130 THE DESEADO FORMATION OF PATAGONIA 
T. scabrus Amegh., loc. cit for genus. 
This is the type species, originally based on the third 
lower molar, to which was later added, upper premolar 4 
Fig. 87. T. scabrus—natural size; A, upper premolar 4; B, lower 
molars t and 2. 
and the molars, and lower molar 2. The following measure- 
ments are given: 
Upper premolar 4, length 15 mm., width 21 mm. 
Upper molar 2, length 30 mm: 
Upper molar 3, length 35 mm. 
Lower molar 2, length 20 mm. 
Lower molar 3, length 29 mm, 
T. scalaris Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, 
p. 483, is based on lower pm. 2 to m. 2, a somewhat smaller 
species than the preceding, the series as given measuring 
53 mm. 
Fig. 88. T.scalaris, premolar 2 to molar 2—natural size. 
T. angustus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, 
Dp? 4id4s 
This species is described without a figure, as smaller 
than 7. scalaris, pm. 2 to m. 2 being 59 mm. The mandible 
is also slenderer. 
