96 

 Teionyx vagans Cope. 



Bulletin of the United States Geological Survey of the Territories, No. 2, 1874. — Trionyx ? foveatus, Leidy, 

 Proceedings of the Academy of Natural Sciences, Philadelphia, 1856, p. 312. 



Represented by a number of fragments of costal bones, and, perhaps, of 

 sternals, also. The former are rather light or thin for their width, and are 

 marked with a honeycomb-pattern of sculpture, in which the ridges are thin 

 and much narrower than the intervening pits. They incline to longitudinal 

 confluence at and near the lateral sutures. Several areas are not unfrequently 

 confluent in a transverse direction near the middle of the bone. 



Measurements. 



M. 



Width of the costal hone.. 0.0370 



Thickness of the costal bone _ 0. 0045 



Number of arr;c in m .019, 4 and 5. 



This species differs from the T. for -eat 'us, Leidy, in the much narrower 

 interareolar ridges and larger areas, and in their longitudinal confluence at 

 the margins, characters exhibited by numerous specimens. 



Lignite Cretaceous of Colorado: near the mouth of the Big Horn River, 



Montana; Long Lake, "Nebraska;'' found at the last two localities by Dr. 



1 [ayden. 



CYXOCERCUS, Cope. 



Established on a metapodial bone and caudal vertebrae of a tortoise of 



uncertain, but in any case peculiar, affinities. The caudal vertebras are not 

 anterior ones, almost lacking diapophyses, but are long and slender, and the 

 articular faces singularly incised. The form had a tail more elongate than 

 the snapping-tortoise, and different from it in details of composition, especially 

 in being of the proccelian type. 



Associated with the remains of Clidastes, and other saurians, and at a 

 distance of two or three hundred yards from the locality of the fossil Proto- 

 sfega gigas, were found some vertebra- of a Testudinate reptile, which ap- 

 proaches the type of Trionyx. 



Cynocekcus incisl's Cope. 



The vertebrae have elongate centra concave below, and have well-devel- 

 oped diapophyses. One vertebra has transversely oval articular extremi- 

 ties: in another, they are much less depressed. The former is the more an- 



