40 KANSAS UNIVERSITY QUARTERLY. 



characters of this tooth. The skull is deep but narrow, the zygo- 

 matic arches, though somewhat crushed, evidently did not stand 

 out so prominently as in H. robiistiis. The sagittal crest is con- 

 cave, rising into a prominence at the occiput, which is strongly 

 overhanging. The post-orbital processes are projecting and curve 

 slightly forward; the supraorbital margin is less prominent than 

 in H. robtistus. The zygomatic processes project well below the 

 basicranial axis as is common in species of this genus. The 

 mastoid process is strong and mucli roughened for muscular 

 attachments. The posterior nares open on a line with the posterior 

 border of the sectorial. A median ridge extends the entire length 

 of the bony palate. A groove leads backward from the posterior 

 nares as far as the anterior portion of the basi-occipital, where it 

 divides and the branches lead respectively to the precondylar 

 foramina. 



The mandible is marked by a deep descending flange, second 

 only to that of Eiismilits in prominence, its long diastema, and its 

 deep masseteric fossa sloping away on its superior border to the 

 short, stout coronoid process. The condyle is proportionally 

 longer and more slender than in H. rohiisiiis, and the angle is more 

 projecting. The two specimens differ quite markedly in the ante- 

 rior portion of the mandible. In the larger one, in which only 

 that portion in front of the third premolar remains, the flange is 

 eleven millimeters deeper, the chin seven millimeters broader, and 

 does not show the constriction below the base of the lower canine 

 which is present in the smaller specimen. The diastema is seven 

 millimeters longer, and the rami are much thicker and stouter at 

 the superior border. There are three mental foramina in the 

 smaller specimen and two in the larger. 



The infraorbital foramina, as in H. robiistiis, are proportionally 

 smaller and more triangular than in the lion. The post-glenoid 

 foramina are present; but small and directed far inward. The 

 lachr3'mal foramen lies well within the orbit, is small and nearer 

 the infraorbital foramen than in //. rohiistiis, and is directed more 

 downward. The spheno-palatine foramen lies just on the median 

 side of, and near the posterior palatine foramen, as in the last-named 

 species, and is only a trifle larger. The optic foramen is small, 

 laterally compressed, and is situated directly above the sphenoidal 

 fissure. Above and in front of the optic foramen, situated about 

 midway of the spheno-frontal suture, is the well-developed fora- 

 men spinosum. The spheno-orbital foramen, the rotund foramen 

 and the anterior opening of the ali-sphenoid canal appear at the 



