846 
ARTIODACTYLA. 
corresponding tooth of P. vulcanorum. The first milk-molar is elongate, 
and has a narrow inner crescent formed of an elevated cingiiliim, which is 
interrupted in the middle; the second premolar is thi’ee-lobed, the poste¬ 
rior two lobes composed of two crescents each. The third molar has a 
prominent interior intercolnmnar style. The external crescents are sepa¬ 
rated on the outer face by a strong longitudinal fold of the crown. 
Measurements. 
Length of the milk series... .. 
Length of the first molar..... 
Width of the same... ... 
Length of the second molar. 
Width of the same. 
Length of the third molar. 
Width of the same.. 
DICEOCERUS, Lartet. 
Dicrocerus, Cope, Ann. Rept. Chief of Engineers, 1875, ii, p. 988. 
Merycodns, Leidy, Proc. Acad. Phila., 1854, pp. 90-157; Journ. Acad. Phila., vii, 162. 
Cosoryx, Leidy, Journ. Acad. Phila., vii, 173. 
Molars prismatic; last superior premolar with an internal crescent; 
inferior premolars without internal crescent. Last inferior molar with fifth 
lobe or heel. Frontal bone supporting solid branched horns, which are 
normally continuous at the base. 
The incisors, canines, and anterior superior premolars of this genus 
are as yet unknown, as well as the greater part of the skeleton. The 
distal extremity of the tibia of D. furcatus is much like that of the Deer 
in the downward prolongation of the internal malleolus and anterior 
tuberosity. The internal border is not preserved in our specimen except so 
far as to exhibit the anterior malleolar facet. The extremities of two cannon- 
bones show that they are fully coossified, and contain but a single medullary 
cavity at the distal third. The trochlear carinse and lateral angles are fully 
developed. 
The genus Dicrocerus was proposed by Edouard Lartet in 1839 for 
Ruminants which combine the characters of the Deer and the Antelopes. 
In 1851, the genus was fuidher defined by him, and it was observed that in 
M. 
. 0.061 
. 0.014 
. 0.006 
. 0.023 
. 0.010 
. 0.026 
. 0.015 
