160 Annals of the Carnegie Museum. 



The length of Pi is nearly the same as that of P^ but it is much 

 broader. These teeth are so worn that the exact original form of the 

 crown cannot be made out. The last molar is longer and broader 

 than those preceding it. 



Lower Teeth. — The incisors are all large, the anterior being the 

 largest and the posterior the smallest. I y though somewhat worn has 

 a crown 25 mm. in height, and it is more nearly symmetrical than the 

 other incisors. It is semiprocumbent. I 3 is slightly less procumbent. 

 The canine is large, curved, and oval in horizontal section. The an- 

 terior premolar is smaller than the canine and is conical in form. Pre- 

 molars two and three have each two large roots. The teeth are narrow 

 transversely, but the three posterior premolars increase in length and 

 width from the second to the fourth. Of the molars only the last on 

 the right side is completely preserved. This is long antero-posteriorly. 



The Skull. — The skull is long and proportionally low, the frontal 

 plane broad, the brain-case quite large and full, the sagittal crest low 

 and long, and the posterior portion of the zygomatic arch slender and 

 arching upward. The lachrymal vacuities are large and oval in form. 

 The facial pits are large. 



Palate Vieiv. — The alveolar borders of the premaxillaries are thick 

 transversely and are roughened in front of I-. The anterior tips 

 arch upward and approach each other but are not in contact in the 

 present specimen. The incisive alveoli are long and narrow. The 

 palate gradually widens from before backward to the canine and then 

 gradually narroAvs to P-^, but the last incisors, the canines, and the 

 first premolar of the opposite sides are nearly the same distance apart. 

 The lower border of the pterygoid curves downward and ends in a 

 rounded point. The posterior border ascends steeply. The lower 

 surfaces of the basioccipital and basisphenoid are broad, and broadly 

 convex transversely. 



Lateral View. — The infraorbital foramen opens into a fossa or de- 

 pression above the anterior portion of Mi. Above this is a large 

 concavity. The lachrymal vacuity is large and oval. The anterior 

 border of the orbit is above the middle of the last molar. The zygo- 

 matic arch is rather slender behind the orbit and is arched upward. 

 The postglenoid process is weak and thin antero-posteriorly, but rests 

 against the high tympanic, from which it is partially separated on the 

 outer side by the postglenoid foramen. The tympanic bulla is high. 

 The inner portion is destroyed in the type specimen, but the outer 



