ASMODEUS SCOTTI 141 
molar t. With such an interpretation, we find the incisors 
normal, the canine normal though not as large as in the 
permanent set, and the two-cusped tooth is the first milk 
premolar. The last tooth in the series is considerably 
different from the premolars and is evidently permanent 
molar 1, which is about the size and character of this tooth 
in A. scotti, much too small to belong to A. osborni. This 
set of milk teeth differ from the permanent teeth in that 
the premolars do not have the anterior, inner and posterior 
cingulum, characteristic of the permanent dentition. 
The following measurements are taken from Ameghino: 
Upper dentition, inc. 1 to pm. 4 104 mm, 
Upper dentition, premolar 2, length 18 mm., width 25 mm. 
Upper dentition, premolar 3, length 20 mm., width 28 mm. 
Upper dentition, premolar 4, length 23 mm., width 35 mm. 
Upper dentition, molar 1, length 28 mm., width 39 mm. 
Upper dentition, molar 2, length 37 mm., width 44 mm. 
Upper dentition, molar 3, length 50 mm., width 48 mm. 
