Douglass : Dromomeryx. 465 



teeth, the molars have a more decided tendency to become hypso- 

 dont, (2) the upper molars are not provided with heavy cingiila, (3) 

 the upper molars and last premolars are set more obliquely in the jaw, 

 (4) the postero-internal crescents have slender horns reaching nearly 

 to the outer crescent, and (5) there are median ribs on the outer 

 surfaces of the postero-external crescents. There are numerous other 

 small differences, but we have not sufficient material oi Falceomeryx for 

 extended comparisons, and so cannot properly estimate the taxonomic 

 value of many of the characters. 



It should be stated here that one specimen No. 706 (Carn. Mus. 

 Cat. Vert. Foss.) which was described under the name Palaomeryx 

 americanus, though smaller than the known specimens of Pakeoineryx, 

 is more nearly like that genus in having shorter horns on the posterior 

 portions of the antero-internal crescents, in having the outer faces of 

 the postero-external crescents concave, and in having more coarsely 

 wrinkled enamel. This specimen will be figured and referred to later 

 in this paper. 



There are other probable differences between Dromomeryx and 

 Palceomeryx as for example the supposed absence of horns or antlers 

 in the latter and the presence of large, very unique and characteristic 

 horns in the former. Indeed it appears now that the two genera are 

 not closely related, and had it not been for the differences in the 

 horns it would perhaps be more difficult to separate the American 

 genus Dromomeryx from Dicrocerus. 



Osteology of Dromomeryx. 



The following descriptions are taken principally from No. 827, 

 Carn. Mus. Cat. Vert. Foss. They are supplemented by descriptions 

 of parts of No. 1542 (Carn. Mus. Cat. Vert. Foss.), which is usually 

 referred to by number when mentioned. 



Of No. 827, we have the skull, the left ramus of the mandible, the 

 bones of the neck with the exception of the last two cervicals, five 

 lumbar vertebrae, the sacrum, a large portion of the pelvis, a humerus, 

 a radius, and one anterior canon-bone. Other portions of skulls and 

 skeletons were found in the same deposits. Among these there is a 

 specimen (No. 1542) which consists of large portions of a skull 

 including a complete molar-premolar series, the bones of the neck 

 with the exception of a part of the atlas, the first four dorsal vertebrae, 

 a nearly complete fore limb exclusive of the scapula and a large por- 

 tion of the hind limb including part of the hind foot. 



