446 



RICHARD S. LULL 



therium torvum (or robuslum). u This skull resembles that of the 

 specimen under consideration in general proportions, though in the 

 former the horns are longer and more projecting. The teeth are 

 badly worn and broken, but the one remaining premolar lacks the 

 cingulum on the outside, as in the Amherst specimen. The canines 

 are lacking, so that their character cannot be ascertained. Professor 

 Osborn accounts for the differences between the type, No. 1476, and 

 No. 1081 by the assumption that the former is a female skull, while 

 the latter is that of a male. He states, however, that "the shape of 

 the canines is the same in both sexes, but the male tusks are much 

 more powerful than in the female." 3 Between the lanceolate canine 

 of M. tyleri and the rounded canine of the M. bicomutus type there 

 would seem to lie a specific distinction which, together with the other 

 differences mentioned in the table above, would probably bring 

 No. 1081 into the new species. 



1 H. F. Osborn, loc. cit., p. 99. 



2 O. C. Marsh, American Journal oj Science (3), Vol. XXXIX (1890), p. 523, Fig. 

 5; figured by Osborn, loc. cit., Fig. 7. 



3 Loc. cit., p. 173. 



