a 
764 The American Naturalist. [September, 
referred by Prof. Riitimeyer to L. annectens are very similar to those 
of H. (Desmatotherium) guyotii Scott, from the Bridger Eocene. 
Lophiodon isselensis Fischer, (Taf. I, fig.9). This is a distinct type. 
The figure agrees closely with that given by Gaudry* of a complete 
series of upper molars. This exact type of molar has not been found 
in America. So far as known,the true Lophiodon, like Palwotherium, 
was confined to Europe. The characteristics of this Lophiodon molar 
are that both paracone and metacone are conic and nearly of the same 
size, in this respect it resembles the Tapir, but it differs widely from 
the tapir in the origin of the transverse crests, for the protoloph passes 
up to the paracone and the metaloph springs from the metacone, 
whereas in the Tapir these crests spring from the anterior base of the 
external cusps. 
Turn now to Prof. Riitimeyer’s earlier volume : 
Lophiodon rhinocerodes Riitimeyer, (Taf. I, fig. 4). The type 
molar of this species is, as the name implies, of the true rhinocerotine 
pattern. It is closely similar to the first upper molar of Amynodon 
(Orthocynodon) antiquus from the upper division of the Bridger 
Eocene, as figured by Scott and Osborn,’ except that the tooth is much 
larger and the parastyle is more prominent. The lower canine is 
quite different. This form therefore is distinct from Amynodon in 
several features. 
Lophiodon tapiroides Cuvier, (Tab. II, figs. 15-26). The first and 
second molars have nearly the true tapir pattern. The protoloph 
joins the robust parastyle. The metaloph rises half way between the 
paracone and metacone. The third molar, however, is not tapirine for 
the ectoloph is abbreviated as in the rhinocerotine type, in L. isselensis, 
and in Heptodon. 
Lophiodon parisiensis Gervais, (Tab. III, fig. 27-35). This molar 
has no exact counterpart in the American Eocene. 
Lophiodon cartieri Riitimeyer, (Taf. III, fig. 38-40). -These molars 
are precisely similar to those of the middle sized Hyrachyus, H. 
agrarius of the Bridger Eocene. 
Egerkingen, Bridger, 
Species. Nearest Allied Form. Family. 
L. annectens Isectolophus annectens Tapiridæ 
L. cartieri Hyrachyus eximius Hyracodontidæ 
L. rhinocerodes Amynodon antiquus Amynodontide or 
Rhinocerotide 
L. isselensis unique Lophiodontide. 
L. parisiensis = ? E 
tapiroides " : 
6« Enchainements du Monde Animal,” fig. 72. 
TE. M. Museum Bulletin, No. 3, Pl. V, fig. 2, 1883. 
= Sa Ry 
