ANCYLOCOELUS I2I 
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 mm. 
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. 
. . ci £0 . . ° 3043 
This genus differs from Leontinia in its formula, $345 
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. 
| 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. 3 150 mm, 
Lower dentition, pm. 2 to m. 3 150 mm. 
Upper molar 3, length 39 mm. 
A. lentus, 1901, Bol. Acad. Nac. Cordoba, t. 16, p. 407. 
Upper molar 3, length 48 mm. 
A. minor, 1901, loc. cit. 
Upper molar 3 34 mm. 
A. (Rodiotherium) armatum, see cit. above. 
Based onan imperfect mandibular symphysis, in which incisor 3 is very 
large. 
