TESTUDINATA. 135 



Measurements. 



No. 1. M. 



Width of plastron at axilla 086 



Length of plastron from axilla (approximate) 05 



Thickness of hyostemal at mesosternal 099 



Thickness of hyostemal at hypostemal 0005 



Width of mesosternal 037 



Length of mesosternal ^ t 026 



Thickness of a vertebral 006 



Thickness of xiphisternal (normal) 004 



Thickness of xiphisternal at pubis 007 



No. 2. 

 Thickness of costal at hump 0075 



Width of costal 0175 



No. 3. 



Width of posterior marginal 027 



Length of posterior marginal 019 



The mesosternal, though found with No. 1, does not fit it exactly and 

 does not belong to it. 



From Green River formation near Evanston, Wyoming. 



Ejtts vyomingensis Leidy. 



Annual Report U. S. Geol. Surv. Terrs., Hayden, 1871, p. 367, Montana. Proc. Acad. Phila., 1869, p. 66. 

 E. stevensonianus Leidy, loc. cit,, 1870, p. 5, fide Leidy. E. jeanesi Leidy, loc. cit., 1870, p. 123, fide 



Leidy. 



Plate XXIII, figs. 9-11. 



Of this, the most abundant tortoise of the Bridger Eocene, I obtained 



numerous specimens on my expedition of 1872. I refer especially to three 



as most characteristic, one a chelonite entire, but with plastron crushed in; 



a second broken up, but including portions of most of the shell; and, 



tliirdly, a nearly perfect plastron. These all show that the species had no 



intergular scute, as finally decided by Leidy. They also show that the 



notch on each side of the lip of the plastron is not uniformly present. As 



Dr. Leidy has given a very full account of this species, with good figures,* 



I do not redescribe it here, but refer to it in the descriptions of the allied 



species. 



Emys shaughnessiana sp. nov. 



Plate XXIII, figs. 3-6. 



I describe under this name a species, which is represented by the 

 greater part of one individual in a dislocated condition. The separated 

 elements are in excellent preservation, so that the characters can be readily 

 ascertained. 



'Report U. S. Geol. Surv. Terrs., i, 1873, p. 140. 



