Pleurocoelodon Ameghino

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.

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,length22 mm.,width26 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.