134 
MESOZOIC VERTEBKATA. 
It is altogether probable that this genus embraced terrestrial animals, 
with powerful fore and hind limbs subequally developed. The typical 
species is of gigantic proportions. 
Djrstrophaeus vieemalse, Cope. 
In the supposed sternum of tliis animal (Avhich I have not sfeen, but 
which was sketched by Professor Newberry), a rather small, slender, and 
compressed process projects from near the middle of one of the , sides at 
right angles to it. Only two of the lateral processes are represented as 
complete. The longer is subspatulate; the shorter subacuminate. The 
scapula presents three complete borders,—the proximal and two lateral; 
but the distal is not known. Without it, the length is two and one-half 
times the breadth. The point of junction of the longer (and perfect) short 
border with one of the long borders is much thickened, terminating in a 
mass of bone which is unfortunately broken, but whose section in* the line 
of the end border is a wide oval. From this point, the plate thins away to 
the various borders. The greatest thickness is nearer the border which 
terminates in the enlargement described. This surface is then gently con¬ 
vex in transverse section, while the opposite one is concave to a less degree. 
It is thicker at the middle than at the anterior border in a longitudinal 
direction. 
The proximal extremity of the humerus is much expanded. The 
greater tuberosity is a huge crest, as prominent as the head, and separated 
from it by a marked concavity, which constricts the mass connecting it with 
the head, thus forming a neck. This concavity extends about one-third the 
length of tlie shaft. On the opposite side of the head, a similar concavity 
excavates the shaft, separating the internal from the interior ridge. The 
latter is in its middle portion as prominent as the external ridge, and ex¬ 
tends as far downward. The extensive external face of this part of the 
bone is nearly flat. 
The internal ridge, descending from the head, continues into the poste¬ 
rior border of the interior face of the shaft. The great tuberosity continues 
into tlie single external ridge of the shaft, which is thus near the middle 
