144 THE WASATCH AND BKIDGER FAUNiB. 



belong to the same individual. The dermal sutural grooves are well 

 marked. There is a large intergular scutum, which evidently encroached 

 considerably on the mesosternal (a piece not preserved), and was probably 

 subtriangular in shape. The gulars are reduced to triangular areas on the 

 outer anterior angles, the suture with the humeral being in front of the 

 middle point between the angle and the hyosternal suture. The margin is 

 less distinctly emarginate at this suture than in Emys testudinea. 



The marginal bones belong to both bridge and free edge. They are 

 all much thickened medially, but with thin proximal sutural margins. The 

 free ones are Avell recurved, and with regular rather thickened margins. 

 The bridge marginals have very obtuse margins, Their general massive- 

 ness is in contrast to the thinness of the costals, of which there are numerous 

 fragments. Portions of vertebral bones are intermediate in thickness. 



There is no thickening or ridge on each side of the vertebral scuta. 

 The scutal grooves are everywhere well marked. The surface of the max-- 

 ginals and episternal is obsoletely rugose, somewhat as in some species of 

 Taphrosphys from the Cretaceous. 



The posterior marginal bones are stout and more thickened inferiorly 

 than those of the E. vyommgensis and E. shaughnessiana, and are more re- 

 curved. 



Measurements. 



M. 



Length of ppistenial (.approxiiii.ite) 04 



Length from posterior suture (approximate) to gular scute 02 



Thickness of episternal, behind CI 1 



Length of a marginal bone 042 



Width of same m.irgiunl bono 045 



Thickness of same marginal bono Ol,"! 



Width of a bridgi--inarginal 04 



Thicknetiss of a verbetrai 007 



From the Wasatch beds of Wyoming, si.x miles north of Evanston, 



near Bear River. 



BAENA Leidy. 



Geological Survey Wyoming, 1870, p. :J67. Survey Montana, 1871, p. 368. Report U. S. Geol. Sorr. 

 Terrs., Hayden, i, p. 160. Cope, Annual Ucport U. 8. Geol. Siirv. Terra., 1872 (1873), p. 621. Chit- 

 tmium Leidy, Proceed. Acad. Thila., 1872, p. 162. 



This genus agree with the Adocidce* in the presence of intergular scuta 

 and the absence of coossification of the ischium and pubis with the plastron, 



* Proceedings of the American Philosophicol Society, 1870, p. 547. 



