T7R8IDJE. 121 



A comparison of the specimens mentioned below with, specimens 

 of the existing form shows that the only difference that can be de- 

 tected between the two is that the teeth of the fossil are slightly 

 narrower. Judging from Lund's figures it seems very doubtful if 

 the so-called Speothos pacivorus and Icticyon major (described from 

 a single tooth) can be regarded as more than large races of the 

 present species. 



Hob. S. America. 



18911. The hinder portion of the cranium ; from a cavern in Minas 

 Geraes, Brazil. Claussen Collection. Purchased, 1845. 



18911 a. Fragment of the left maxilla, containing the four pre- 

 molars and the true molar; from a cavern in Minas 

 Geraes. It is noteworthy that this and other fossil spe- 

 cimens show no trace of m- 2. 



Claussen Collection. Purchased, 1845. 



18911 b. Fragment of the right maxilla, containing pm. 4 and m. 1 ; 

 from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18911 C. Fragment of the premaxilla3, containing the outer in- 

 cisors ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18911 d. Fragment of the mandible, containing the canines of 

 both sides, and the last three premolars and m. 1 of the 

 left side ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18911 e. Hinder part of the left ramus of the mandible, containing 

 the last two premolars, the carnassial, and the alveolus of 

 in72 ; from a cavern in Minas Geraes. 



Claussen Collection. Purchased, 1845. 



18911 f. The greater part of the right ramus of the mandible, 

 containing the whole of the cheek-dentition; from a 

 cavern in Minas Geraes. 



Claussen Collection. PurcJiased, 1845. 



Genus LYCAON, Brookes 1 . 



Dentition : 1. 1, C. J, Pm. \, M. f. The lower dentition differs 

 from that of Canis by the presence of an anterior talon, or cusp, to 

 pm. 4- 



1 Iij Griffith's Animal Kingdom, vol. T. p. 151 (1827). 



