30 



the largest Uintatheria. The nasal bones are coossified, and the horn T 

 cores are sub-cylindric, obtuse and about two inches in length. They 

 are situated above a point a little behind the anterior nares. 



PANTODONTA. 



As already pointed out, the structure of the limbs and feet in this 

 suborder is as in the order generally, and the scapula has the same form 

 in general. There is also a resemblance in the form of the symphysis 

 mandibuli, which though furnished with teeth, forms a long solid spout 

 comparable to that of the^ Elephant. The astragalus has a very peculiar 

 form, being even more exceptional than in Uintatherium. The superior 

 articular surface is flat or concave in the middle. It is turned inwards 

 in front of the articular face fot the inner malleolus, terminating in a 

 long point. The cuboid articular face is quite small and sublateral. 

 The fibular facet is extensive, and the internal lateral well marked. 



On the other hand the coracoid process is produced into a curved hook, 

 and is thus more largely developed than in other Proboscidians or Peris- 

 sodactyles. The neck is longer than in the other Proboscidians, and the 

 parietal bones appear to be narrowed by the approximation of the tem- 

 poral fossa, as in the Rhinocerus. Almost nothing however is known of 

 the structure of the skull. 



The genera are two, as follows : 



Penultimate molar unlike the last, with external crescent 

 and embracing ledge Bathmodon. 



Three molars alike, with two transverse crests not meet- 

 ing within Metalophodon. 



BATHMODON. Cope. 

 Proceedings American Philosopical Society, 1872, 417. 



This genus was originally chiefly distinguished by the dentition ; at 

 present many other important peculiarities are added. First, as regards 

 the molar teeth ; the two transverse crests I find to be separated (not 

 united) at their inner extremities, by a narrow fissure. The anterior is 

 much the longer, and is curved ; its anterior wall slopes steeply down 

 to the narrow cingulum. The posterior is short, and straight, and bears 

 a crest. The numbers are I. 3 ; C. 1 ; P. M. 4 ; M. ? 3. 



The entire mandible presents the following dentition ; I. 3 ; C. 1 . P. 

 M. 4 ; M. 3. The incisors radiate round the narrow extremity of the 

 trough-like symphysis, and have transversely expanded crowns. The 

 canine is inclined forwards and forms part of the same series. Its crown 

 is triangular in section, the outer face convex. In the males it was 

 enormously enlarged as indicated by a symphysis in my possession. The 

 anterior premolar approached the canine. The former teeth have an ex- 

 ternal chevron directed inwards, whose extero-superior surface of enamel 

 is acute cordate. Beside this is a little longitudinal ridge, which represents 



