. The Deseado formation of Patagonia . is based on isolated teeth, each a mass ofdentine surrounded by a thin layer of cement. The an-terior tooth of the upper jaw is caniniform, the first molarovoid in section, the last molar is bilobed, correspondingto Pscudolestodon. The first tooth of the lower jaw is alsocaniniform, but is two-faced as a result of wear. Theintermediate upper and lower molars are rectangularprisms resembling those of Chlamdotheriiim. 208 THE DESEADO FORMATION OF PATAGONIA Octodontotherium grandis Amcghino O. grandis Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. g
. The Deseado formation of Patagonia . is based on isolated teeth, each a mass ofdentine surrounded by a thin layer of cement. The an-terior tooth of the upper jaw is caniniform, the first molarovoid in section, the last molar is bilobed, correspondingto Pscudolestodon. The first tooth of the lower jaw is alsocaniniform, but is two-faced as a result of wear. Theintermediate upper and lower molars are rectangularprisms resembling those of Chlamdotheriiim. 208 THE DESEADO FORMATION OF PATAGONIA Octodontotherium grandis Amcghino O. grandis Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. grandis Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 505. In addition to the above, Ameghino simply gives thefollowing measurements: First upper tooth, diam. 20 mm., trans, diam. 13 mm., height 80 lower tooth, diam. 21 mm., trans, diam. 16 mm., height 80 lower tooth, diam. 28 mm., trans, diam. of ant. lobe 18 lower tooth, trans, diam. of post, lobe 16 mm., median diam. 7 Fig. T36. A, lower molar, side view—natural size; B,lower molar, cross section—natural size; C, upper molar,cross section—natural size, after Ameghino. Octodontotherium crassidens Ameghino O. crassidens Amegh., 1897, Bol. Inst. Geog. Argen., (. 18, p. 505. This second species is based on isolated teeth of largersize than the preceding, with measurements as follows: Lipper molar, diam. 26 mm., trans, diain. 18 molar, diam., 26 mm., trans, diam. of ant. lobe 21 mm,, of post, lobe 16 mm. ORPHODON 209 Orphodon Ameghino Orphorlon Amcgh., i8«;5, Hoi. Inst. Geog. Argen., (. 15, p. Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 504. The teeth of this (yi^e are a mass of dentine, each sur-rounded by a thin layer of cement, and each tooth suhcy-Hndrical in section, witli the crown worn to two apposedobHque planes. The genus resembles Ortotheriiini.
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