Cope.] "*0 [Feb.'Jl. 



on the posterior third. The superior margin of the enamel on this side 

 is chevron-shaped, the apex being only one-third the length from the 

 extremity. It extends further upwards in front and on the outer side, but 

 is worn in an oval patch at the apex of the chevron of this side by contact 

 with the inferior teeth, as above described. The enamel is smooth 

 behind, rugose in front. The apex contracts regularly to a flattened 

 obtuse point. The fang is hollow for about half its length. The 

 enamel of the molars is nearly smooth. Each one has a strong cingu- 

 lum fore and aft, which is discontinued on the inner and outer faces ex- 

 cept in P. M. 1, and M. 2. In the former, it is continued on the outer 

 side at the base of the concavity of the exterior face; on the latter, it is 

 continued round the inner side. The grinding surface of the P. M. 1, 

 is tripodal, and probably composed of a worn crescent and inner tubercle. 

 The others are transverse arrow-shaped; the P. M. 4 is much more worn 

 than the others. M. 2 is larger than M. 1. Its oblique crests have evi- 

 dently been worn from before. All the molars have three roots, but the 

 posterior pair are united for part of their length in all. 



The vomer does not unite with the superior crest of the palatine 

 bones. The sphenoid flattens out behind the post-nareal trough and is 

 coosified with the basioccipital. The latter is marked by two oval sur- 

 faces at the place of suture, with a slight prominence between. Xo 

 lower jaw was found with this specimen, but from the contraction of 

 the parts opposed to it, it was evidently very small. 



Cranial Measurements. 



M. 



Length from end nasals to end occipital condyle (3 



feet 1.5 inches) 0.930 



Width just behind end nasal shovels 192 



" in front of horns 132 



" at base of horns in front 205 



" behind horns at apex of frontal suture 185 



" above posterior edge meatus auditorius 310 



" between apices horn-cores 370 



" basis supraoccipital horn-core 100 



" including zygomatic arches (greatest) 320 



Length of nasal bones to ridge between horn-cores. . . .410 



" " " " " frontal suture 540 



" of zygomatic fossa above 230 



' ' from angle nares to end shovel 205 



" " " " " " premaxillary 155 



" from end premaxillary to basis of canine. ..... .120 



(( (( « it a a P.M.I 276 



" of molar series 185 



" of palate 450 



" of pterygo-palatine crest 200 



" of sphenoid axis 185 



" " basioccipital (with condyles) 128 



