PROADINOTHERIUM 128 
molars of Proadinotherium or some similar form. The 
genus Senodon, which Ameghino also places in this family, 
I feel will prove to be worn teeth of Leontinia. 
Proadinotherium Ameghino 
Proadinotherium Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 625. 
The dental formula is {743, as in Adinotherium, the 
chief difference being that the teeth are less hypsodont 
Fig. 80. P.leptognathus, rear portion of skull—1/2 natural size; shaded areas are matrix. 
than in the Santa Cruz genus. Little is known as yet of 
the skeleton, but when more is known probably more dis- 
tinctive characters will appear. Ameghino made two 
species, P. leptognathus which we also found, and P. angus- 
tidens a much smaller form, 
