GILMORE: the fossil turtles of the UINTA FORMATION 123 



The few sulci discernible are narrow and delicately impressed. As ill pre- 

 viously described specimens the intramarginal sulci on the nuchal and anterior 

 peripherals cannot be traced. The first vertebral has a greatest width of 26 mm., 

 whereas in the specimen described by Hay it is only 18 mm. The sulcus forming 

 the posterior boundary of the first vertebral crosses the first neural as in other 

 described specimens. The costal sulcus on the second costal is near the center of 

 that bone, while in the specimen described by Hay it is very close to the posterior 

 border. 



The right hypoplastron is 21 mm. long on the midline, and has a thickness of 

 5.5 mm. The sculpture on the lower surface of this bone is made up of fine ridges 

 arranged in a radiating pattern. There is no evidence of epidermal scutes on any 

 of the plastral bones found with this specimen. 



Cope has recognized this species from the Upper Green River beds, so that the 

 evidence at hand shows that this species ranges from the lowest horizon in the 

 Bridger deposits to the highest horizon in the Uinta formation, the uppermost 

 Eocene. 



Family EMYDID.E Gray. 



Genus Echmatemys Hay. 



In 1908 Hay^ recognized nineteen species as pertaining to the genus Ech- 

 matemys. Since that time he has described one new form,'' so that with the four 

 new species described in the present paper, twenty-four species have been recog- 

 nized from the fossiliferous deposits of North America. Seven of these have now 

 been found in the Uinta formation and increased collections will doubtless show the 

 presence of several more. The discovery in the present collection of Echmatemys 

 septaria (Cope) leads to the belief that still other species known in the older 

 Wasatch and Bridger beds, will sooner or later be found to continue into the upper- 

 most Eocene. 



6. Echmatemys callopyge Hay. 



Plate XXI; text-figs. 9 and 10. 



Echmatemys callopyge Hay, Fossil Turtles of North America, 1908, 340-342, PL 



LII, figs. 1, 2; text-figs. 447, 448. 



Two specimens in the Carnegie Museum are identified as belonging to this 

 species. The better preserved specimen. No. 2371, was collected by Earl Douglass 

 in 1908, from Horizon B, "above second sandstone with small artiodactyls," 



* " Fossil Turtles of North America," 1908, p. 298. 



« Proc. U. S. National Museum, XXXV, 1908, pp. 164-166. 



