124 



MEMOIRS OF THE CARNEGIE MUSEUM 



Uinta formation, Upper Eocene, east of Dragon- Vernal road between White and 

 Green rivers, Uinta Basin, Uinta County, Utah. The second specimen, No. 2157, 

 was also collected by Douglass from the same geological horizon near Well No. 2, 

 in the Uinta Basin. Like the type, both of these specimens have the carapace 

 somewhat crushed over toward the left side. The type of the species is said by 

 Hay to have come from the middle Uinta, and it appears probable that all of 

 these specimens were found at about the same geological level. 



Hay considered the very narrow first vertebral as the chief distinguishing 

 character for separating this species from the others of the genus, but both of the 



Fig. 9. Echmatemys callopyge Hay. Carapace of C. M. No. 2371. One-fourth natural size. c. S, 

 costal plate; c.s. 1, first costal scute; n. 1, and n. 8, neurals one and eight; n.p., nuchal plate; s.p., suprapygal. 



specimens before me have this scute relatively wider than in the type, although in 

 nearly all other respects, as is shown by the table of comparative measurements, 

 the specimens are remarkably similar. So far as the width of the first vertebral is 

 concerned these specimens are intermediate between the type of the present species 

 and the figured specimen of Echmatemys septaria (Cope), as illustrated by Hay, 

 Fossil Turtles of North America, Fig. 415, p. 320. The type of the latter species 

 is in the U. S. National Museum (No. 4088), and consists of a fairly complete 



