1 3 o 



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 prernolar 4 



Fig. 87. 



T. scabrus natural size; /i, upper premolar 4; B, lower 

 molars i and 2. 



The following measure- 



and the molars, and lower molar 2. 

 ments are given: 



Upper premolar 4, length 15 mm., width 21 mm. 



Upper molar 2, length 

 Upper molar 3, length 

 Lower molar 2, length 

 Lower molar 3, length 



T. scalaris Amegh., 1897, Bol. Tnst. 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. 



15 mm. 

 31 mm. 

 35 mm. 

 20 mm. 

 29 mm. 



Fig. 88. T. scalaris, premolar 2 to molar 2 natural size. 



T. angustus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, 

 p. 484. 



This species is described without a figure, as smaller 

 than T. scalaris, pm. 2 to m. 2 being 59 mm. The mandible 

 is also slenderer. 



