0. C. Marsh—New Tertiary Reptiles. 305 
Part II. 
Glyptosaurus brevidens, sp. nov. 
The present species is well represented by the greater portion 
ofa skeleton in remarkable preservation. “The reptile appears 
to have been covered up, soon after death, in the soft mud of 
the lake, and thus the bones, and even many of the dermal 
Scutes, were preserved in their natural position. The remains 
covered with similar scutes. The malar arch was massive. 
The teeth are rod-like, close together, and unusually short, pro- 
Jecting but slightly beyond the jaw. The summits are obtuse, 
and marked by irregular strie. The pterygoid teeth are 
minute, and arranged in a narrow band. The dermal scutes 
on the malar region are very thick, and have their tubercles in 
concentric rows, forming an ocellated pattern. The dorsal 
plates are large, quadrilateral in form, with the lateral margins 
united by suture, and the ends imbricate. The exposed parts 
of these scutes are covered with small tubercles, arranged ear 
€ margin in rows. e center is more or less carinate 
longitudinally, The cervical vertebre have a keel below, 
which gradually subsides in the dorsal region. The articular 
l is surrounded by a deep groove. 
3 Measurements. 
Width of frontals between GEN hicks cua cee nsdn ees 19: te: 
= agg occupied by five posterior upper teeth,..........- 75 
sdth Of cosipital condyle, 666.65 2. A 8° 
pth of lower jaw at cotylus,....... Pete rents ees 12° 
Length of centrum of anterior dorsal vertebra,.......... 11° 
Width of articular cu pe Bill See ieee (ides ws es 
anse of anterior zygapophyses,....--....++e2+++2+5 15° 
eth of dorsal soute, £55.50 00 bs ass ot ne ge cns cae se 
Width of same) 26. At GA 
This specimen was found by the writer, last September, at 
Grizzly Buttes Wyoming. 
Glyptosaurus rugosus, sp. Nov. 
ment. The prefrontal and postfrontal bones, moreover, ap- 
Proach each other, above the orbit, much more nearly than in 
