134 THE WASATCH AND RKIDGER FAUN^. 



Abundant in the red beds wliich lie between tlinse identified as belong- 

 ing to the Green River and Bridger epochs at Black Buttes, Wyoming. 



Emys testudinea Cope. 



AoDaal Report U. S. Geol. Snry. Terrs., Hayden, 1672, p. 627, Xotomorpha testudinea Cope. Proceed. Amer. 



Philos. See, 1872, p. 475. 



Plate XXIII, figs. 12-13. 



Represented by portions of four or more individuals. In one of these 

 the anterior lobe of the plastron is in part preserved. The mesosternum is 

 a transverse oval, the posterior margin regularly convex, the anterior with 

 three equal borders. The median of these is concave. The sutui-es are 

 radiating, and the groove separating the humeral scuta, appears to traverse 

 the entire length of the bone. The outer surfoce is gently convex. The 

 free margin of the episternal and hyposternal bones is acute, and with an 

 internal thickening, as in Cisindo, Testudo, dr., forming a ridge with abrupt 

 inner face. This face extends backwards as a groove, to the axillary process 

 of the hyosternal, forming a characteristic mark. Although the extremity 

 of the episternal bone is lost, and the mesosternal exhibits no trace of tiie 

 intergular scute, the outer sutures of the gular scuta are so far posterior as 

 to render it highly probable that the intergular plate existed. At the point 

 where this suture reaches the margin, the latter is openly emarginate. The 

 posterior suture of the humeral suture crosses the margin half way between 

 the axilla and the episternal suture, and is not marked by a notch. The 

 last-named suture is transverse. On the xiphisternal bones the groove of 

 the anterior suture of the anals is plainly visible. It is regularly convex 

 forwards, and in one specimen is double. 



In a second specimen of about the same size, parts of two costal bones 

 are preserved They are thick, and display the usual costal and vertebral 

 scute-sutures, the latter in a groove; for the middle of the vertebrals is ele- 

 vated, and the costals project shoulder-like just outside the groove. 



In a third specimen a little larger, xiphisternals with several marginals 

 are preserved. A free po.sterior marginal is regularly recurved, and the 

 scute-sutures are deeply impressed. The margiiuil scuta have evidently 

 been marked with concentric grooves within their margins. The first mar- 

 ginal bone of the bridge has a very obtuse edge. 



In nono of the specimens are the surfaces sculptured. 



