0. ©. Marsh—New Tertiary Reptiles. 303 
more complete specimens, may be mentioned. The entire body 
and tail was covered with ornamented osseous plates, most of 
them united by suture. The rami of the lower jaw were but 
loosely attached at the symphysis. There were numerous small 
teeth, “dents en cardes,” on the pterygoids. The malar arch 
was complete. The parietals were thick, and there was a 
parietal foramen. The pelvic arch and the limb bones resemble 
those in the Iguanas, but the posterior limbs were proportion- 
ally smaller. The caudal vertebre, in some species at least, 
were divided transversely by a thin unossified septum, so 
that the centra break there readily, as in many recent lizards. 
those of Heloderma. "The lower teeth were close together, and 
had their bases deeply fluted. The frontal bones are very 
ry 
are closely and irregularly crowded together. They are tuber- 
cular, and collectively resemble the patern of some of the 
pla 
Measurements. 
= occupied by anterior twelve lower teeth, 23° 
idth of frontals at posterior edge of nasal suture, --- -- 15°6 
Width at posterior edge of prefrontal suture, 19° 
Greatest thickness of frontals on median line, 5° 
Width of cotylus of lower jaw,. ne A 
Longitudinal diameter, . 5... 2c paves 3 
_ The type specimen of this species was found by the writer, 
in Sealer last, in the Eocene shale at Grizzly Buttes, 
Wyoming. 
Oreosaurus vagans, gen. et Sp. NOV. 
were not covered with osseous scutes. The body was thus pro- 
tected, but the dermal plates preserved, even those evidently 
