Cope] iyO [Nov. 2, 



in cross-section. The face in front of the orbit is concave below the can- 

 thus rostralis. The nostrils are not large, and are sub-round. They are 

 widely separated, being nearer the maxillary border at its junction with 

 that of the premaxillary, than to the median line. The mandible is shal- 

 low, and not very stout. Its inferior border rises from below a point a 

 little in front of the fundus of the epiotic sinus to the angle, which is at 

 the quadrate articulation. Symphysis short. 



The sculpture of the anterior portions of the muzzle is coarsely punctate ; 

 on the posterior portions of the upper and lower jaws it is ridged and pit- 

 ted. Most of the upper surface of the skull is still covered with a thin 

 layer of the matrix, so that the sculpture and the character of the lyra, if 

 any there be, remains unknown. 



The teeth, as has been observed, are not visibly grooved, but the charac- 

 teristic feature of the group may be represented by numerous delicate 

 crack-like lines which one sees on the basal portions. These, however, 

 look like the result of weathering. The sections of all the teeth would be 

 round, but for the cutting edges, which are not very prominent. In addi- 

 tion, the premaxillary teeth are coarsely fluted on the median half of their 

 length. The fluting is not visible on an antero-lateral mandibular tooth, 

 nor on a posterior maxillary tooth. The microscopic structure of the teeth 

 is not yet investigated. 



The bodies of the vertebrae have concave sides, and a sub-round section. 

 Their neural spines terminate in an obtuse enlargement. Many of the 

 characters of the vertebral column are yet concealed in the matrix. The 

 distal portions of the ribs are straight, cylindric, and become stouter at the 

 extremity. 



Measurements. M. 



Length of cranium from the extremity of the os quad- 



ratum 433 



Length of cranium on middle line . 335 



Length from end of muzzle to nostril 073 



Width of cranium between quadrates 306 



" epiotics . . . . . . 118 



orbits 086 



at orbits 294 



between nares 085 



Diameter of orbits ■[ anteroposterior 048 



I transverse 057 



Length of premaxillary tooth 025 



Diameter " " .007 



Length of posterior maxillary tooth 010 



Diameter.of median " " 007 



Length of a dorsal centrum 024 



Vertical diameter of do 025 



Elevation of neural spine of do .050 



Length of rib on curve 080 



