150 



THE DESEADO FORMATION OF PATAGONIA 



as enumerated under the generic description. The lower 

 jaws belonged to an old individual. The humerus and 

 scapulae were found associated, the femur isolated. 



Of the upper dentition, the only available measurements 

 are those of Ameghino for the first molar, and the canine. 



Upper dentition, canine, length 256 mm. 



Upper dentition, molar i, length 57 mm., width 57 mm. 



Fig. ioj. Upper molar r of the left side — natural size, 

 after Ameghino. 



The measurements of the complete pair of lower jaws 

 which we found are 



Lower dentition, length from inc. 1 torn. 3 



Lower dentition, incisor 2, length 



Lower dentition, canine, ant. post. diam. at alveolus 



Lower dentition, canine, trans, diam. at alveolus 



Lower dentition, diastema from c. to pm. 3 



Lower dentition, premolar 4, length 



Lower dentition, molar I, length 



Lower dentition, molar 2, length 



Lower dentition, molar 3, length 



Height of mandible under molar 3 



455 mm. 

 22 mm., width 22 mm. 



52 mm. 



26 mm. 

 116 mm. 

 28 mm., width 26 mm. 

 43 mm., width 28 mm. 

 58 mm., width 32 mm. 

 70 mm., width 36 mm. 



83 mm. 



The scapula is a very long heavy bone, with a narrow 

 blade, and a high spine which has its upper margin thick- 

 ened so as to appear like a banister rail. We found one 

 complete scapula and a second incomplete one associated 

 with it, which corresponded in all ways to the first one. 



