n6 



THE DESEADO FORMATION OF PATAGONIA 



sider females. Practically all of the other species are based 

 on mandibular symphyses varying in details from the 

 above, but in no case sufficiently for me to see a specific 

 variation. 



The general features have been discussed under the 

 generic description. Incisor i has a long crown and a 

 long root, and is greatly crowded by the tushes. Incisor 3 

 and pm. I have the same crowded appearance. In giving 

 the measurements I have used a skull which is typically 

 L. gaudryi, a male, and parallel to it have put another skull, 

 which is typically L. oxyrhynca, the female. By compar- 

 ing the two sets of figures, the shortening, of which Ame- 

 ghino speaks, will be seen to be all in the region of the 

 tushes. 



SPECIMEN 3290 SPECIMEN 329 ix 



MALE 



FEMALE 



Upper dentition, length from inc. I to m. 3 

 Upper dentition, length from pm. I to m. 3 



Incisor I, length 



Incisor 2, length 



Incisor 3, length. 



Canine, length 



Premolar I, length 



Premolar, I width 



Premolar 2, length 



Premolar 2, width 



Premolar 3, length 



Premolar 3, width 



Premolar, 4, length 



Premolar 4, width 



Molar i, length 



Molar i, width 



Molar 2, length 



Molar 2, width 



Molar 3, length 



Molar 3, width 

 Lower dentition, height of mandible under m. i 



Incisor I, length 



Incisor 2, length 



Incisor 3, length 



Canine, length 



Premolar i, length 



