PLATYGONUS COMPRESS US LECONTE 779 



Width at canine alveoli _...-. . ^o 



Length of lower molar series ----- - . 77 



Length of hiatus in advance of latter ------ 53 



Transverse diameter of the condyle - - - - - 26 



In comparing this skull with those described by W'illiston 

 from the Pleistocene of western Kansas, the following points of 

 interest may be noted: In our specimen the diastema between 

 the incisor and the canine of the mandible is five millimeters *in 

 length, as compared with eleven in the Kansas specimen. In the 



Fig. 2. — Platygonus compressus Lee. Skull of adult male, from the side. 



specimen described by Leidy as the type of EiicJicerus macrops 

 Williston supposed the diastema to be nearly absent, as indeed 

 it seems from Leidy's figure in Plate XXXV. But a comparison 

 of this figure with others of the same specimen on Plate XXXVI 

 convinces me that the former is anything but accurate, and that 

 the diastema is really very considerable. Our specimen further 

 differs from the one described by Williston in having the peculiar 

 asymmetrical cul-de-sac below the anterior margin of the nares, 

 as described by Leidy for Etichoeriis rnacrops. Nothing is to be 

 seen of fossae above the infra-orbital foramen. 



It will be seen that all our measurements fall well within the 

 range of those given by Williston, and the same is true of other 

 measurements not here given. A comparison of these, as also of 



