Cope.] "*'o [Oct. 7, 



II. Horns covered willi skin (Cosorycinpe). 



Teeth bracliyodont ; no frontal excrescence Blastomeryx Cope. 



Teeth prismatic ; no frontal excrescence Cosoryx Leidy. 



III. Horns naked (Sivatheriinfc)- 



Teeth bracliyodont ; two pairs of horns, all separate 



Sivathermm Cautl. Falc. 

 Teeth brachyodont ; two pairs of horns ; those of the anterior pair from 



a common base Bramatherium Cautl. Falc. 



Teeth brachyodont ; one pair of horns, from a single base 



Hydaspitlierium Lydd. 

 Teeth brachyodont; one pair of horns, from distinct bases 



Dieroeerus Lart. 



IV. Horns covered with a horny sheath ; teeth hypsodont (Bovinte). 

 a. No internal column of true molars. 



/9. 1^0 lateral ungues. (Nasal bones normal ; postzygapophyses 

 single.) 



Horn-sheath furcate Aniilocapra Ord. 



Horn-sheath simple Nanotragus Sund. 



j?/?. Lateral ungues present. 



y. Nasal bones separated from maxillary and lachrymal bones. 



Horns simple, one pair Saga Gray. 



yy. Nasal bones more or less in contact with lachrymal or 

 maxillary bones. 

 d. Posterior postzygapophyses single. (Numerous species 

 not examined.) 

 £. Inferior premolars three. 



Horns one pair •. Antidorcas Gray. 



££. Inferior premolars four. 



Horns two pair Tetracerus H. Smith. 



Horns one pair ; last inferior molar with four columns. .Neotragus* Gray. 

 Horns one pair ; last inferior molar with five columns. . . . Oms\ H. Smith. 

 od. Posterior postzygapophyses double. 



Horns one pair ; inf. mol. 3 with five columns Capra Linn. 



aa. One or more superior true molars with a median internal 

 column. 



Dorsal postzygapophyses single JEgocerusX H. Sm. 



Dorsal postzygapophyses double Bos \\ Linn. 



A great number of names have been given to groups of species of the 

 BovinfE, especially within the limits of the genus Ovis of H. Smith. 

 Here the various forms of sheep and antelopes have been distinguished 



* N. snUianus type. This character is derived from authority to which I cannot now 

 refer. I have not seen it. 



■f- Includes the following supposed genera : Antilope, Gazella, Cervicapra, Oreotragus, 

 Cephalophus, Strepsicerus, Damalis, Alcelaphus, Nemorrhsedus, Rapicapra, Caloblepas, 

 Haplocerus, Ovibos, Ovis, and Anoa. 



X Includes the following supposed genera : Eleotragus, iEgocerus, Oryx, Addax and 

 Portax. 



II In Bos americanus the postzj'gapophyses are single except on the last lumbar. 



