LEONTINIA GAUDRYI 



being by far the commonest fossil of the Deseado beds on 

 the Chico del Chubut River, west of Puerto Visser. As 

 mentioned above, there are two types, the first, with larger 



Fig. 69. Right upper dentition 

 1/2 natural size. 



Fig. 70. Lower 

 dentition of male 

 1/2 natural size. 



Fig. 71. Lower den- 

 tition of female 1/2 

 natural size. 



canines and heavier mandibles, designated by Ameghino 

 as L. gaudryi, which I consider males; second, those with 

 smaller canines, and lighter mandibles, slightly smaller in 

 size, which Ameghino designated L. oxyrhynca and I con- 



