CAiTiD^. 943 



out. The canine is directed upwards and a little outwards, and posseg§es 

 two obtuse ridges bounding the interior face. The third incisor is com- 

 pressed and truncate superiorly and distally. The first (second) premolar is 

 two-rooted, compressed, and trilobate. It consists of a principal cutting 

 edge little elevated, and a small accessory lobe at each extremity of the 

 crown ; its base is expanded posteriorly. The principal cusp of the third 

 premolar is more elevated, and, besides the anterior and posterior tubercles, 

 there is a basal posterior heel, which is continued as an expansion of the 

 inner base of the crown. In the fourth premolar, the base of the crown is 

 expanded, especially posteriorly ; the principal cusp has a nearly circular 

 section at the base, and the posterior median lobe is a subconic tubercle 

 standing on the middle of the heel. The sectorial is large and relatively 

 rather narro'w, but the details of its form are not ascertainable. 



Measurements. 



M. 



Length of dental series, including canine and sectorial 0.076 



Length of the base of the sectorial 0.024 



Length of the premolar series 0.037 



Length of the fourth premolar 0.016 



Width of the fourth premolar 0.009 



Length of the third premolar 0.013 



Width of the third premolar 0.008 



Length of the second premolar 0.009 



Width between centres of crowns of fourth premolars 0.034 



Length of symphysis 0.035 



This species was probably of the dimensions of the Gray Wolf Found 

 by Mr. Sternberg in the same region as the U. stenocephalus. 



Hy^nocyon sECTOEiiJS Cope. 



American Naturalist, 1882, p. 246, fig. 13 d. Hycenocyon hasilatus pars Cope locis alteris citatis. 



Plate LXX ; fig. 1. 



This species is represented by a right maxillary bone in which the last 

 three molars remain, with the alveolus of the first molar and the canine. I 

 formerly supposed this piece to belong to the H. hasilatus, and it furnished 

 the characters of the genus Hyoenocyon in the peculiar dental formula it pre- 

 sents, li belonged to too small an animal to be referable to that species. 



The alveolus of the canine tooth shows that the latter is of large size, 

 and that the root and base of the crown have a round section. The first 

 premolar (second) follows without interspace, and all the teeth succeed each 



