. The Deseado formation of Patagonia . HENRICOFILHOLIA 133 H. lustrata Amcgh., 1901, Bol. Acad. Cienc. Cordoba, , p. 405. This species is smaller than the preceding, and is basedon an upper molar i and a last lower molar. The measure-ments are as follows: Upper molar r, length 25 mm., width 25 mm. Lower molar .3, length 25 mm., width 12 Fig. or. II, inacijuilatera, upper molars 3 and 4—naturalsize, after Amegliino. H. inaequilatera Amegh, loc. cit. above. This species is larger than the preceding with the in-ternal cingulum more developed. LTpper molar 2 measures 30 mm. long by 29 mm,
. The Deseado formation of Patagonia . HENRICOFILHOLIA 133 H. lustrata Amcgh., 1901, Bol. Acad. Cienc. Cordoba, , p. 405. This species is smaller than the preceding, and is basedon an upper molar i and a last lower molar. The measure-ments are as follows: Upper molar r, length 25 mm., width 25 mm. Lower molar .3, length 25 mm., width 12 Fig. or. II, inacijuilatera, upper molars 3 and 4—naturalsize, after Amegliino. H. inaequilatera Amegh, loc. cit. above. This species is larger than the preceding with the in-ternal cingulum more developed. LTpper molar 2 measures 30 mm. long by 29 mm, wide. » H. circumdata Amegh,, loc. cit, above. This is a still larger type, with the internal cingulumenormously de\eloped. Upper molar i measures 42 by 36 mm. wide. CHAPTER X HOMALODONTOTHERIA The forms making up the IIo?nalodontotheria are char-acterized by a dentition which is clearly a derivative ofthat of Toxodontia, hut is distinguished by the teeth beingbrachydont, by the canines being the teeth which tend tobecome tush-like, though not advancing to a markeddegree. Rut the distinctive feature of the suborder isfound in the feet, which are clawed, the ungual phalangesbeing deeply cleft; and further, the animals seem to havewalked on the sides of the foot, suggesting the Ancylopoda;but there does not seem to have been a
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