458 0. C. Marsh — New Fossil Reptiles, etc. 

 Qlyptosaurus nodosus, sp. nov. 

 In this species, whicTi was somewhat smaller than the one 

 above descnbed, the frontal* are thicker at the median suture. 

 and the shields between the orbits very convex. The middle 

 row of each frontal in this region has the shields longer than 

 wide, and subhexagonal. The tubercles on the shields^'are ;,- 

 proportionally larger, and less crowded together. The ]>■: • 

 the body have the ■ ■' ^ -^ 



3 of them are keeled. The species was about 

 in length. 



Width of single frontal, between orbits, 4'50 lim <. 



Length of four shields on middle row of frontal, 8-60 " 



Length of ventral shield, 7-10 " 



Width, ; .'..'!..'." 3-40 " 



Length of dorsal vertebra, from edge of cup to end of ball, 5-60 " 



Width of cup, 3-75 " 



Depth of cup, 



' 1 of 1 



Expansion of posterior zygapophyses, 

 Thespe. 



Wyoming. 



specimens representing this species were discovered by 

 +^^ — the fresh- water Tertiary strata, at Grizzly Buttes. 



Glyptosaurus ocellatus, sp. nov. 



The present species, whicb was perhaps the largest of the 

 hzards collected by our party, is readily distinguished from tlie 

 two preceding, by the pattern of ornamentation on the cranial 

 plates, which are very thick, united by suture, and have the 

 tubercles arranged in concentric series. The outer row of tu- 

 bercles is considerably the largest, and the next two or three 

 successively smaller; while the center is occupied by a group 

 of very small tubercles, with no definite arrangement The 

 effect of this is to produce an ocellated appearance in each 

 shield, which has suggested the specific name. This effect is 

 mcreased in one ver\^ perfect specimen by the central group oi 

 tubercles being of a 'lighter color. 



The only specimens that can at present be refen-ed with cer- 

 tainty to this species were discovered by Mr. H. B. Sargeut, m 

 the Tertiary beds at Grizzly Buttes, near Fort Bridger. 

 Glyptosaurus anceps, sp. nov. 



A small species of lizard, quite distinct from those descnbed 

 above, is indicated by numerous fragmentary remains m^^ 

 associated with them in the same deposits. Some of the char- 

 acters exhibited by these specimens point toward a ditteren 

 genus, but until additional material is obtained, the specie^ 

 may appropriately be placed in Glyptosaurus. The verteon 



