| 
1871. ] [Cope. 
The teeth are rather long slender and incurved and recurved. There is 
a distinct cutting edge anteriorly and on a greater or less part of the 
length of the posterior face. The crowns are four or five faceted 
on the outer face ; the inner face is more numerously faceted, and striate- 
grooved. The section at the base is sub-circular ; higher, the outer face 
atter, the inner more convex. The apex is acute and the cutting 
edges strong. 
The frontal is narrow, and differs from the other Holeodi here described 
in having the olfactory groove closed by contraction behind. Both 
palatines are preserved. They support twelve cylindric conic teeth which 
have recurved apices and striate enamel. The section is a flat transverse 
oval, where the external transverse process is given off. The shaft of the 
bone is much expanded inwardly with a thickened margin ; exteriorly the 
margin is thin, and is nearly followed by the series of teeth, whose bases 
are exposed externally, and are therefore pleurodont. The emargination 
> pterygoid is very deep. 
; M. 
Dengtl Of axis With OdONUOld..iiis yess. cigs c ds ate 0.074 
oy third cervical...... ee gr a en ean ere aM ey he .048 
, jac 9 
Diameter ball, do. { brace pe ea 
Elevation of spine of do. from centrum..........62. .005.. .046 
Henoth POStELIOM COUSa cals cree eel sr ate ees hess .068 
APE ae 99 
Diameter centrum | taneverse-se seve Flea at see 
Length basioccipital and basisphenoid.... ..............0. 084 
Elevation occipital crest above floor of foramen magnum... .03 
Length suspensorium from foramen ovale..........0.2.05. 09 
Length Os quadratum. i... A ee OT ee res 073 
Width Gistal extremity. iiss cis woe ei ee .036 
Length Os maxiwlare. 0. 5 05 ose. EA TOS 21 
Depth do.at third tooth. eo... ess. es 036 
Length fourth tooth. 202 TEE AOD CE Hea 032 
oy OL Grown Of d0.ae.- eres aeRO ES. en ae : .021 
Length of palatine bone...... Se ee WA Ot Petr vs 155 
This fossil was found by the writer projecting from the side of a bluff 
in a branch of the Fossil Spring Cafion near the mouth of Fox Cafion. 
The bluff was from 80 to 100 feet in height, and the Holeodus was taken 
from a position forty feet below the summit, from the yellow chalk. 
Honcopus TECTULUS, Cope, sp. nov. 
Established on a number of cervical and dorsal vertebra of smaller size 
than those characteristic of the other species of the genus. The centra 
have not suffered from distortion under pressure. The articular surfaces 
are depressed transverse elliptic in outline, with a slight superior excava- 
tion for the neural canal. A well marked constriction surrounds the ball. 
There is a rudimental zygosphen in the form of an acute ridge rising from 
