OSTEOLOGY OF POLYGLYPHANODON—GILMORE 265 
lated specimen U.S.N.M. No. 15816, which also furnished the infor- 
mation as to the character of the ribs. The anterior half of the tail 
was drawn from U.S.N.M. No. 15817, reduced to the desired scale, 
as this was the largest specimen in the entire collection. The fore 
and hind feet are based on articulated extremities of specimen 
U.S.N.M. No. 15568; the scapula, coracoid, clavicle, radius, and ulna 
on specimen U.S.N.M. No. 15559. 
The distal half of the tail and portions of the carpus and tarsus 
are the only structures that were missing and could not be depicted 
from actual specimens. These missing portions have been restored 
in modified form after 7guana. The total number of caudal verte- 
brae depicted in the restoration is therefore conjectural. The tail 
on the restored skeleton has been turned forward in order to keep 
the plate within reasonable proportions. The skeleton as restored 
has an approximate length from tip to tip of 38 inches. 
Taken as a whole the skeleton is typically lizard and, aside from 
the teeth, differs only in details from the skeletal structure of modern 
Sauria and not at all what one might expect in an animal of its 
geological antiquity. The teeth indicate quite conclusively that 
Polyglyphanodon was herbivorous in diet, and the long, strong, 
sharply pointed claws would seem to indicate that it was a terrestrial 
animal, 
U.S.GCVERNMENT PRINTING OFFICE: 19428 
