Pronesodon cristatus Ameghino
P. cristatus Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 626.
P. cristatus Amegh., 1897, Bol. Inst. Geog. Argen., t. 15, p. 467.
This species is very imperfectly known, is characterized by a large external anterior style, molars said to be 15 mm. wide.
Pronesodon robustum Ameghino
P. robustum Amegh., loc. cit. above.
This is a larger species, of which the three lower molars are known, and which measure 16, 22, and 30 mm. in length respectively, while they are 9-10 mm. wide.
Coresodon Ameghino
Coresodon Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 630.
Coresodon Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 459.
Coresodon Gaudry in part, 1908, Anal. Palaeontologie, t. 1, p. 46.
In this genus, the pattern of the upper molars is essentially the same as in Proadinotherium, and they are of the same hypsodont character, and with roots. I can now find only the fact that in Coresodon the teeth are more compressed and somewhat more hypsodont, as a feature by which to distinguish this genus from Proadinotherium. Gaudry figures the front of a lower jaw under the name Coresodon which lacks the caniniform incisors. I have doubted the association, but should it prove correct, then this genus would be markedly different in that respect. Two species have been described, C. scalpridens, and C. cancellatus, both of which I consider the same.