464 FOSSIL TURTLES OF NORTH AMERICA, 
The vertebral scutes are wide and strongly angulated where their lateral boundaries join 
the intercostal sulci. The first is 130 mm. wide anteriorly and 70 mm. wide behind. The others 
have a maximum width of about 130 mm. 
The plastron was described and figured by Cope. His drawing 1s here reproduced (fig. 625). 
When in Cope’s hands the epiplastral lip was present, but this is now missing. The length of 
the plastron is given by Cope as 365, mm. This included the extremities of the hinder lobe on 
each side of the notch. The anterior lobe has a width of about 180 mm. and, according to 
Cope, a length of 89 mm. Cope states that the epiplastral lip had a simple regularly rounded 
outline, which was distinctly set off from the rest of the anterior border. From his description, 
confirmed by the impression on the matrix, the lip, at the symphysis, thickened rapidly back- 
ward on the upper surface. A section along the symphysis would closely resemble that of T. 
laticaudata. The thickness reacht was, according to Cope, 27 mm. The width of the lip at 
the base was 90 mm.; the length on the midline of its upper surface, 40 mm. The hinder face 
of the thickening was excay ae to form a thoracic cavity. Posteriorly the epiplastra were 
greatly reduced in thickness, nowhere along the hy oepiplastral suture exceeding 11mm. The 
bone thins gradually to the free border, so “that the hinder part of the epiplastron differs con- 
siderably from that of 7. laticaudata. 
The entoplastron was of hexagonal form, about 60 mm. long and 80 mm. wide. The 
bridge has a width of 180 mm. The width of the hinder lobe may be regarded as 200 mm. 
Cope g gives it as 240 mm., but he measures to the middle of the inguinal nofeles: The length, 
to he extremities of the hinder angles of the xiphiplastra, is 100 mm. The notch behind is 
about 80 mm. wide. 
The gular scutes extended well backward on the entoplastron. The humerals extend 11 
mm. behind the entoplastron, on the midline. The pectorals join at the midline a distance of 22 
mm.; the abdominals, a distance of 120 mm.; the femorals, a distance of 42 mm.; the anals, 
a distance of 40 mm. 
The free border of the xiphiplastron is acute from the hinder angle to near the hypoxiphi- 
plastral suture. As the latter is approacht the bone thickens to 25 mm. and the free border 
becomes obtuse. 
Cope states this species may belong to the genus Gopherus (Xerobates), but this can not 
be settled before the skull is found. 
Testudo atascosze Hay. 
Figs. 627-628. 
Testudo atascose, Hay, Proc. Acad. Nat. Sci. Phila. 1902, p. 383, figs. 1-5. 
, 902, P- 393, ng: 5 
In the collection of the Academy of Natural Sciences of Philadelphia the writer has found 
certain bones which belong apparently to an undescribed species of the genus Testudo. These 
bones are accompanied by a label to this effect: ‘‘ Miocene, E. W. Marnock, Atascosa County, 
Texas.’”’ There is no record of how this material came to the Academy. Mr. Witmer Stone has 
pees that it may have been derived from Dr. Leidy’s collection; we know also that Mr. 
W. Marnock collected in Atascosa County, Texas, for Professor Cope, but beyond this 
ae is no indication that these bones were ever in the hands of either Professor Cope or Dr. 
Leidy. The initial ““E” in the name above given is probably an error for G. 
These remains consist of the left half of ele anterior lobe of the plastron and the greater 
portion of the left side of the hinder lobe. Figures of these parts are presented (figs. 627, 628). 
The species was one of considerable size. The xiphiplastron had a length of about 110 mm., 
the whole posterior lobe a length approximately of 120 mm. The anterior lobe had about the 
same length. We may perhaps safely estimate 200 mm. for the length of the bridge, thus mak- 
ing the plastron 440 mm. long. 
The anterior lobe (fig. 627) was close to 200 mm. in width. The entoplastron had a width 
of 100 mm.; its length was probably about 80 mm., but its hinder border is missing. The 
gular scutes encroach on its anterior border. A broad rounded lip projected beyond the gulo- 
humeral sulci about 28 mm. It had a width of 80 mm., and is not notcht in front. The whole 
border of the anterior lobe is acute, thru the beveling off of the upper side. Figure 627 repre- 
sents a section thru the lip at the midline and shows this beveling. The greatest thickness at 
