ANCYLOCOELUS 



121 



Leontinia garzoni Ameghino 



L. garzoni, Amegh., 1896, Bol. Inst. Geog. Argen., t. 15, p. 650. 

 L. garzoni, Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 474. 



We were not fortunate enough to find this species, but 

 as described by Ameghino it is about 60 per cent, of the 

 size of L. gaudryi. The type is a lower jaw, for which the 

 following figures are given : 



Lower dentition, length from pm. 1 to m. 3 120 mm. 



Lower dentition, length from pm. 1 to pm. 4 45 mm. 



Lower dentition, length of pm. 4 15 mm. 



Lower dentition, length of m. 3 39 nim. 



Ancylocoelus Ameghino 



Ancylocoelus Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 652. 

 Ancylocoelus Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 475. 

 Rodiotherium Amegh., 1895, Bol. Inst. Geog. Argen., t. 15, p. 653. 

 Rodiotherium Amegh., 1897, Bol. Inst. Geog. Argen., t. 18, p. 476. 



This genus differs from Leontinia in its formula, ~™ 

 but, except for the loss of these canines and the lower pre- 

 molars, is very similar. In this it seems to approach the 

 line which gave rise to Colopdon. The premolars and 

 molars are also narrower in proportion than in Leontinia. 

 I have placed Rodiotherium also under this genus as I can 

 not see a generic difference in the descriptions. However 

 we were not fortunate enough to find these forms. Ameg- 

 hino has described four species as follows: 



A. frequens, 1895, Bol. Inst. Geog. Argen., t. 15, p. 475. 



Upper dentition, pm. 1 to m. 3 



Lower dentition, pm. 2 to m. 3 



Upper molar 3, length 

 A. lentus, 1901, Bol. Acad. Xac. Cordoba, t. 16, p. 407. 



Upper molar 3, length 

 A. minor, 1901, loc. cit. 



Upper molar 3 

 A. (Rodiotherium) armatum, see cit. above. 



Based on an imperfect mandibular symphysis, in which incisor 3 is very 

 large. 



