UPPER CRETACEOUS LIZARDS GILMORE 211 



A) is at once evident. The anterior teeth have transversely com- 

 pressed crowns that swell inward at the base. The fourth tooth from 

 the front of the present series has an incipient vertical ridge developed 

 on the inner side of the crown that divides this face into two unequal 

 parts, the posterior being the larger. The three teeth that follow, 

 the fifth, sixth, and seventh, widen abruptly transversely and display 

 a sharp transverse cutting edge that extends inward at right angles 

 to the outer cutting edge. This transverse edge is at a slightly lower 

 level than the apex of the outer side. The smooth, sharp transverse 

 edge strongly suggests a functional use similar to that of Polyglyphan- 

 odon. The last tooth of the series is much reduced in size, the fore 

 and aft and transverse diameters being about half the dimensions of 

 those of the preceding tooth. It also retains a reduced inner cutting 

 edge, shown clearly in specimen U.S.N.M. No. 15876. The bases of the 

 crowns of practically all the teeth swell out and then contract sharply 

 to the roots. 



PARAGLYPHANODON GAZINI, new species 



Type. — U.S.N.M. No. 16580, consisting of an imperfect skull, articu- 

 lated with the lower jaws, upper and lower teeth, associated with short 

 sections of articulated vertebrae, and fragmentary ribs. Collected in 

 1940. 



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

 Emery County, Utah. 



Horizon. — North Horn formation, Upper Cretaceous. 



Description. — The specimen selected as the type of this species was 

 collected from the same level and in association with specimens of Poly- 

 glyphanodon sternbergi and Paraglyphanodon utahensis. The poorly 

 preserved skull has been worked out in relief on a small block of matrix, 

 and fragmentary though it may be it gives the first information of 

 the cranial structure of Paraglyphanodon. The skull consists of the 

 incomplete parietofrontal region, the right postorbital, impression in 

 the matrix of the right jugal, and the imperfect left maxillary and 

 the alveolar border of the right. There are four teeth in the left 

 maxillary and fragments of two in the right maxillary. The left 

 ramus, which has been fully freed from the matrix, carries a series 

 of six posterior teeth but lacks the tip. The anterior half of the right 

 dentary is missing, but the posterior portion bears five teeth. The right 

 quadrate is preserved in situ, as shown in figure 7. 



At this time its larger size and the differences found in the denti- 

 tion distinguish this new species from its contemporary, P. utahensis. 



The preservation in the matrix of much of the profile of the right 

 side provided sufficient evidence for the reconstruction illustrated in 

 fig. 7. The anterior maxillary portion and the anterior half of the 



