206 
COEYPHODON. 
II. Posterior inferior molars without internal accessory tubercle 
{Batlimodon, Cope): 
a. Posterior inferior molars with small or no heel: 
Large; inferior molars elongate; symphysis manclibuli pro¬ 
duced and narrowed; premaxillary elongate.. C. radians. 
Medium ; inferior molars nearly as wide as long; jiremaxillary 
short... . G. latidens. 
aa. Posterior inferior molars with prominent or wide heel: 
Medium; inferior molars elongate; symphysis mandibuli broad 
and short; premaxillary elongate; tusk trihedral. C. elephanto]9us. 
Smaller; premaxillary bone short; tusk trihedral. C. simus. 
Medium; premaxillary elongate; tusk compressed and grooved. G. molestus. 
The C. eoceenus, Owen, belongs to Section I, and the C. anthracoideus, 
Blv., and G. owenii, H^b., from France, belong to Section II. 
• As compared with the synoptic table of species previously published 
(System. Cat. Eocene New Mexico, 1875, p 29), the present one differs in 
the change of position of the C. elepJiantopus, besides the addition of two 
species. Further investigation shows that some of the specimens without 
posterior heel of the lower molars, formerly refeiTed to the C. elepliantopus, 
belong to the C. radians, while the discovery of the corresponding teeth in 
the former shows that these teeth possess a distinct, though not large, heel. 
Of the above species, I obtained in New Mexico five individuals of 
C. radians, six of C. sinms, four of C. molestus, and one each of the remaining 
species. But there are various other specimens, probably referrible to a 
number of these species, from which some of the parts necessary to absolute 
identification are wanting. Astragali of the subquadrate form, characteristic 
of the C. latipes. Cope, are not uncommon in the collections; but whether 
they belong to that species, or to one of those here described, is yet uncer¬ 
tain. 
The smallest of the American species, the C. simus, considerably 
exceeded in dimensions any of the existing Tapirs; while the largest species, 
the G. lohatus and C. radians, equaled in proportions the Indian Ehinoceros. 
Coryphodon cuspidatus, Cope. 
Plate slvi, fig. 1. 
Bathniodon cuspidatus. Cope, System. Cat, Vert. Eoceue New Mexico, U. S. Geog. Survs. 
W. of lOOtb M., 1875, p. 30. 
Represented by a portion of a mandibular ramus, which supports the 
