306 O. C. Marsh—New Tertiary Reptiles. 
the species hitherto described. The remains preserved of this 
species indicate an animal about three or four feet in length. 
Measurements, 
Width of both frontals at posterior margin,.........-++ Sh7 
WV Mates WEEWOCN OP DIR os 6 56 bs 5 ons wo ok os snes sees cee 22. 
Extent of postfrontal suture on frontal,.............++ 13°5 
Distance between prefrontal and postfrontal,........+.-. 3. 
Thickness of frontals on median line between orbits,....- 3°4 
The only known remains of the present species were found, 
in September last, at Grizzly Buttes, by Mr. 'T. G. Peck, of the 
Yale party. 
Glyptosaurus sphenodon, sp. NOV. 
A smaller species, probably belonging to the genus (lyplo- 
saurus, is indicated in ou 
River basin. The crowns are long, cylindrical, separated 
slightly from each other, and directed ‘obliquely backward. 
The summits are compressed, and very sharp. ‘The bases of 
the teeth are rugose, and the crowns smooth. This species was 
about two or three feet in length. 
Measurements. 
Space occupied by four upper teeth,............00e0e 0 gees 
Height of upper tooth on inner side,..............-++" :s +e 
MPUOTS TNO FAW os Ses ss ewe des eee woh eee 2° 
Antero-posterior diameter of crown,..........2eeee0e08¢ 12 
The specimens at present representing this species were dis 
covered last autumn, near Henry’s Fork, Wyoming, by Mr. 
T. G. Peck. 
Glyptosaurus ocellatus Marsh. 
This Journal, vol. i, p. 458, June, 1871. 
ortant parts of the same skull and skeleton. The frontals il 
slightly sigmoid longitudinally, the posterior margin and the vd 
terobital region being elevated. They are closely covered wee 
form an ocellated pattern. The plates of the middle row on each 
frontal between the orbits have their length and width nearly 
equal. The pterygoid bones have a narrow band of teeth ee 
their inner margin, and exterior to this in front a second sh po] 
This species was rather larger than the type specime? 
G. sylvestris. 
