322 FOSSIL TURTLES OF NORTH AMERICA. 
few millimeters, then begins to expand and becomes wider than at the base. At the hyoepi- 
plastral suture the lobe narrows again and passes rapidly to the lip. This is relatively narrow, 
47 mm., is notcht at the midline, and is furnisht on each side with a blunt tooth. The epiplas- 
trals thicken toward the lip and become 20 mm. thick. For some distance on each side of the 
symphysis of the bones the thickness is reduced to 15 mm. The lateral expansion of the anterior 
lobe and the lip form the most distinctive characters of this species. 
The bridge has a width of about 138 mm. 
The hinder lobe is 114 mm. long and 156 mm. wide. It is notcht behind, as in the other 
species of the genus. The beveled surfaces (fig. 417) on the upper side of this lobe are 33 mm. 
wide at the hypoxiphiplastral sutures. The posterior buttresses (fig. 418) are wide, beginning 
to rise from the floor of the plastron at a line nearer to the midline than to the free border of the 
lobe. They are articulated to the fifth and sixth costals and rise to a height of 65 mm. above 
the floor of the plastron. 
The gulars have a length of 54 mm.; the humerals, 31 mm.; the pectorals, 68 mm.; the 
abdominals, 83 mm.; the femorals, 51 mm.; the anals, 4g mm., at the midline. The axillary 
scute has not reacht the fifth marginal, nor the inguinal the sixth. 
As in other species of this genus the posterior buttresses articulate with the fifth and 
sixth costals. Fig. 419 represents the anterior lobe of the plastron of No. 1077, American 
41g. 420. 
-* 
; 
Fics. 419 AND 420.—Echmatemys septarta. Anterior lobe of plastron. 4. No. 1077 A. M.N.H. 
19. Lower surface. 20. Upper surface. 
4 420. Upp 
Museum of Natural History. It will be observed how this expands in front of the base. Fig. 
420 presents a view of the same bone seen from above. The width of the lip is indicated, also 
the backward extension of the thickening of the epiplastrals. 
No. 10303 of the collection at Princeton University is to be referred to this species. It 
lacks only a small portion of the rear of the carapace and the tips of the xiphiplastra. It was 
collected in 1878, at Twin Buttes, Wyoming, in the Bridger beds, belonging to level C or D. 
The carapace was close to 335 mm. long. The interior ae the shell is cleaned out, so that all 
parts are exposed. The sides of the anterior lobe are 
Width. hatchet-shaped, as is peculiar to the species. “The horn- 
Vertebral. Length. : covered areas on the upper side of the hinder lobe are 39 
Anteriorly. Greatest. : 
mm. wide. 
The vertebral scutes are narrow at the ends, wide 
1 6 a $7 a A . . A 
; a e a in the middle, the measurements being given in the 
3 78 39 76 accompanying table. 
4 cs) ad 83 ‘These scutes are much wider in proportion to their 
length than in Cope’s type and other specimens studied. 
The sulci are broad and deeply imprest. It is possible that the specimen belongs elsewhere. 
Nos. 1c073 and 10304 of the Princeton collection are likewise referred to E. septarza. 
In the Philadelphia cig collection is the specimen which Leidy described as Emys 
wyomingensts (Contrib., etc., pp. 148, 152, 153, No. 14). It is regarded by the present writer 
as belonging to E. ae The sulci are deeply sunken and the surface of the carapace is 
corrugated. The axillary and the inguinal scutes are well developt. 
