244 O. C. Marsh—Discovery of New Pterosauria. 
entire, and measures about seventeen inches in length. Its 
proximal end presents the peculiar articulation for union with 
the metacarpal, which is well shown in the figures given b 
Quenstedt, von Meyer and Seeley. The outer articular face, or 
that on the ulnar side, is reins | nearly flat transversely, an 
forms almost a right angle with the adjoining side of the shaft. 
The inner face is shorter, deeply concave transversely, with a 
thin exterior edge. The two articular faces converge, and unite 
on a sub-triangular olecranoid process, which projects proxi 
mally from the anconal side of the shaft, thus moving between 
the condyles of the adjoining metacarpal, and preventing the 
flexure of the joint beyond the full extension of the wing. 
extremity. The articular surfaces of all the bones preserved ‘al 
smooth and well defined, like those of mammals and birds. Al 
have been pneumatic. 
The teeth found with remains of this species, and supposed to 
belong with them, are very similar to the teeth of Pterodacty ls 
from the Cretaceous of England. They are smooth, com 
elliptical in transverse outline, pointed at the apex, an 
_ what curved. 
The following are the principal dimensions of the specimens 
mentioned in the previous description. Some of the measur 
ments are only approximately correct, owing to the distortion 
by pressure of several of the specimens: 
some- 
Length of humerus on radial Pa age is Seva ie we 
Length on ulnar side, BPG He Med ea 174 
Greatest diameter of articular head, _------------------- 
st diameter of articular head,...-.-...------------- 12 
Greatest diameter or width of proximal end, -- -- -------- 63 
Greatest diameter of distal end,............----------- 64" 
Vertical diameter of shaft, where [OS CTE by perl 
Length (minimum) of ulna, or larger bone of fore-arm,- - 336 
