42 
EOCENE EEPTILIA. 
Depth of centrum of same..... 0.012 
Length of anterior caudal... 0. 019 
Width of centrum do. (depressed)... 0.013 
Length of a median caudal. ..... 0.018 
Depth of same in front ...... 0.011 
Width of same in front ........... 0. 012 
Length of ganoid surface of a scale... .... 0.019 
Depth of ganoid surface of a scale .. 0.015 
The points in which the C. aganus differs from the species heretofore 
described are shared by the C. integer, excepting those in which it differs 
from the C. atrox. The entire smoothness of the inferior face of the ver¬ 
tebral centrum distinguishes the C. integer from that species. 
EEPTILIA. 
As is the case with the corresponding Eocene formations elsewhere, 
the most numerously represented class of Vertebrata is, after the Mammals, 
the Meptilla. But three orders are represented, which are all still existing, 
viz, the Lacertilia, the Testudinata, and Crocodilia; the Opliidia have not 
yet been found in the Wahsatch beds. The Tortoises are extremel}^ nume¬ 
rous in individuals and species, and the Crocodiles only a little less so; 
remains of Lizards are comparatively rare. 
LACERTILIA. 
On several occasions, osseous cranial and dermal scuta of Lizards were 
obtained, but always in such a state of dislocation as to forbid the proper 
identification of the genera and species. They are ornamented on their 
superior surfaces by regularly-arranged tubercles, of a shining substance, 
resembling ganome, or enamel. The dermal scuta are rectangular, and dis¬ 
play a fine suture on their borders. 
The species probably belong to the Placosauridce of Gervais, wliose 
remains have been found in the Eocene of Europe. I give figures of some 
of the fragments on pi. xxxii, figs. 26 - 36 . 
