Cope.] «>^0 [ Dec. 7, 



The surface of the cranium is too much obscured by cracks and films ol 

 matrix to permit a view of the sutures and foramina. The face is wide, as 

 the posterior part of the maxillary and the malar bone are expanded out- 

 wards. I have not yet been able to ascertain the condition of the orbit 

 posteriorly. The mandibular ramus is rather slender. 



Measurements. M. 



Length of dental series from posterior base of i iii 0248 



" " bases of superior incisors 0060 



" from i iii to P-m. iii, exclusive 0074 



" of premolars on maxillary bone 0060 



• " " base of P-m. iii 0020 



P-m. iv 0028 



Width " " 0038 



~. . f anteroposterior 0030 



Diameters m.i < K 



I transverse 0032 



.~. .. r anteroposterior 0033 



Diameters m. n < . AA , A 



I transverse , 0040 



-r,. . ... f anteroposterior 0030 



Diameters m. uh f „„.„ 



I transverse 0040 



-p.. . • r • .. f anteroposterior 0032 



Diameters inferior m. n { ^ l AAOA 



(.transverse 0030 



Depth of ramus mandibuli at m. ii 0070 



The skull is about the size of that of the Bassaris astuta. D. Baldwin, 

 discoverer. 



The discovery of this type in the Puerco formation is a fact of interest. 

 In the shortening of its dental series it is the most specialized genus of 

 the epoch, while the forms of its true molars are like those of the simpler 

 Creodonta, and more specialized than those of Anaptomorphus, and the 

 lemurs generally. In the simplicity of its premolars, however, it main- 

 tains the general character of the Puerco fauna, and is more primitive 

 than the forms just named. Its nearest ally of the Puerco yet known 

 is Chriacus. 



Anisonchus agapetillus, sp. nov. 



This species is founded on parts of six mandibular rami, none of which 

 has more than four continuous molars in position, including the last. It is 

 not entirely certain that these belong to a species of Anisonchus, because 

 the superior molar teeth by which that genus is distinguished from Haplo- 

 conus and Hemithlaius, are wanting. The inferior molars have the ante- 

 rior inner cusp moderately well developed, as in Anisonchus gillianus. 



The crowns of the true molars consist of two Vs ; of which the posterior 

 base of the posterior one, is rendered irregular by the presence of a small 

 posterior median tubercle. Of the anterior pair of cusps, the external is a 

 little the more elevated, and the internal is more elevated than any ot the 

 posterior ones. The internal posterior as well as the external posterior 



