PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 
SMITHSONIAN INSTITUTION 
U. S. NATIONAL MUSEUM 
Vol. 92 Washington: 1942 No. 3148 
OSTEOLOGY OF POLYGLYPHANODON, AN UPPER 
CRETACEOUS LIZARD FROM UTAH 
By Cuaries W. GitMore 
One of the important discoveries made by the 1937 Smithsonian 
paleontological expedition to central Utah was the finding of eight 
‘individuals of an undescribed member of the Sauria. In 1938 a field 
jparty under Dr. C. L. Gazin revisited the locality and recovered the 
jremains of four more individuals, one of which is the most complete 
is yet found. These specimens, four of which were partially 
jarticulated, so fully supplement one another that, except for the 
‘distal end of the tail, practically all other parts of the skeletal 
‘structure are now known. Although among the most ancient Sauria 
from North America, they have the distinction of being more com- 
pletely preserved than any specimens of the suborder yet discovered 
on this continent. These specimens display a type of dentition not 
‘before known in the Sauria, either living or extinct. 
Associated with the relatively abundant species is one other 
smaller species represented by several incomplete jaws. 
A preliminary description of these two lizards has already been 
published,’ and it is the purpose of the present paper to describe 
the complete osteology of Polyglyphanodon. The smaller forms of 
this fauna will be considered in a separate article. 
| The drawings illustrating this paper were made by Sydney Prentice. 
1 Gilmore, C. W., New fossil lizards from the Upper Cretaceous of Utah. Smithsonian 
Mise, Coll., vol. 99, No. 16, pp. 1-3, 1940. 
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