242 O. C. Marsh—Discovery of New Pierosauria. 
viduals, which differed somewhat in size, but all tend to con- 
fi e conclusions based on the fragments first examined. 
From the locality which furnished one of the original specimens, 
we recovered the proximal end of the right wing-finger meta- 
earpal, which evidently belonged with the distal extremity de- 
scribed, and proves the entire bone to have been at least fifteen 
inches in length, or much more elongated than any hitherto 
known. With this specimen were found portions of the second 
and third phalanges of the same wing-finger, all indicating the 
great size and power of the wings. Another specimen, found 
by the writer at a higher level, in the yellow chalk, pertained 
to a larger individual, and is of much interest. It consists of the 
distal extremity of the left-wing metacarpal, articulated to the 
adjoining proximal end of the first phalanx. Both bones are 
in excellent preservation, and show this characteristic joint most 
The most important remains of this species yet discovered, 
however, consist of nearly all the bones of a right wing, from 
the humerus to the last phalanx inclusive, which were found 
by the writer in place in the gray Cretaceous shale, during out 
investigations near the Smoky River. Although more or less 
fractured, the bones are in general well preserved, and show 
clearly the peculiar structure of the Pterosaurian wing, as wel 
as the especial characters that mark the present species. 
humerus, which is nearly perfect, is remarkably short 
and robust, and in its main features surprisingly bird-like. 
is concave transversely, thus differing widely in this respect 
from the avian type. The ulnar crest is very prominent, aud 
its proximal extension is continued to the line joming the ra ial 
and ulnar angles of the articular head. The radial crest 18 
prominent, but scarcely exceeds the ulnar ridge in s1Ze, and 18 
hence proportionally much smaller than in most of the Ptero- 
actyls described. Its point of greatest extension 18 nearly 
pneumatic foramen on the anconal side of the proximal bee 
tremity. The shaft of the humerus is smooth, sub-c eta 
in transverse outline, and apparently less sigmoid longitudinally 
than in the species already known. The osseous walls are thin, 
and very compact. The distal extremity is much flattene?, 
and has the articular condyles very similar to those 1n the hu 
‘merus of birds. The radial condyle is the larger, and mor 
prominent. It is oval in outline, and extends obliquely rather 
more than half way to the ulnar side. Near its termination 0 
the palmar surface, and on the ulnar side of the median line, 18 
a large, oval, pneumatic foramen. There is here no indication 
