1886.} Geology and Paleontology. 1045 
is represented by osseous nuclei only, which do not articulate 
with each other. The scuta belonging to the tail are distinct 
from each other, and not coéssified as in Deedicurus. The species 
may be named and described as follows: 
Caryoderma snovianum Cope, sp. nov.—The dermal scuta may 
be arranged in four classes. First, the smallest, which are sub- 
quadrate in outline, and flat; one of the flat faces, probably the in- 
ternal, smaller than the opposite one, and more spongy. Six of 
these; the largest 15™™ in, width. Second, larger scuta, sub- 
hexagonal or pentagonal, or oval, with the dense smooth exter- . 
nal face rising towards and produced beyond one of the borders 
of the base as a flat more or less angular cornice. This cornice 
is separated from the border of the basal part of the bone bya 
rabbet or open groove, Inferior surface perforated by foramina. 
Edges finely rugose. Of this type there are seven scuta. Dimen- 
sions of largest, length 32™", width 35". The third type resem- 
bles the second, but the cornice is represented by a conical ele- 
vation which does not project beyond the edge of the base, but 
stands above or within it. Inferior surface more or less concave. 
Size of largest, length 40™™, width 33™™; of smallest, 15™™ by 
14". Four large and three small. The fourth kind of dermal 
bone is an acute cone with a small convex base, more or less ob- 
liquely truncated. Four of these, two large and two small. 
Measurements of former, base 28™™ by 22™™, total elevation 
.32™™ ; measurement of smaller kind, base 1 5 Dy Fn total 
elevation 22™™, 
__ ity, the surface expanding and forming a shoulder one-quarter the 
length distad of it. Articular surfaces concave vertically, a little 
The discovery of this form in the Loup Fork bed of Kansas is 
_ Of much interest on several accounts. F irst, it is the first time 
_ this group of Edentata has been discovered north of the valley of 
Mexico. Secondly, as belonging to an earlier epoch than the 
> P. ampean Glyptodontidæ of South America, Caryoderma stands 
_ im the position of ancestor. . Thirdly, the rudimental character 
