EXTINCT DAYSURID&. 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 Dasyuride) ; 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. 
AMPHIPROVIVERRA MANZANIANA. 
Protoproviverra manzaniana, Ameghino, Rev. Argent. Hist. 
Nat., -vol.1., 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 Sarcophilus ursinus. 
Distribution Tertiary formation of Patagonia. Remains 
from the same deposits have been regarded as indicating other 
species of the present genus. 
| GENUS PERATHEUTES. 
Peratheutes, Ameghino, Rev. Argent. Hist. Nat., vol. 1., 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. 
Peratheutes pungens, Ameghino, Rey. Argent. Hist. Nat., vol. 
ie. aia (1592). 
