58 
EOCET^E TESTUDINATA. 
Length of the posterior lobe of the plastrou. 0.095 
Length of the anterior lobe, including the mesosternum . . .. 0.065 
Greatest lengtii of the episternal ..... 0.049 
Greatest width of the episternal... 0.052 
Length of the inesosternal. 0.030 
Width of the mesosternal. 0.055 
Lengtli of the gular scute. 0.025 
Width of the lip. . ... .. 0.04G 
Eniys euthnetus and E. testudineus* Cope, resemble tins species in some 
respects, but neitber has the transverse mesosternum; and, in the former, 
the marginal thickening of the plastron is much narrower. 
HADRIANIJS, Cope. 
Proceedings Amer. Philosoph. Society, 1872, j). 468.—Ann. Report U. S. Geol. Sur¬ 
vey Terrs., 1872 (1873), 030. 
This genus represents the Testudinidce in the Eocence Fauna of North 
America, and, as such, is characterized by structure adapted for terrestrial 
life exclusively. Three species have been discovered in the Bridger beds of 
Wyoming, which resemble each other in the massive marginal bones of the 
carapace and plastron, and their large size. They were abundant during 
that period. The Wahsatch beds of New Mexico contain no less numerous 
remains of this genus, but which are found in such a fragmentary con¬ 
dition as to render the identincation of the sjiecies less exact than is 
desirable. The insufficient remains at my disposal do not enable me to char¬ 
acterize more than one sjDecies, and do not distinguish this one from one of 
the species of the Bridger beds. Fragments indicate a second species of 
smaller size and more massive proportions than the former. 
Hadrianus corsonii, Leidy. 
P]<ate xxiv, figs. 36-7. 
Tcstudo corsonii^ Leidy, U. S Geological Survey Montana, 1871, p. 366; Report U. S. 
Geol. Survey Terrs , i, p. 132. 
Although fragments of this species are abundant, no considerable por¬ 
tion of any one individual was found. Since the sternal lobes furnish in 
this genus the most striking of the specific characters, I have to rely for 
description on portions of the eiiisternal and postabdominal bones. 
*Ann. Report U. S. Geol. Snrv. T(irrs., 187‘2, pp. 627-628. 
