196 PATAGONIAN EXPEDITIONS: PALAEONTOLOGY. 
In the Princeton collection there is no specimen which can be confi- 
dently referred to the latter species, although one (No. 15,492) has an 
inferior dentition measuring only 225 mm. from L to mi, inclusive, while 
for N. conspuvcatus and N. andium Ameghino gives this measurement as 
220 mm. On the other hand, No. 15,492 has a much larger and more 
robust jaw and probably a considerably larger skull. The skull figured 
by Lydekker (’93, PI. XIV) has a sharp descent at the forehead, but this 
is very much less marked in other individuals of similar size, especially 
in the type of N andium of the Ameghino collection. 
Localities. — No definite localities are given by Ameghino, Mercerat or 
Lydekker, although the first-named writer states that all of his specimens 
of N. andium were found “near the Cordillera, in the vicinity of Lake 
Argentino” (’94*, 239). 
Nesodon cornutus, sp. nov. 
(Text-figures 35, 36, 38.) 
The type, and, as yet the only known representative, of this species is 
a fairly well preserved skull, without mandible, and with most of the teeth 
Fig. 35. 
Nesodon cornutus, type: Skull, right side, X 3. (No. 16,012.) 
either damaged or quite destroyed. In size, it is rather smaller than the 
average example of N. imbricatus and larger than N. conspuvcatus. One 
