Cope.] 418 [Feb. 16, 
Its inner-plane face is horizontal, or even ascending in one species. In i 
the premolar teeth of B. radians, the external crescent lobe is single and 
symmetrical. As the crown contracts inwardly, a second inner crescent 
lobe has a trihedral form, while in one more anterior, the inner is much 
reduced. The inferior premolars are all two-rooted, and form an unin- 
terrupted series. The basis of the molar part of the zygomatic arch orig- 
inates opposite the adjacent parts of the penultimate and last molars. 
The premaxillary bone is massive, and with but little area for attachment 
with its fellow in front. The incisor teeth are large, with subcylindric 
roots, and their alveoli are well separated. In one, perhaps superior, 
the crown is expanded transversely, with convex cutting edge. 
In the humerus, the deltvid hook is developed, but is not much elevated 
above the plane of the head. It originates from an external expansion of 
the head, which bears a shallow cotylus, separated from the head by a 
low, curved, subtransverse ridge. The condyles of the humerus do not 
support any trochlear ridges. An almost perfect femur of B. radians is 
preserved. The third trochanter is not very prominent. The little tro- 
chanter is little developed; the great trochanter is large but does not 
equal the head. The latter is subglobular, and the ligamentous fossa ex- 
tends to its rim. The distal trochlear surface is prominent, the inner 
edge more so than the outer. Its articular surface is broadly continuous 
with those of the condyles; a slight emargination of the outlines only 
marking the usual constriction on each side. In this it resembles Cernide 
and some Antilopidw. The inner condyloid surface is cut off by the 
emargination in Towvogen and Bos bubalus ; the emarginations are deep, 
but do not cut off either in Hquus, Camelopardalis and three species of 
Bos ; while they are so deep as to cut off both in Rhinoceros, 5 sp., HHip- 
popotamus, Bos brachycerus, B. sonduicus and B. sebynicerus and in Ca- 
toblepas. 
i 
BATHMODON RADIANS. Cope. Sp. nov. 
tepresented by portions of several individuals, which indicate an ani- 
mal varying from the size of the ox to that of the Javan Rhinoceros. 
The transverse diameters of all the molars exceed their longitudinal. 
In the penultimate, which may serve as a type, the superior or outer 
plane of the inner crescent ridge extends along about .66 of the pos- 
terior of the outer crescent. In the last molar this surface is very wide 
on the posterior and inner side of the external crescent ; it then contracts, 
and expands again on the posterior side, its outer bounding crest reach- 
ing to the external margin of the crown. 
Besides these points, the molars possess a strong cingulum along the 
anterior base of the crown, which unites with the surface near the 
inner proturberance of the latter in the penultimate ; in the last molar it 
reappears, forming a short lobe on the posterior face. The enamel where 
not worn is slightly rugose. 
' A posterior premolar has a cingulum on the inner obtuse apex. The 
crest of the inner crescent, descending on each side of the apex of the 
