H. lustrata Amegh., 1901, Bol. Acad. Cienc. Cordoba, t. 16, p. 405.
This species is smaller than the preceding, and is based on an upper molar 1 and a last lower molar. The measurements are as follows:
| Upper molar 1, | length | 25 mm., | width | 25 mm. |
| Lower molar 3, | length | 25 mm., | width | 12 mm. |
Fig. 91. H, inaequilatera, upper molars 3 and 4—
natural size, after Ameghino.
H. inaequilatera Amegh. loc. cit. above.
This species is larger than the preceding with the internal cingulum more developed. Upper 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 cingulum enormously developed. Upper molar 1 measures 42 mm. long by 36 mm. wide.