290 E. L. Troxell — Status of Homogalax 



the presence of a distinct metaloph on P 3 and the triangu- 

 lar form of this tooth, in the inner cusps of P 2 , in the small 

 upper canine, and in the presence of strong cingula on the 

 outer side of the upper molars. 



12?63 TYPE 

 Y. P. M. 



Fig. 2. — Homogalax bridgerensis, sp. nov. Holotype. Part of the lower 

 jaws. Note the alveoli of the canines and incisors, and the close crowding 

 of the teeth. Nat. size. 



Both the upper and lower series of teeth, except the 

 upper incisors which we do not know, are continuous 

 throughout. We judge the lower canines and incisors from 

 their alveoli. In the lower series the first and second pre- 

 molars each consist of the simple protocone with ridges 

 running to it. On P 3 there is a double central cone, the 

 true protoconid with the deuteroconid isolated from it. 

 The fourth premolar still has the single ridge on its broad 

 posterior heel, but the two anterior cones have separated 

 to form a transverse crest as in the molars. 



The first and second molars have the two ordinary cross 

 crests with the exterior extensions forward as in tapirs 

 and rhinoceroses generally. On M 2 there is a strong 

 antero-exterior cingulum. The teeth gradually increase 

 in size and in the separation of the cross ridges back to 

 the third molar. 



The prominent heel of the third molar amounts almost 

 to a cross ridge in the arrangement of its two cusps. This 

 double cusp is distinctive of Homogalax, as contrasted, 

 with the single one of the original Systemodon. 



So little remains of the skull of this rare specimen that 

 it offers few criteria for its interpretation. The orbit lies 

 over the molars, extending to a point above the first. 

 Unlike that of Helaletes, the antorbital foramen is sit- 

 uated forward, over the third premolar, and there is other 

 evidence that no facial vacuity existed as in that genus. 



