PARASTRAPOTHERIUM 155 
Parastrapotherium insuperabile Ameghino 
P. insuperabile Amegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. 403. 
This is the largest of all the species, and is distinguished 
by the enormous development of the cingulum on the 
anterior, inner, and posterior sides of the upper molars, 
the same being uninterrupted and so elevated, that the 
internal crests seem to rise out of a basin. The following 
measurements are taken from Ameghino: 
Upper dentition, premolar 4, length 37 mm., width 48 mm. 
Upper dentition, molar 3, length 100 mm., width 80 mm. 
Lower dentition, premolar 4, length 43 mm., width 23 mm. 
