164 Annals of the Carnegie Museum. 



Measurements. 



No. 1080 

 (Type) No. 109, 

 Mm. Mm. 



Skull, length from condyle to and including incisors 315 315 



Skull, length from anterior border of orbit to tip of nasals. 152 147 



Skull, length from anterior border of orbit to condyle. ... 174 178 



Skull, length of alveolar border 175 170 



Skull, length from alveolar border to condyle 132 137 



Skull, greatest transverse diameter 295 285 



Skull, transverse diameter of condyle 67 64 



Skull, transverse diameter of occiput at mastoid plate. . . . 136 122 



Skull, greatest transverse diameter of brain cavity 85 77 



Skull, transverse diameter of frontals over the orbits 95 90 



Skull, antero-posterior diameter of orbit 35 38 



Skull, vertical diameter of orbit 35 42 



Skull, greatest vertical diameter of zygomatic arch 165 158 



Skull, vertical diameter of jugal below middle of orbit. ... 40 35 



Mandible, greatest length 255 260 



Mandible, length of alveolar border 183 180 



Mandible, vertical diameter at condyle 120 107 



Mandible, vertical diameter including coronoid process". . . 118 iii 



Mandible, vertical diameter at Mg' „•■••• 58 58 



Mandible, vertical diameter at canine^ 57 59 



THE SUPERIOR DENTITION. 



(Pl.\te XXXVIII). 



In comparison with the skull the incisors are small, the median pair 

 the smallest. Their position in the alveolar border is quite vertical, 

 and the upper series especially presents a peg-like appearance with a 

 short diastema betv.'een each tooth. The canine is very robust in 

 this genus, and in the present species its external anterior face is 

 convex from side to side and also from the end of the root to the apex 

 of the crown. Antero-internally the face is less convex, and poste- 

 riorly the tooth is flat, so that a cross-section presents a sub-triangular 

 shape not unlike that of Hippopotamus, though not grooved posteriorly 

 as in the latter. The unworn crown of the canine is typical of the Mery- 

 coidodonts generally, but after wear it assumes peculiar shapes, the 

 canines seldom being alike on the opposite sides in the same individual. 



P- is separated from the canine and P- by diastemata; a longer one 

 in front than behind. The tooth is implanted by two roots and the 



' In the illustration (PI. XXXVIII, fig. i) the vertical diameter of the mandible 

 appears less, which is due to the oblique angle of the jaw when in position. 



