342 FOSSIL TURTLES OF NORTH AMERICA. 
The very narrow first vertebral scute distinguishes this species from all others, especially 
from E. uintensis, which also comes from the Uinta formation. From many species it is dis- 
tinguisht by the rather broad vertebrals succeeding the first. The narrow epiplastral lip and 
the longitudinal ridge on the upper side of the symphysis are peculiarities. The femoral 
scutes are unusually narrow at the midline. The species resembles somewhat FE. septaria 
(Cope), but the vertebral scutes of the two are different, and the epiplastron of E. callopyge 
appears not to have been so greatly thickened as in E. se ptarta. 
Echmatemys uintensis sp. nov. 
Plate*s3), figs. 1,2. 
In the paleontological collection at Princeton University there is a fine, large shell of a 
species of Echmatemys which was collected in 1895, by Mr. J. B. Hatcher, in the middle 
Uinta formation, on White River, Utah. It bears the catalog number 11198. This shell is 
practically complete and but little crusht. The total length, in a straight line, is 460 mm.; 
the width, 295 mm.; the height above the bottom of the plastron, 160 mm. In outline the 
carapace is somewhat concave in front, rounded behind. The hinder peripherals flare slightly 
upward, 
On the nuchal bone and the anterior neurals there is a slight ridge; and this reappears and 
is more prominent on the hinder third of the shell. 
The nuchal bone is 67 mm. long and 107 mm. wide. It is excavated behind for the first 
neural. The neurals are relatively broad, the second, third, and fourth hexagonal; the fifth 
octagonal, joining the fourth, fifth and 
Dimensions of neurals. Dimensions of vertebral scutes. sixth costals; the sixth and seventh 
: ey Paths broadly hexagonal; the eighth nearly 
No. Length.| Width. | No. | Length. |. sae ata quadrate. The table shows the dimen- 
: = 2 ee sions of the neurals. 
The first suprapygal is 37 mm. long, 
1 60 45 1 70 112 1 : 3 : 
2 43 2 2 115 80 102 21 mm. wide in front, and 42 mm. wide 
3 5° 42 | 3 oO eg ws posteriorly. The second is 47 mm. long 
4 5° 430) 4 78 75 4 : : 
: a4 47 ° 86 | 43 142 and 115 mm. wide. 
6 30 42 The first peripheral has the free edges 
aN i | perip ge 
if so | moderately acute, but toward the axil- 
me a | | lary notch the others become obtuse. 
All these rise above the free margin about 
60mm. The eighth peripheral is 67 mm. high. The pygal is 42 mm. wide and 38 mm. high. 
The vertebral scutes are longer than wide with the sides nearly straight, except where the 
sulci dividing the costal scutes are given off. The dimensions of these scutes are given above. 
The anterior suprapygal is 37 mm. long, 21 mm. wide in front, and 41 mm. behind. The 
second suprapygal is 49 mm. long, 105 mm. wide across the middle, 33 mm. where it joins the 
pygal. The hinder boundary of the fifth vertebral scute lies on the second suprapygal. 
The axillary and inguinal buttresses rise high within the carapace, but the details are not 
known. They extend at their bases but a short distance inward beyond the free borders of 
the plastron. 
The anterior lobe of the plastron is 120 mm. long and 200 mm. wide at the base. From 
the axilla the width decreases slowly to just beyond the hyoepiplastral suture, then more 
rapidly by a sigmoid curve to the lip. The latter is 65 mm. wide and truncated. It projects 
little beyond the ends of the gulo-humeral sulci. As seen from below, it is convex from side to 
side; as seen from above, concave. The thickened portion of the lip continues backward 
30 mm.; and behind it the thickness is not greatly reduced. The free border of this lobe 1s 
acute. On the upper surface of the bone the horn-covered surface is 23 mm. wide. 
The entoplastron is diamond-shaped, 70 mm. long and g5 mm. wide. 
The hinder lobe is 150 mm. long and 200 mm. wide at the base. The notch in the hinder 
end is 16 mm. deep and 55 mm. wide. The border of the lobe is acute. Seen from above, the 
beveled surface is 37 mm. wide at the hypoxiphiplastral suture; at the femoro-anal sulcus 
only 15mm. At the inner border of the bevel the thickness is 20 mm. 
