628 GEOLOGICAL SURVEY OF THE TERRITORIES. 



Measurements. 

 No. 1. 



M. 



Widtli plastron at axilla . .•. 0. 0d6 



Leugth plastron from axilla, (approximate) 05 



Thickness byosternal at mesosterual 009 



Thickness hyosternal at hyposternal 0065 



Width mesosternal 037 



Length mesosternal 026 



Thickness of a vertebral 006 



Thickness of xiphisternal, (normal) 004 



Thickness of xiphisternal at i^ubis 007 



No. 2. 



Thickness 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 Eiver formation near Evanston, Wyoming. 



Emys euthnetus, Cope, sp. nov. 



Eepreseuted by numerous portions of several specimens. These per- 

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

 coclemmys pahistris.. There is no dorsal keel, and the scutal sutures, 

 though distinct, are not very much impressed, nor the interspaces swol- 

 len. 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 su- 

 tures of the bones coarse, and at the hypoxii^histernal junction, &c,, 

 with gomphosis. (It is fine and close at this i3oint in U. testudineus.) 



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

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

 tal bone. Surfaces smooth. 



Abundant in the red beds which lie between those of the Green Eiver 

 and Bridger epochs at Black Buttes, Wyoming. 



Emys megaulax. Cope, sp. no v. 



Eepresented by remains of two specimens. They pertained to ?« spe- 

 cies of about the size of that last described. The marked peculiarity 

 consists in the broad and abruptly sunken sutures which separate the 

 dermitl scuta of the carapace. This is visible on vertebral, costal, and 

 marginal bones, where the arese between the sutures are abruptly sep- 

 arated. The sutures partially interrupt the dorsal carina. This is 

 wide and low. The sculpture is otherwise smooth. The scutal sutures 

 are not so impressed on the plastron, and those of the gular scutes ex- 

 tend on the mesosterual bone. 



Measurements. 



M. 



Length of a marginal 016 



Width of a marginal 023 



Width of a vertebral 018 



Length of a vertebral 017 



