LEONTINIA III 



In the lower dentition, the first two incisors are small 

 cropping teeth, with the anterior face flattened and having 

 a trace of a cingulum; while on the inner face the cingulum 

 is well developed. Incisor 3 is developed into a tush cor- 

 responding to inc. 2 in the upper dentition. As in the 

 upper teeth, there are two types, that of L. oxyrhynca with 

 the tush only about twice the size of an incisor, and that 

 of L. gaudryi with it much larger. 



All the premolars are molariform and of the typical tox- 

 odont character, consisting of two crescents with a pillar 

 and septum in the posterior crescent. The septum, how- 

 ever, does not appear until on pm. 3 and on all succeeding 

 teeth, and is usually indicated by a tiny pit. From the 

 front to the back, the premolars are progressively larger, 

 each having a cingulum on both the internal and external 

 faces. The molars continue to increase in size progres- 

 sively, and have the same characters as the premolars, 

 except that the crescents are more elongated, and the cin- 

 gula are gradually becoming smaller toward the rear. 



The skull is low and heavy, with a low sagital crest, and 

 with the lambdoidal crests continuous with the upper mar- 

 gin of the zygomatic arches. The nasal bones are short 

 and wide, and are markedly raised above the nasal cham- 

 ber. On the outer margin of each is a low boss, somewhat 

 as on the nasals of the rhinoceros, Dicer atherium, which 

 would indicate that this form had a small pair of nasal 

 horns.* 



The frontal bones are broad, projecting laterally in strong 

 postorbital processes, which, with those from the jugals, 

 almost close the orbit behind. The premaxillae are pecu- 

 liar in having a median crest on the upper surface, the top 

 of the crest being rugose, as though in life it had continued 

 upward as a cartilage septum. The maxillae rise well up 



* Scott has restored the head of Leontinia gaudryi with a single median horn, 

 but no specimen in my collection would indicate anything but a pair of nasal 

 horns. See Scott, Mammals of the Western Hemisphere, fig. 138, 1912. 



