SYNOPSIS OF THE VERTEBRATK FAUNA OF THE PUEKCO SElilES. 339 



cusp of an elevation equal to the internal cusp. There are no interspaces between 

 the first, second and third premolars, and probably not behind the Iburlh, as the jaw- 

 is shallow ami tapers rapidly. It is, however, deeper than in the C. simplex. Mental 

 foramina below the second and fourth premolars. 



There is nothing noteworthy in the humerus. The astragalus has but a short 

 anteroposterior trochlear surface, and it extends well on the neck, indicating a planti- 

 grade foot. It is slightly concave transversely. The malleolar face is oblique, and 

 projects posteriorly beyond the fibular face, which is vertical. The base of the pos- 

 terior notch bridges the minute median foramen. The ulna is much compressed, and 

 has a large olecranon. The humeral cotylus is diagonal to the long diameter of the 

 shaft, and has a marginal llange behind on the interior side, and in front on the 

 exterior side. The radial face is absolutely flat and is directed inwards at an angle 

 of thirty degrees from the vertical. It indicates a flat head of the radius, without 

 rotar}" capacity. Below the superior border of the ulna, on the external side, is a deep 

 gi-oove which extends to the edge of the flange of the humeral cotylus. 



Meaturements. M. 



Length of superior true molars 015 



{anteroposterior 0062 

 transverse 0035 



( anteroposterior 000 



Diameters of m. ii { 



[^ transverse 008 



! anteroposterior OO.M 

 transverse 004 



Length of inferior molars less lu. i 02!) 



" " " true molars 017 



molar iii , OO.W 



f anteroposterior (H)T)T) 



Diameters m. ii { 



(^ transverse 004.') 



Depth of ramus at m. i 010 



Width of distal condyle of humerus in front Oil 



{anteroposterior OOG 

 transverse 007 



f at olecr.inon 009 



Depth of ulna i at cotylus .0005 



I at coronoid 00!) 



Width of astragalus 008 



Width of trochlea 005 



Height of trochlea, external side 0045 



This species is dedicated to my friend Dr. Max Schlosser, of Munich, whose 

 work.s on the extinct Mammalia are among the most important of modern times. 



