GILMORE: the fossil turtles op the UINTA FORMATION 135 



The area of the first costal scute is much reduced, but it is still in contact with the 

 first vertebral. Supernumerary costals are not unusual in the Baenida?, though 

 I am not aware of their having been found before in the genus Echmatemys. When 

 present, they are usually confined to one side, seldom are they symmetrically paired 

 as in the present specimen. 



The plastron is exceedingly thick and heavy. At the center it measures 30 

 mm. in thickness. Though much of the anterior and posterior lobes are missing 

 the impressions remaining in the matrix show the plastron to have had a greatest 

 length of about 315 mm. 



The entoplastron though only partially preserved, has a greatest width of 50 

 mm. Its length cannot be determined. 



The bridge has a width of about 145 mm. 



There is no suggestion of a notch in the posterior lobe, shown by the im- 

 pression in the matrix, but it is not possible to state positively that such did not 

 exist. Judging from the impression left by the anterior lobe the lip was thick and 

 broad, with an abrupt depression on the dorsal surface some 35 mm. posterior to 

 the anterior border. The anterior end of this lobe was probably within the forward 

 end of the carapace. 



The pair of horn-like protuberances on the front of the carapace, the presence 

 of a pair of supernumerary costal scutes on either side of the first vertebral serve to 

 distinguish this specimen from all other described species of the genus, and I 

 therefore take great pleasure in naming it Echmatemys hollandi for Dr. William J. 

 Holland, Director of the Carnegie Museum, in recognition of his activities in the 

 field of vertebrate paleontology. 



10. Echmatemys obscura sp. nov. 

 Plate XXIV; text-figs. 14 and 15. 



Type: C. M. No. 3252, consisting of a carapace, lacking the posterior end 

 back of the sixth neural; and the plastron, lacking the lip and a small portion of 

 the extremity of the posterior lobe. Collected by Earl Douglass, August 17, 1908. 



Locality : Devil's Play Ground, south of Kennedy's Hole, Uinta Basin, Uinta 

 County, Utah. 



Horizon: Horizon C, "gray beds below red and gray beds," Uinta formation, 

 Upper Eocene. 



Except for the parts missing from the posterior end of the carapace, the type 

 specimen is well preserved and all of the sutures and sulci are clearly displayed. 

 The carapace is broadly rounded in front with a wide, but shallow, emargination of 



