1872.] 309 [Cope. 
tion, a deep groove descends to below the middle, probably for ligament- 
ous insertion. The neural canal is subtrilateral. The neural arch is 
as usual in this group deeply emarginate in front, and much prolonged 
behind. The zygapophyses project beyond the ball, and the arch is con- 
tracted in front of them. Its upper surface has neither process nor keel, 
but is rugose for ligamentous and muscular insertion. The diapophyses 
have a wide base, and are subcylindric. 
The surface is delicately reticulate rugose, coarsely rugose on the external 
faces of the zygapophyses. There are several small pneumatic foramina, 
the largest being in the bottom of the groove of the lower face. 
Another vertebra differs in being rather more slender, and in haying 
an obtuse keel of the neural arch. The pit of the ball is wanting, and 
the inferior emargination. The chevron articulations are larger, and 
the groove of the cup occupies the middle, instead of the upper half of 
the cup. 
Measurements. M. 
Length of centrum (greatest). ......... PEA Th Unie e Sh. 0.27 
Vonbical wv eon. Ved oink aie Reldate We Adil. 01 
eng entrury * 
Length of centrum \ Horizontal 214 66 siwes cos vies Set. OLE. 
Elevation top neural arch above floor neural canal......... .013 
Length of arch on median line above. . veers ese ereer eee 02 
Width “ in front of posterior zygapophyses......... .012 
A metacarpal or metatarsal-bone, was found near though not with the 
vertebra, and probably belongs to the same animal. If metatarsal, it is 
much stouter than in Zrionya, but is more likely to be metacarpal, It is.. 
about as long as the vertebrae, centrum and arch together. The proximal 
end is transversely truncate, compressed L-shaped ; the shaft compressed 
sub-quadrate, the articular extremely hour-glass shaped, with an inferior 
projection for the insertion of a flexor ligament. Length, M. .034; prox- 
imal diameter, .013. 
These vertebra indicate a genus with elongate tail like that of Chelydra 
or probably longer ; but they differ from those in that genus, by their 
procoelian character. An approach to the incised margins is to be found 
in Trionye ; but in those of that genus, where this character appears, the 
diapophyses are largely developed. The genus is evidently quite distinct 
from anything known, and we await further remains with interest. The 
species is much smaller than the Protostega gigas, and about equal to the 
Mississippi Macrochelys. 
Tt may be called CYNOCERCUS INCISUS, The remains on which it 
is established were found by Sergeant Wm. Gardner, of my geological 
expedition in Kansas, in the yellow chalk near to Butte’s Creek, south of 
Fort Wallace. 
The discovery of this species and of the Protostega constitutes the first 
indication of the existence of Testwdinata in the cretaceous formation 
of Kansas. The author originally pointed out the existence in -it: of 
