Pleurocoelodon, Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 645. Pleurocoelodon, Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 484. This genus is distinguished by the absence of the style on the anterior external margin of the upper molars, instead of which the external face is excavated medianly. Two species are described, based on isolated upper teeth. [Illustration: Fig. 89. P. wingei—natural size; _A_, first molar; _B_, third molar.] =P. wingei= Ameghino P. wingei Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 645. P. wingei Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 485. This species is founded on a couple of isolated molars, probably belonging to the same individual. The following measurements are given: Upper molar 1, length 22 mm., width 26 mm. Upper molar 3, length 24 mm., width 29 mm. =P. cingulatus= Amegh., loc. cit. above, is based on an incomplete upper molar, probably the second, which is distinguished by having the internal cingulum excessively developed. It measures 30 mm. in length. =Lophocoelus= Ameghino Lophocoelus Amegh., 1904, Anal. Soc. Cient., Rep. Argen., t. 58, p. 245. Lophocoelus Amegh., 1904, Anal. Mus. Nac., ser. 3, t. 3, p. 352. The genus is founded on a single upper third molar from Mazaredo, which is distinguished by a feeble style on the external face, by the anterior lobe being obliquely placed, and by the presence of a small secondary bay on the posterior side of the great internal basin. =L. macrostomus= Amegh., loc. cit. above. This species is the only one described, and has the generic features, the upper m. 3 being 21 mm. long, by 25 mm. wide. =Henricofilholia= Ameghino Henricofilholia Amegh., 1901, Bol. Acad. Nac. Cordoba, t. 16, p. 404. The type species is _H. cingulata_, based on a single upper molar. In general the upper molars are similar to those of _Leontinia_, but more brachydont, and with the internal cingulum well developed and tending to be crenulated. Four species have been made, all based on isolated upper molars. =Henricofilholia cingulata= Ameghino H. (? Parastropotherium) cingulata Amegh., Bol. Inst. Geog. Argen., t. 15, p. 640. H. (? Parastropotherium) cingulata Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 450. H. cingulata Amegh., 1901, Bol. Acad. Nac. Cienc. Cordoba, t. 16, p. 404. [Illustration: Fig. 90. H. cingulata, upper molar 1—natural size, after Ameghino.] This is based on an upper molar 1 of which I reproduce Ameghino’s figure. It measures 28 mm. long by 29 mm. wide. =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. [Illustration: Fig. 91. H, inaequilatera, upper molars 3 and 4—natural size, after Ameghino.] =H. inaequilatera= Amegh. loc. cit. above.