104 MEMOIRS OF THE CARNEGIE MUSEUM 



Bridger and Washakie Basins and with other deposits elsewhere." If this be the 

 true condition, it may to some extent account for the presence of many species 

 common to the two formations. 



Below is given a list of the identified species occurring in each of the three 

 subdivisions of the Uinta formation. 



Horizon A (Lower Uinta). 

 Baena inflata sp. no v. 



Horizon B (Middle Uinta). 



Baena arenosa Leidy, E. hollandi sp. nov., 



B. emilice Hay, E. uintensis Hay, 



B. inflata sp. nov., Hadrianus utahensis sp. nov., 



B. platyplastra sp. nov., Testudo uintensis sp. nov., 



B. gigantea sp. nov., Amyda egregia Hay, 



Echmatemys callopyge Hay, A. scutwnantiquum (Cope). 



Horizon C (Upper Uinta). 



Baena emilice Hay, Hadrianus corsoni (Leidy), 



Echmatemys douglassi sp. nov., H. robustus sp. nov., 



E. depressa sp. nov., Anosteira ornata Leidy, 



E. obscura sp. nov., Amyda sp., 



E. pusilla? Hay, Glyptosaurus sp. indet. 



Six genera and twenty species are recognized in the present collection, whereas 

 in 1908, at the time Doctor O. P. Hay published his "Fossil Turtles of North 

 America" only four genera and five species were accredited to the Uinta formation. 

 These were as follows: 



Baena emilice Hay, Hadrianus tumidus Hay, 



Echmatemys callopyge Hay, Amyda crassa Hay. 



E. uintensis Hay, 



The two latter species have not been recognized in the present collection, 

 although each of the others is represented by from two to six individuals, so that 

 altogether six genera and twenty-two species of fossil turtles have now been 

 found in the Uinta formation. The known geological range of these species is 

 graphically shown in the accompanying table. 



