340 



FOSSIL TURTLES OF NORTH AMERICA. 



Measurements. 



Meter. 



Length of carapace - 2 55 



Width of carapace 250 



Width of lip of plastron .060 



Depth of posterior notch .020 



The temporary misplacement of the typical specimen of this species prevents my giving other 

 than mv original description. 



From near Black's Fork of (ireen River. 



This species was obtained in horizon B ol the Bridget' Eocene. 



Echmatemys callopyge sp. nov. 

 Plate 52, figs. 1,2; text-figs. 447, 448. 



As type of this species the American Museum of Natural History possesses a large and 

 complete shell, No. 2087. It was collected in the year 1895, in the middle Uinta deposits neat- 

 White River, Utah. 



The shell is slightly crusht over toward the left side, a part of the right side is broken in, 

 and a portion of the left margin is somewhat damaged; but there is nothing to prevent the 



447- 



Figs. 447 and 448. Echmatemys callopyge. Carapace and plastron ot type. XA- 

 447. Carapace. 448. Plastron. 



determination of all the external characters that the shell offers. It would require the inflicting 

 of much injury on the specimen to reach and examine the axillary and inguinal buttresses. 

 I [ence their condition is not certainly known. 



The form ot tin- carapace (plate 52, fig. 1; text-fig. 447) is elongated oval, rounded in 

 front and pointed behind, with the median portion high and vaulted. The plastron is broad 

 and it left but little space for the exit of the limbs. 



I he length ot the carapace, in a straight line, is 438 mm.; its width is 270 mm.; its height 

 is now 153 mm. The latter dimension was doubtless somewhat greater during the life of the 

 animal. There is a rather broad elevation running along the midline of" the first vertebral 

 scute and another on the last vertebral; elsewhere there is no indication of any carina. The 

 margin of the carapace behind the inguinal notches is thin and comes to a sharp edge. This 



