340 FOSSIL TURTLES OF NORTH AMERICA. 
Measurements. 
Meter. 
Length of carapace. 0.255 
Width of carapace ... d .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 my original description. 
From near Black’s Fork of Green River. 
This species was obtained in horizon B of the Bridger 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 near 
White River, Utah. 
The shell is slightly crusht over toward the left side, a part of the mght side is broken in, 
and a portion of the left margin is somewhat damaged; but there is nothing to prevent the 
Fics. 447 and 448.—Echmatemys callopyge. Carapace and plastron of type. X 4. 
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. 
Hence their condition is not certainly known. 
The form of the carapace (plate 52, fig. 1; text-fig. 447) 1s elongated oval, rounded in 
front and pointed behind, with the median portion high and vaulted. The plastron is broad 
and it lett but little space for the exit of the limbs. 
The length of 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 ts thin and comes to a sharp edge. This 
