308 



EOSSIL TURTLES OF NORTH AMERICA. 



his specimens. One of the new specimens, No. 6032, 215 mm. long and 175 mm. wide, 

 furnishes the shell complete, with the exception ol the proximal ends of some of the median 

 costals and parts of two neurals. No. 6042, 270 mm. long and 227 mm. wide, furnishes a 

 complete shell, but has the carapace crusht down on the plastron. No. 6043, somewhat smaller 

 than No. 6032, is a nearly complete shell, lacking only a part of the rear of the carapace and 

 the hinder extremity of each xiphiplastron. 



In No. 6032 the third neural is octagonal, whereas in No. 6042 it is hexagonal. In both 

 specimens the fifth is octagonal, the hinder angles being in contact with the sixth costals. In 

 No. 6032 the sulci bounding the vertebral scutes are deeply sunken, and in many places these 



sulci are bordered by crimpt ridges. In No. 

 6043 also, all of the sulci are deeply sunken and 

 included between ridges of the hone. 



The vertebral scutes have their sides more 

 or less bracket-shaped. The dimensions of 

 those of Nos. 6032 and 6042 are given in the 

 accompanying table. 



The anterior lobe of No. 6032 is 52 mm. 

 long and 96 mm. wide at the base. The epi- 

 plastral lip is 40 mm. wide. Its anterior border 

 is excavated somewhat, but in the other specimens it is truncated. The upper surface of the 

 lip is concave from side to side. The horn-covered areas of the upper surface of this lobe are 

 narrow. In all the specimens the entoplastron is wider than long. It is not crost by the 

 humero-pectoral sulcus, altho in No. 6042 this sulcus skirts its posterior border. The bridge 

 of No. 6032 is 80 mm. wide. The hinder lobe has a length of 68 mm. and a width of 94 mm. 

 at the base. The notch in the rear is large, 45 mm. wide and 17 mm. deep. 



No. 6043 presents the interior surfaces of carapace and plastron. The bases of the axillary 

 and the inguinal buttresses extend inward only about a third of the distance from the free 

 borders of the lobes to the midline. Each axillary buttress rises to a point about one-third the 

 distance from the lower end of the first costal to the midline of the first neural. The inguinal 

 buttresses are applied against the contiguous borders of the fifth and sixth costals and rise half- 

 way to the midline of the carapace. 



Echmatemys wyomingensis (Leidy). 



Plate 47, fig. 1; text-figs. 392-403. 



Emys wyomingensis, Leidy, Proc. Acad. Nat. Sci. Phila. 1869, p. 66; Ann. Report U. S. Geol. Surv. 



Montana, etc., 1871 (1872), p. 367; Contrib. Ext. Fauna West. Terrs., 1873, p. 140, plate ix, fig. 5; 



plate x, figs. 1, 2. Cope, Ann. Report. U. S. Geol. Surv. Terrs., 1872 (1873), p. 626. Osborn, 



Scott and Speir, Contrib. Mus. Geol. and Arch. Princeton Coll., No. I, 1878, p. 95. Hay, Bibliog. 



and Cat. Foss. Vert. N. A., 1902, p. 448. 

 Emys jeanesi, Leidy, Proc. Acad. Nat. Sci. Phila. 1870, p. 123; Ann. Report U. S. Geol. Surv. Wyoming, 



' etc., 1870 (1871), p. 366. 

 Emys jeanesianus, Leidy, Amer. Jour. Sci. (3), 11, 1871, p. 372. 

 Emys vyomingensis, Cope, Wheeler's Surv. W. 100th Merid., iv, 1877, p. 53; Vert. Tert. Form. West, 



1884, p. 135, plate xxiii, figs. 9-1 1. 

 Chrysemys wyomingensis, Hay, Amer. four. Sci., xvm, 1904, p. 267, plate xiv, text-figs. }, 4. 



The present species was based by Dr. Leidy on an isolated left epiplastral bone which had 

 been sent to him by Dr. J. Van A. Carter and which had been obtained from the Bridger beds 

 sunn where in the vicinity of Fort Bridger. Wyoming. This bone is now in the collection of 

 the Academy at Philadelphia. It shows that the epiplastral lip, from one gulo-humeral sulcus 

 td the other, had a width of 60 mm. The anterior border is truncated, with a slight notch 

 mesiad of the sulcus named, so that a blunt tooth is suggested. The whole free border is acute, 

 least so just outside the sulcus. The median sulcus on the lower side apparently deviated 

 slightly from the midline, and this caused Leidy to suppose that there had been present a 

 narrow intergular scute. The thickness of the bone at the midline is 12 mm., and the same 

 behind each of the lateral teeth. On the upper surface there is a broad low ridge running along 

 the midline and on each side of this ridge a broad shallow groove. On this surface the gulo- 



