The species was based on a fourth premolar which was 10 mm. long as compared with 13 mm. in _P. lacerans_. We found on the Chico del Chubut, west of Puerto Visser, both an upper and lower jaw belonging to this species, which give us the knowledge of the upper dentition for the genus. The species is distinguished by the smaller size, relatively heavy jaws, and plump teeth, indicating a heavier built animal than _P. lacerans_. The following measurements distinguish the species. [Illustration: Fig. 141. Right mandible—½ natural size.] SPECIMEN 3192 Upper dentition, length premolar 1 to molar 3 76 mm. Upper dentition, premolar 3, length 10.5 mm., width 6 mm. Upper dentition, molar 1, length 11.5 mm., width 8.5 mm. Upper dentition, molar 2, length 12 mm., width 9 mm. Upper dentition, molar 3, length .55 mm., width 12 mm. SPECIMEN 3004 Lower dentition Distance from premolar 1 to molar 3 76 mm. Molar 1, length 11 mm., width 6 mm. Molar 2, length 13 mm., width 6 mm. Molar 3, length 13 mm., width 7 mm. Height of mandible under premolar 4 30 mm. =Notogale= gen. nov. [Illustration: Fig. 142. Upper molars 2 to 4—natural size.] This genus is proposed for the species designated _?Pharsophorus mitis_ by Ameghino (should probably include _?Pharsophorus tenuis_ which however never having been figured and not found in our collection I cannot definitely place). While the upper teeth have the same general character as _Pharsophorus_, they are much more compressed and trenchant. Upper molar 2 is similar to that of _Pharasophorus_ in having the protocone reduced, and the metacone represented by a long sloping ridge. The last molar is also similar in having the antero-external style, the developed paracone, but the protocone is much less developed, appearing only as a ridge. In the lower teeth, however, there is a marked difference, in that the metaconid is lacking on molars, while the talonid is developed into a small basin with a single cusp on the posterior margin. This genus seems to be closest to the Santa Cruz genus _Cladosictis_. =Notogale mitis= Ameghino ? Pharsophorus mitis, 1897, Bol. Inst. Geog. Argen., t. 18, p. 504.