182 



PROCEEDINGS OF THE ACADEMY OF 



[1879. 



The crowns of all the incisor teeth are narrow or compressed, 

 and, though slightly worn, present no indication of notch. As 

 usual, the external ones are much the largest in antero-posterior 

 diameter. The canines have robust fangs and rapidly tapering 

 crowns, which are but little compressed. The first superior pre- 

 molar is one-rooted, and the crown is simple. The crown of the 

 second is without posterior heel and tubercle, while the third pos- 

 sesses both. The sectorial is relatively short, less so than in C. 

 latrans. The blades are low and obtuse as compared with recent 

 species, and the notch separating them is quite open. The ante- 

 rior external heel is small, and there is no anterior external tuber- 

 cle. The first tubercular molar is large, and the crown is nar- 

 rower than that of C. latrans. It has an obtuse external cingulum. 

 two external conical cusps, a V-shaped median ridge, and a wide 

 internal cingulum. This crown differs from the corresponding one 

 of C. latrans in having conical instead of compressed external 

 cusps, and a simple Y-shaped crest within instead of two adjacent 

 cusps. The second tubercular is smaller than in C. latrans, and 

 its tubercles are less distinct. There are two outer tubercles, a 

 Y-shaped ridge, and an inner cingulum, all very obscure. The 

 enamel of all these teeth is smooth. 



Measurements of Cranium. 



Length along base of skull, including incisive bor- 

 der and occipital condyle 



Length of skull to palatal notch 



Length of skull to posterior border of pterj-goid 

 bone 



Length to front of orbit axially 



Width between zygomas (greatest) 



Width between oi'bits (least) . 



Width at postorbital constriction . 



Width between bases of canines 



Width between bases of second tuberculars 



Width between otic bullae 



Width between apices of paroccipitals . 



Width of foramen magnum 



Width of occiput above .... 



Six well-preserved crania of this species are e 



M. 



.160 

 .075 



.102 

 .046 

 .094 

 .036 

 .021 

 .017 

 .027 

 .009 

 .042 

 .017 

 .032 



nbraced in the 



collection, and the mandible remains attached to some of them. 



