint Weaver 
Scutella gibbsi Gabb var. ashleyt 
Arnold 
Arca canalis Conrad 
Cryptomya ovalis Conrad 
Cardium coosense Dall 
Cardium meekanum Gabb 
Macoma astori Dall 
Ostrea veatcht Gabb 
Pecten cerrosensis Gabb 
Pecten cerrosensis vat. menden- 
hallii Arnold 
Pecten nuttert Arnold 
Pecten owent Arnold 
Pecten wattsi Arnold 
Schizothoerus pajaroanus Conrad 
Chrysodomus imperialis Dall 
Chrysodomus portolaensis Arnold 
Miopleioma oregonensis Dall 
