108 Annals of the Carnegie Museum. 



Length of upper molar series measured along alveolar border.... 61 



Length of lower molar-premolar series no 



Length of lower premolar series 46 



Length of lower molar series 64 



The specific name is given on account of the short skull. 

 Ticholeptus bannackensis sp. nov. 



(Plate XXX.) 



(Type No. 995, Carnegie Museum Catalogue of Vertebrate Fossils.) 



The type, which was collected by the writer in 1903, consists of a 

 portion of the anterior upper part of the skull, a mandible, and the 

 greater portion of a skeleton. There is also a part of another skeleton 

 (No. 1 185), but no complete skull. Both specimens were taken from 

 beds, which are undoubtedly of Miocene age, on Grasshopper Creek 

 about ten miles above Bannack in Montana. 



The portion of the skull which is preserved shows that the anterior 

 nares were large, broad, and well rounded above. They are situated 

 far back. This imparts to the face an appearance somewhat similar 

 to that of Merycochoerus. It is uncertain whether or not the nasals 

 were much shortened anteriorly. They are broad at the posterior 

 border of the anterior nares and narrow rapidly backward, terminat- 

 ing above the anterior portions of the orbits. 



The mandible is deep and the angle broadly rounded. The chin 

 is sloping and concave above the angle. The horizontal ramus in- 

 creases in depth from beneath P^ to below the middle of M^ where 

 the angle begins. 



The teeth are hypsodont. The faces of the inner crescents of the 

 last two upper molars are concave vertically. The length of the pre- 

 molar series is a little less than that of the last two molars, and a 

 little more than that of the first two molars and the anterior lobe of 

 the third. 



Compared with other species the limbs are intermediate in length, 

 fairly robust. The cuboid is unusually high for its width. 



Measurements. 



mm. 



Length of mandible 217 



Depth of mandible beneath P^ 4 1 



Depth of mandible beneath middle M^ 54 



Depth of mandible at coronoid process 128 



Length of lower dental series 144 



