PROADINOTHERIUM 123 



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 -fi-Jy, 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. 



