MESOZOIC VERTEBEATA. 
31 
Width (median) at ? nostril.. 
Width at front alveolus. 
Diameter of canine alveolus.... 
Diameter of another alveolus. 
Diameter of centrum of (? caudal) vertebra^ transvei 
' (vertical 
Thickness of dermal shield. 
Measurement across four foss® of same. 
Diameter of crown of tooth No. 2. 
Length of coprolite of No. 2. 
Diameter of coprolite of No. 2.... 
The flat and regularly-pitted dermal bones distinguish this genus from 
Belodon. The species was of large size, the cranial fragments equaling 
corresponding portions of the Gangetic gavial. 
Class? 
DYSTROPHYDS, Cope. 
This genus reposes on scanty remains, but which are in good preserva¬ 
tion, and which present marked characters. The bones consist of the 
humerus, three metapodials, some ?carpals, and the distal end of an Kilna, 
with a probable sternum and an inferior element of either the scapular or 
pelvic arch, probably the latter. There is also a number of fragments, 
which are not easily identified. The specimens were discovered by Prof. 
J. S. Newberry in Southeastern Utah, while acting as geologist to the 
Engineer Exploring Expedition under the command of Capt. J. N. Macomb, 
United States Army. He excavated them from the red and green rocks 
usually referred to the Trias, hence from the same formation which yielded 
the Typotliorax already described. Professor Newberry made sketches of 
the bones as he exposed them. They were all, he states, found in close 
proximity, the bones of the limb in nearly normal relation. It is altogether 
probable, according to Professor Newberry, that they belong to a single 
animal. I find nothing to forbid this supposition and much to confirm it. 
One of the most remarkable bones is a broad, flat element, one of whose 
borders is digitate, the processes being long, and separated by deeply entrant 
sinuses. Two sides of the bone are broken away, but the others give origin 
0. 025 
0. 035 
0. 015 
0. 011 
0. 024 
0. 022 
0. 008 
0. 020 
0. 018 
0. 045 
0. 011 
