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 1, length 57 mm., width 57 mm. 
Fig. 103. Upper molar 1 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 to m, 3 455 mm. 
Lower dentition, incisor 2, length 22 mm., width 22 mm. 
Lower dentition, canine, ant. post. diam. at alveolus 52 mm. 
Lower dentition, canine, trans. diam. at alveolus 26 mm. 
Lower dentition, diastema from c. to pm. 3 116 mm. 
Lower dentition, premolar 4, length 28 mm., width 26 mm. 
Lower dentition, molar 1, length 43 mm., width 28 mm, 
Lower dentition, molar 2, length 58 mm., width 32 mm. 
Lower dentition, molar 3, length 70 mm., width 36 mm. 
Height of mandible under molar 3 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. 
