126 The American Naturalist. [March. 
/3/3. Lateral ungues present. 
y. Nasal bones separated from maxillary and lachrymal bones. 
Horns simple, one pair Saga Gray. 
8. Lumbar postzygapophyses single. (Numerous species not ex- 
e. Inferior premolars three. 
Horns one pair Attiidorcas Gray. 
ee. Inferior premolars four. 
Horns two pair Telracerus H. Smith. 
d(l Lumbar postzygapophyses double. 
Horns one pair; inf. mo). 3 with five columns Capra Linn. 
aa. One or more superior true molars with a median internal column. 
Lumbar postzygapophyses single JE^occt us H. Sm. 
Lumbar postzygapophyses double Bos.*' Linn. 
A great number of names have been given to groups of 
species of the Bovinae, especially within the limits of the 
genus Ovis of H. Smith. Here the various forms of sheep and 
antelopes have been distinguished as genera, and named 
accordingly. So far as concerns the skeleton, further subdi- 
visions than those indicated in the above table do not appear 
to exist, and none have been pointed out. The divisions 
proposed appear to be rather those of one extensive genus. 
The modifications of the skull have reference to the position 
of the horns. These are processes of the frontal bones, and 
are placed at points from above the eye to the posterior angle 
of the facial plane of the skull. In the latfer case this angle 
approaches very near to the supraoccipital crest or inion, and 
the parietal bone is reduced to an exceedingly narrow band 
between the frontal and occipital bones (Riitimeyer).' Forms 
with anterior horns and well developed parietal bones are 
Ovis gazella and Tetraceriis quadricornis; while the Ovis gnu 
1 N. saltianus type. This character is derived from authority to which I 
2 Includes the following supposed genera: Antilope, Gazella, Cervicapra, 
Oreotragus, Cephalophus, Strepsicerus, Damalis, Alcelaphus, Nemorrhjedus, 
Rapicapra, Caloblepas, Haplocerus, Ovis, and Anoa. 
•' Includes the following supposed genera: Eleotragus, /Egocerus, Oryx, 
Addax and Portax. 
« In i9<?ja/«mra««i' the postzygapophyses are single except on the last lumbar. 
■> Die Kinder der Tertiar-Epoche ; Abh. Schwieiz. Pal. Gess., v, 1878. 
