514 GEOLOGICAL SURVEY OF THE TEERITOEIES. 



EXOSTINUS SERRATUS, Cope, loc. cit. 



Char, specif. — A series of tubercles along each supra-orbital borderj 

 longitudinal at the front, quadrate at the back part of the eyebrow. A 

 single series of tubercles separates them. Five tubercles in a trans- 

 verse row at the posterior margin of the frontal. Two series of flat 

 tubercles on the zygomatic bone. Deutary quite convex on outer face ; 

 inner face slightly convex ; 8 teeth in 0°>.0050. 



Measurements. 



M. 



Length of frontal, (nearly complete) 0.0070 



Width of frontal posteriorly 0034 



Width of frontal at post-orbital point 0045 



Width of frontal between orbits 0018 



Length of zygomatic 0070 



Depth of dentary at last tooth 0030 



Length of a mandibular tooth 0018 



About the size of the common eastern seine, {Eumeces fasciatus.) 

 ACIPRION, Cope. 



Synopsis Vert. Colorado, p. 17. 



CJiar. gen. — Eepresented by a dentary bone, with nearly all of the 

 teeth remaining. A groove, apparently the Meckelian, extends along 

 the inferior border of the distal half of the bone. The teeth are truly 

 pleurodont, closely placed, and cylindric, with compressed crowns. The 

 latter supports a large median and two small lateral cusps, three in all. 



ACIPRION FORMOSUM, Cope, loc. cit. 



Char, specif. — The crowns project well above the alveolar border. 

 External face of dentary smooth, with rather distant foramina. Ten 

 and a half teeth in 0°^.0050. 



Measurements. 



M. 



Depth of dentary at middle 0.0022 



Length of a median tooth 0018 



Elevation of same above alveolus 0010 



This species is about the size of our Cnemidophori. From all the 

 genera oi this group, Aciprion differs in the uniform character of the 

 teeth, there being no simple teeth in the front of the series so far as 

 I)reserved. A jaw-fragment probably represents a second species of this 

 genus. 



DIACIUM, Cope. 



Synopsis Vert. Colorado, p. 17. 



Established on the sacral vertebra of a large lizard, which presents 

 such peculiarities as to indicate that its affinities are remote from those 

 above described. 



The diapophysis is subcylindric and elongate. Centrum concave be- 

 low; neural arch flat above. Articulation without zygosphene or rudi- 

 ment of it ; zygapophyses oblique, the arch deeply excavated between 

 the anterior ones. Obliquity of ball inferiorly. 



DiACIUM QUINQUEPEDALE, Cope. 



Char, specif. — Two hypapophysial tubercles below the ball. Centra 

 slightly depressed, the cup excavated above and below. An angula- 



