TESTUDINATA. 133 



Measurements. 



M. 



Length of a marginal 016 



Width of a marginal 023 



Width of a vertebral 018 



Length of a vertebral 017 



The vertebrals are subquadrate in fonn. Neither carapace or plastron 



are thick. The mesosternal is transversely diamond-shaped, and angular in 



front. 



Measurements of mesosternal. 



Length 023 



Width 034 



Other fragmentary specimens similar in size to the last, have the scutal 

 sutures strongly marked, but not so widely and deeply impressed. Though 

 they are finer, they interrupt the dorsal carina, which swells up from it, 

 and they divide the flat proximal portion from the much swollen marginal 

 part of the marginal bones. The mesosternal bone is similar in form to that 

 of the last specimens; the only specimen is obtusely rounded in front, and 

 bears part of the gular scuta. 



From the Wasatch or Green River beds at Black Buttes. A third but 

 uncharacteristic series of fragments from the first Eocene lignite bed above 

 the Cretaceous, probably belong to this species. 



Emys euthneta Cope. 



Annual Report U. S. Geol. Surv. Terrs., 1872, p. 628. 

 Plate XVII, figs. 34-42. 



Represented by numerous portions of several specimens. These per- 

 tained to a species of about the size of the salt-water terrapin, Malacoclemmys 

 palustris. There is no dorsal keel, and the scutal sutures, though distinct, 

 are not very much impressed nor the interspaces swollen. The lip of the 

 plastron is narrow, thick, and not notched; the sutures of the gular scales 

 do not extend on to the mesosternum. The margins of the lobes of the 

 plastron are a little thickened and the sutures of the bones coarse and at 

 the hypoxiphisternal junction, etc., with gomphosis. (It is fine and close 

 at this point in E. testudinea.) 



The costal sutures for the bridge are projecting and curved, in one 

 position; in the other, straighter, and very near the margin of the costal 

 bone. Surfaces smooth. 



