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 is 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 excavated to form a thoracic cavity. Posteriorly the epiplastra were 

 greatly reduced in thickness, nowhere along the hyoepiplastral suture exceeding 1 1 mm. The 

 bone thins gradually to the free border, so that the hinder part of the epiplastron differs con- 

 siderably from that of T. 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 gives it as 240 mm., but he measures to the middle of the inguinal notches. The length, 

 to the 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 1 1 

 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 atascosae Hay. 



Figs. 627-628. 



Testudo atascostr, Hay, Proc. Acad. Nat. Sci. Phila. 1902, p. 383, figs. 1-5. 



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 

 suggested that it may have been derived from Dr. Leidy's collection; we know also that Mr. 

 G. W. Marnock collected in Atascosa County, Texas, for Professor Cope, but beyond this 

 there 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 the 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 1 10 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 



