452 FOSSIL TURTLES OF NORTH AMERICA. 
a sharp carina passes backward over the bridge to the free border behind the inguinal notch. 
Possibly the acuteness of this has been accentuated by crushing. 
The plastron projects considerably in front of the carapace. This does not appear to be 
due to any crushing, for the hinder end of the plastron approaches closely the border of the 
carapace. 
The length of the carapace is 305 mm.; its width, 280 mm. All the free borders are acute. 
The nuchal has a length of 57 mm., a maximum width of 67 mm., and a width of 43 mm. along 
the free border. The first neural is oval, the second and fourth octagonal; the third, fifth, and 
eighth are 4-sided; the sixth and the sev venth, hexagonal. The table shows their dimensions. 
Dimensions of neurals. Dimensions of costals. Dimensions of vertebrals. 
; Proximal Distal = Width Greatest 
No. Length. Width. No. widths wide No. Length. Fe are Saree 
1 38 31 2 21 65 1 65 65 65 
z 35 5o 3 39 15 2 57 57 83 
3 28 43 4 22 58 ct 60 73 92 
4 35 55 5 28 37 4 63 7 83 
5 28 41 6 20 33 5 57 3 100+ 
6 18 50 7 17 26 | 
7 24 51 
8 26 26 
The etl places a are alternately wide and narrow at sheik eroanal ends and narrow and 
wide at their distal ends. The widths are given in the table above. 
The nuchal scute is 15 mm. long and 13 mm. wide. The dimensions of the vertebrals are 
herewith shown in tabular form. 
The plastron has a length of 325 mm., being thus longer than the carapace. The anterior 
lobe is 100 mm. long and 148 mm. wide at the base. The epiplastral lip is 70 mm. wide at the 
ends of the gulo- ee sulci and it projects beyond these a distance of 28 mm. The free 
borders of the lobe, including the lip, are acute. The anterior border of the lip is notcht. 
The thickening of the lip is ponenucd backward a distance of 45 mm. from the front; it then 
drops off suddenly, forming an escarpment, which is somewhat excavated beneath. At the hyo- 
epiplastral suture the width of the superior horn-covered surface is 27 mm. The entoplastron 
is 61 mm. long and 58 mm. wide. The bridge has a width of 150 mm. 
The hander lobe is 55 mm. long at the midline, 7o mm. total, and has a width of 155 mm. 
at the base. Median ee 15 mm. deep and 55 mm. wide. Near the inguinal notch the free 
border of the lobe is about 17 mm. thick; sore posteriorly it becomes thin and finally acute. 
The gular scutes are 60 mm. long in the midline. The humerals occupy 54 mm. of the 
midline; the pectorals, 24 mm.; the abdominals, g5 mm.; the femorals, 40 mm.; the anals, 
33mm. The axillary and inguinal scutes are present, but small. 
No. 1536 of the Carnegie Museum is a nearly complete shell, smaller than the preceding. 
It is referred to this species. It presents the difference of having a smaller epiplastral lip. 
No. 1570 of the Carnegie Museum is also referred to the present species. It was obtained 
in 1902, by Mr. Earl Douglass, at Cold Spring, Montana, in what the discoverer regards as 
Upper Loup Fork beds. 
The hinder parts of both carapace and plastron are wanting. The epiplastral lip does not 
project so much in front of the carapace as in the type, but this may be due to some distortion. 
The entoplastron is 52 mm. long and 60 mm. wide, differing thus somewhat from that of the 
type, whose entoplastron is longer than wide. Pectoral scutes 28 mm. wide at midline. 
The surtaces of this shell and those of the type are sculptured by the growth lines of the 
epidermal scutes. 
This species differs from 7. farr: in having the first vertebral scute much less expanded, in 
having the opposite ends of the costals more introwed and more widened, and the epiplastral 
lip more strongly developt. It differs from T. vaga in having a more projecting epiplastral 
lip, a differently shaped entoplastron and pectoral scutes narrower at midline. 
This species is dedicated to Dr. W. J. Holland, director of the Carnegie Museum, Pitts- 
burg, Pennsylvania. 
