PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



ssued fijywfv. \X 0?M1 by (he 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Voi. 93 Washington: 1943 No. 3163 



OSTEOLOGY OF UPPER CRETACEOUS LIZARDS FROM 

 UTAH, WITH A DESCRIPTION OF A NEW SPECIES 



By Charles W. Gilmore 



In a preliminary paper 1 the new genus and species Paraglyphanodon- 

 utahensis was briefly characterized. It is now proposed to give a more 

 complete description of the type specimen and to describe a second 

 species found in the collection made in 1940 by a Smithsonian paleonto- 

 logical expedition under the leadership of Dr. C. L. Gazin. The illus- 

 trations were all drawn by Sydney Prentice. 



Suborder SAURIA 

 Family POLYGLYPHANODONTIDAE Gilmore 



Genus PARAGLYPHANODON Gilmore 



Parafflyphanodon Gilmore, Smithsonian Misc. OIL, vol. 99, No. 6, p. 3, 1940. 



Etymology. — irapa, beside + y\v4>avos, chisel -j- 68ovs, tooth. 



Genotype. — Paraglyphanodon utahensis Gilmore. 



Diagnosis. — Dentition subacrodont, heterodont; teeth short, stout, 

 with sharp lateral and transverse cutting edges ; anterior teeth reduced, 

 with transversely compressed crowns; vertebrae procoelous; no evi- 

 dence of zygosphene-zygantrum articulation ; size of animal small. 



Relationships. — On the basis of the dentition Paraglyphanodon 

 seems to have its nearest affinities with its contemporary Polyglyph- 

 anodon. 2 Such relationship is suggested by the general plan of the 

 dental series: (1) Similarity of crown structure; (2) presence of a 



1 Smithsonian Misc. Coll., vol. 09, No. 6, p. 3, 1910. 



2 Gilmore, Charles W., Smithsonian Misc. Coll., vol. 99, No. 16, p. 1, fig. 1, 1940. 



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