3 



FOSSIL TURTLES OF NORTH AMERICA. 



height, or extent at right angles with the free border, was about 45 mm. The eighth peripheral 

 had a length along the free border of 41 mm. and a height of about 60 mm. The pygal had 

 a height of 30 mm. and a width of 35 mm. It was moderately recurved and transversely 

 convex above. 



The sulci bounding the horny plates are well markt. Professor Cope describes the first 

 vertebral scute as being longer than wide, the second as long as wide, the third a little wider 

 than long, the fourth still wider; but a study of his figure does not in all respects confirm this 

 statement. The dimensions in the accompanying table are estimated from his figure, as the 

 bones of the carapace are now in a disturbed condition. 



The costo-marginal sulci have pursued their course considerably below 

 the costo-peripheral sutures. 



Professor Cope states that the length of the plastron (fig. 376) was 

 290 mm., and the specimen confirms the statement. He also informs us 

 that the bones were not thick; but no measurements are given. The ante- 

 rior lobe had a length of about 85 mm. and a width of about 140 mm. at the 

 base. Cope's measurements are somewhat greater than those here given. 

 The anterior lip projects somewhat beyond the general curvature of the 

 lobe and is truncated. Seen from above the lip is very concave from side 

 to side and spout-shaped (fig. 377). On each side is a rather deep cleft which separates from 

 the remainder of the lip a rather prominent tooth. The thickening on the upper side of the lip 

 extends backward about 35 mm. At the hyoepiplastral suture the beveled horn-covered 

 surface has a width of about 25 mm. 



The entoplastron has a length of 42 mm. and a width of 55 mm. Its thickness is 13 mm. 

 The bridge is about no mm. wide. 



The length of the hinder lobe is 105 mm., 85 mm. along the midline; its width is 140 mm. 

 There is a posterior notch which has a width of 38 mm. and a depth of 20 mm. The beveled 

 horn-covered surfaces on the upper side of the hinder lobe (fig. 378) have a width, at the 

 hypoxiphiplastral suture, of 27 mm. 



At the crossing of the median longitudinal and the hyohypoplastral sutures the bones are 

 10 mm. thick. The greatest thickness of the epiplastrals is 16 mm. The inner border of the 

 beveled area, just behind the inguinal notch, is 13 mm. 



The inguinal buttress begins to rise from the floor of the plastron at a line not quite halt- 

 way from the free border of the lobe to the midline. 



The gular scutes are 53 mm. long; the humerals, 32 mm.; the pectorals, 41 mm.; the 

 abdominals, 66 mm.; the femorals, 45 mm.; the anals, 34 mm.; all measured along the mid- 

 line. The humero-pectoral sulcus falls slightly behind the entoplastron, resembling in this 

 respect E. shaughnessiana (Cope). However, in one of Cope's specimens the sulcus crept 

 over on the posterior margin of the entoplastron. It is not certain, on the other hand, that this 

 specimen (Cope, Wheeler's Survey, iv, plate xxvii, fig. 3) belongs to the present species. 

 Cope collected altogether five specimens of this turtle, two of them larger than the type, 

 and one much smaller. The latter showed traces of a median carina on some of the neurals. 



Echmatemys cibollensis (Cope). 

 Teit-fig. 379. 



Emys (f)stevensonianus, Cope, Syst. Cat. Vert. Eocene New Mexico, Report to Engineer Dept. U. S. 



Army, 1875, p. 36. 

 Emys stevensomamis, Cope, Ann. Report Chief Engineers for 1875, Append. LL, p. 995 (of reprint, 75). 

 Emys cibollensis, Cope, Wheeler's Surv. W. 100th Merid., vol. iv, part ii, p. 57, plate xxvii, fig. 4; 



plate xxviii, figs. 3-6. Hay, Bibliog. and Cat. Foss. Vert. N. A., 1902, pp. 447. 



The figured specimen of the type of this species belongs to the U. S. National Museum and 

 has the catalog number 2576. The carapace appears to be missing. Cope states that the 

 species was based on a single imperfect individual, in which some of all the characteristic 

 parts were present, except the neurals. Of the parts in his possession Cope figured the epi- 

 plastral lip, as seen from above and from below; the border of the hinder lobe, as seen from 

 above; and two peripheral bones. 



