(302 THE PUERCO FAUXA. 



unknown; of molars two. Internal cusp V-shaped, sending its horns ex- 

 ternally as cingula to the anterior and posterior bases of the external side 

 of the crown, without intermediate tubercles. Inferior true molars with a 

 crown of two Vs, the anterior the more elevated. Premolars consisting of 

 one open V, with a short crest on a short heel, as in Coryplwdon. 



Dental formula : I ^- ; C. ; P-m. ' - ; M. - ; the last inferior with 

 6 1 ? 4 3 



a heel. A strong sagittal crest. Auricular meatus Avidely open below. 

 Large postparietal, postsquamosal and mastoid foramina. 



Cervical vertebrae rather short; other vertebras moderate, the lumbars 

 not elongate. A large tail. Humerus with a large internal epicondyle. 

 Femur with all the trochanters large. Ilium with the anterior inferior spine 

 well developed. Metacarpals short, plantigrade. Phalanges of second series 

 flat, and of subquadrate outline. The astragalus has a wide head, but no 

 neck, as it is not separated from the trochlear portion by a constriction. It 

 is as wide as the trochlear portion, but about one-third of its length extends 

 within the line of the malleolar face of the trochlear portion. The navicular 

 face is flat, that of the cuboid bone is convex vertically, and one half as long 

 horizontally as the navicular, and only half as deep. These two facets are 

 continuous with the sustentacular below. Interior to all of these, on the 

 internal tuberosity of the head, is a sub-round facet looking inwards, like 

 that characteristic of the genus Bathmodon, but relatively. larger. A con- 

 tinuous facet is seen on the adjacent edge of the navicular. The use of 

 these facets is unknown. 



The brain case indicates small and nearly smooth hemispheres, extend- 

 ing with little contraction into a rather large cerebellum. The olfactory 

 lobes are produced anteriorly at the extremity of a rather long isthmus 



If we consider the dentition alone, Pantolamhda is the ancestor of the 

 Coryphodontidce. The history of the feet requires further elucidation. 



In describing this genus and species, I remarked, loc. cit, that they 

 were "founded on a mandibular ramus, which supports the first true molar, 

 and the last two premolars. The characters of these teeth remarkably 

 resemble those of Coryphodo7i. * * * * it will be for additional 



