ORPHODON 209 
Orphodon Ameghino 
Orphodon Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 658. 
Orphodon Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 504. 
The teeth of this type are a mass of dentine, each sur- 
rounded by a thin layer of cement, and each tooth subcy- 
lindrical in section, with the crown worn to two apposed 
oblique planes. The genus resembles Ortotherium. 
Fig. 137. Type—natural size, after 
Ameghino. 
Orphodon hapaloides Ameghino 
O. hapaloides Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 658. 
O. hapaloides Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 505. 
In addition to the above, Ameghino gives a figure, here 
reproduced, and the following measurements: ‘Tooth, 
greatest diam. 12 mm., lesser diam., 10 mm. 
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