. The Deseado formation of Patagonia . Fig. 88. T. scalaris, premolar 2 to molar 2—natural size. T. angustus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18,p. 484. This species is described without a figure, as smallerthan T. scalaris, pm. 2 to m. 2 being 59 mm. The mandibleis also slenderer. PLEUROCOELODON 131 T. biconus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18. p. 484. _ This species is based on two lower premolars, said to bethe same size as T. angustus, but with the pillar larger. Pleurocoelodon Ameghino Pleurocoelodon, Amegh., 1895, Bol. Inst. Geog. Argen., I. 15, p. ,
. The Deseado formation of Patagonia . Fig. 88. T. scalaris, premolar 2 to molar 2—natural size. T. angustus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18,p. 484. This species is described without a figure, as smallerthan T. scalaris, pm. 2 to m. 2 being 59 mm. The mandibleis also slenderer. PLEUROCOELODON 131 T. biconus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18. p. 484. _ This species is based on two lower premolars, said to bethe same size as T. angustus, but with the pillar larger. Pleurocoelodon Ameghino Pleurocoelodon, Amegh., 1895, Bol. Inst. Geog. Argen., I. 15, p. , Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 484. This genus is distinguished by the absence of the styleon the anterior external margin of the upper molars, in-.
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