WHITE ON PALEONTOLOGY. 



6,11 



TERTIARY PERIOD. 



■U^AHSATCH GROUP. 



Viviparus pUcapressus White. 

 Yiviparus ionicus White. 

 Yiviparus trochiformis Meek and 



Hay den.* 

 Viviparus paludinccformis Hall.t 

 TuJotoma thompsoni White. 

 BytkineUa utaliensis White. 

 Bythinella recta White. 

 Goniohasis tenera Hall.t 

 Gojiiohasis f ici/oniingensis Meek. 

 Goniohasis nehraseensis Meek and 



Hayden.* 

 Goniohasis tenuicarinaUts Meek and 



Hayden.* 

 CassiopeUa turricula White. 

 Neritina volvilineata White. 

 Helix peripheria White. 

 PJiysa pleromatis White. 



Linmcca {Limnophysa ?) compacfilis 



Meek. 

 Planorhis utahensis Meek.t 

 Corhula suhundifera White. 

 Corbula crassitilliformis Meek. 

 Corhicula hannisteri Meek. 

 Corhicula {Leptesthes) fracta Meek. 

 Pisidium saginatum White. 

 Unio couesi White. 

 JJiiio prophetiGus White. 

 Unio proavitus White. 

 Unio hracliyopistlms White. 

 Unio holmesianns White. 

 Unio endlicM White. 

 Unio mendax White. 

 Ostrea icyomingensis Meek. 

 Ostrea arcuatilis Meek. 



GKEEN EIYER GROUP. 



Viviparus paludinwformis Hall.§ 

 Goniohasis tenera Hall.§ 

 Bythinella gregaria Meek. 

 Pupa incolata W^hite. 

 Pupa arenula White. 

 Helix riparia White. 

 Helix peripheria White. 



Succinea papillispira White. 

 Limmca vetusta Meek. 

 Limmm siinilis Meek. 

 Planorhis utahensis Meek.§ 

 Unio washaMetisis Meek. 

 Unio shoshonensis White. 



BRIDGER GROUP. 



Viviparus 2}alHdinafor)nis Hall.§ 

 Viviparus icyomingensis Meek. 

 Goniohasis tenera Hall.§ 

 Pupa .** leidyi Meek. 



Physa hridgerensis Meek. 

 Planorhis utahensis Meek.§ 

 Unio haydeni Meek. 

 Unio meeld White. 



* Originally discovered in the Fort Union group, but identified in strata probably 

 equivalent with the ^Yahsatch group of Eastern and Central Utah. 



t This species ranges, with slight variations, through all the fresh-water deposits of 

 the Wahsatch, Green River, and Bridger groups, and is regarded specifically identical 

 with U. niH'dahUis Meek. 



* This species ranges from the beginning of purely fresh- water deposits in the Wahsatch 

 group and up through the Green River and Bridger groups iuclusive. G. nodulifer 

 Meek, G. carteri Conrad, and G. simpsoni Meek are all believed to be identical with 

 G. feuera Flail. 



^ See foot-notes on page 010. 



Gbh 



