PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued 8&|*(VA- sbiSl by the 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Vol. 93 W.ihington : 1942 No. 3158 



A NEW FOSSIL REPTILE FROM THE UPPER 

 CRETACEOUS OF UTAH 



By Charles W. Gilmore 



In 1939 the Smithsonian Paleontological Expedition discovered the 

 fragmentary skeletal remains of a small reptile in the Upper Cre- 

 taceous of the North Horn Mountain area in central Utah. The 

 diminutive size of this individual, its amphicoelous vertebrae, and a 

 dermal armor form a combination of features previously unknown 

 among the extinct Reptilia of the Upper Cretaceous, and although 

 the skeletal remains are meager this unique specimen is described as 

 a new species of a new genus and referred provisionally to the 

 Crocodilia. 



PINACOSUCHUS MANTIENSIS, new genus and species 



Type.—V. S. N. M. No. 16592, consisting of a maxillary fragment, 

 7 vertebral centra, proximal end of coracoid, shaft of femur, and 

 numerous dermal scutes and spines, with various fragments. Col- 

 lected in 1939. 



Locality.— "Lizard locality," South Dragon, Manti National Forest, 

 Emery County, Utah. 



Horizon. — North Horn formation, Upper Cretaceous. 



Diagnosis. — Teeth thecodont; vertebrae amphicoelous; two sacral 

 vertebrae; caudal vertebrae chevron bearing; dermal armor, consist- 

 ing of sharp, rounded spines ; spined, plain, and ridged scutes ; limb 

 bone with large medullary cavity. Individual small. 



The scanty skeletal materials comprising the type specimen were 

 found in a small cluster on the surface of the exfoliated matrix, and 



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