138 THE VVASATCU ANDBRIDGER FAUN^. 



The carapace is of moderate thickness, and the capitula are robust, 



much more so than in the E. shaughnessiana. The anterior marginals are 



robust; a posterior is much more thickened inferiorly, and is consequently 



more recurved than in E. sliaughnessiana, and displays narrower marginal 



scuta. 



Measurements. 



H. 



Lonpth of third vertcliral bono -.045 



Widtb of third vert*3brul bono 0;«) 



I.iMiRlli of third vcrtcbr.il scute 080 



Width of third vertebral scute 056 



Thickness of third mar(;iiml bone on suture for second 021 



Thickness of plastron at middle of hypostcrnal 017 



Width of anterior lobe at axilla 140 



This specimen resembles the one observed by Dr. Leidy, in having the 

 fourth vertebral bone octagonal, a character I have not met with in any 

 other species. 



EmYS LATILABIATUS Cope. 

 Proceedings of American Philosophical Society, 1872, p. 471. 



Represented by a perfect specimen of a tortoise of a broadly oval form, 

 and somewhat terrestrial habit. Its prominent characters are to be seen in 

 the plastron, of which the posterior lobe is deeply bifurcate. The anterior 

 lobe is peculiar in the unusual width of the lip-like projection of the clavic- 

 ular ("episteinal") bone, which is twice as wide as in E. wyomingensis, and 

 not prominent. Bones all smooth ; margins of lobes of plastron thickened. 



There are three scans, perhaps, of muscular insertions near the posterior 

 margin of the plastron, one oval one opposite to each lobe, and one round 

 one opposite to the notch. 



As compared with E. septarius this species has no such septa nor sculp- 

 ture ; the emargination of the plastron is more open, and the lip much shorter 



and wider. 



ifeasurements. 



K. 



Len;;th of earn|iace 255 



Width of carapace 2.')0 



Width of lip of [ilastron 06 



Depth of posterior notch 02 



The temporary misplacement of the typical specimen of this species 

 prevents my giving other than my original description. 

 From near Black's Fork of Green River. 



