﻿EXTINCT DAYSURID.E. 269 



different genus of extinct Mammals, but the author is at 

 present unaware where it was first published. 



The characters by which this genus is distinguished from the 

 preceding are not very clearly defined. It appears, however, 

 to be characterised by the small size of the incisor teeth (of 

 which there are four pairs in the upper, and three in the lower 

 jaw, as in the existing DasyuridcB) ; and by the laterally com- 

 pressed canines and premolars, the latter having a small 

 posterior basal tubercle. The palate has large unossified 

 vacuities, and the inflection of the angle of the lower jaw is 

 well-marked. 



AMPHIPROVIVERIIA MAISZANIANA. 



Proioproviverra manzaiiiana, Ameghino, Rev. Argent. Hist. 

 Nat., vol. i., p. 312 (1892). 



This species is of considerably smaller size than the repre- 

 sentative of the last genus, and may apparently be roughly 

 compared in size with Saj-cophilus ursimis. 



Distribution. — Tertiary formation of Patagonia, Remains 

 from the same deposits have been regarded as indicating other 

 species of the present genus. 



GENUS PERATHEUTES. 



Perafheutes, Ameghino, Rev. Argent. Hist. Nat., vol. i., p. 313 

 (1892). 

 An imperfectly known genus, comprising relatively small 

 forms founded on the evidence of specimens of the lower jaw, 

 in which the number of the incisor teeth is not shown. These 

 are said to be characterised by the uninterrupted series 

 formed by the premolar and molar teeth, the small size of the 

 latter, and the extreme compression of the canine. 



I. PERATHEUTES PUNGENS. 



Perafheutes pungens, Ameghino, Rev. Argent. Hist. Nat., vol. 

 i., p. 313 (1S92). 



