56 
EOCENE TESTUDINATA. 
line is intermediate between the two, while the middle line of the anal is the 
shortest of all. 
Measurementfi. 
Length of carapace restored... 
Length of a costal bone, on curve. 
Width of the same medially... 
Thickness of the same medially.. 
Width of a marginal next the bridge. 
Width of a marginal of the bridge, on curve.... 
Length of the same... .. 
Length of an anterior free marginal. 
Width of the same. 
Length of the caudal marginal. 
Width of the same. 
Axial length of the third vertebral bone. 
Width of the same. 
Axial length of the seventh vertebral bone. 
Width of the same. . .. 
Length of the eighth vertebral bone... 
Width of the same. 
Length of the first pygal vertebral bone. 
Width of the same. 
Length of the plastron ..... 
Length of the posterior lobe. 
Width of the same at the base. 
Width of the same between the apices. 
Length of the anterior lobe. . 
Width of the same at the base .. 
Width of the anterior lip. 
Length of the thickening of the anterior lip_ 
Length of the mesosternum. 
Width of the mesosternum. 
Length of the hyosterual on the middle line ... 
Length of the hyposternal on the middle line... 
Length of the postabdominal on the middle line 
M. 
0.350 
0.108 
0.024 
0.005 
0.041 
0.030 
0.035 
0.045 
0.048 
0.030 
0.035 
0.030 
0.034 
0.014 
0.040 
0.022 
0.037 
0.035 
0.029 
0.290 
0.110 
0.135 
0.045 
0.095 
0.140 
0.050 
0.035 
0.040 
0.059 
0.060 
0.080 
0.058 
Two of the specimens of this species are a little larger than the one 
described. A third is much smaller, and some of its vertebral bones display 
a faint trace of carination. There is in some of the marginal bones of the 
small, and probably in the large, specimens, a small pit for a gomphosis. 
Tliis species differs from the Emys gravis, Cope, from the Wahsatch 
beds of Wyoming, in its general light and thin constrnction. 
