1841.] Illustrations of the Genera of the Bovince, 469 



than the frontal plane and forming an acute angle therewith : Horns 

 attached to the highest line of the forehead, rounded, moderate, curved up 

 or down or forward: 13 pairs of ribs : no true dorsal ridge, but sometimes 

 a fleshy hump : dewlap and muzzle large and square. 

 Type. Bos domesticus. 



Bibos. Cranium large, massive, exhibiting preponderance of the fron- 

 tal and cerebral portions over the facial : frontals as long as the face, 

 concave, broader than long, and surmounted by a large salient crest ascend- 

 ing above the highest bases of the horns. Occipital plane of the scull 

 spheroidal, very large, larger than the frontal plane, deeply indented in 

 its centre by the temporal fossa? and forming an acute angle with the fron- 

 tal plane. Horns attached below the highest line of the frontals, massive 

 but short, ovoid or subtrigonal, and curving ascendantly : 13 pairs of ribs : 

 a true dorsal ridge coextensive with the ribs and terminating abruptly : 

 Dewlap and muzzle small ; period of gestation longer than in Bos. 

 Type, Bibos Cavifrons. 



N. B. Gavceus an aberrant species leading to Bos ? 

 Bison. Cranium moderate, depressed, inclining to Bubaline forms in 

 the excess of the facial portion over the frontal, and in the rounding off 

 of the frontals into the occiput : frontals decidedly broader than long, 

 more or less convex, and forming an obtuse angle w r ith the semicircular 

 or trigonal occipital plane, which is strongly ridged by the parietes at its 

 summit, is smaller than the the frontal plane, and moderately indented. 

 Horns attached rather in advance of the parietal apex of the Cranium, 

 small, rounded, curving ascendantly, or out of the horizontal : 14 (or 15) 

 pairs of ribs ; a true dorsal ridge but confined to the withers and terminat- 

 ing posteally in a gradual slope : Dewlap and muzzle small. 

 Types, B. Americ anus, et Poephagus. 



Bubalus. Cranium large, elongate compressed or narrow, dispropor- 

 tional exhibiting great excess (a 3d) of the facial over the frontal or ce- 

 rebral portion : frontals short, narrow, convex, usually forming an obtuse 

 angle with the occipital plane, which is large and circular in proportion to 

 the obtuseness of that angle and to the consequent arcuation of the cul- 

 menal line of separation : Parietals merged, not ridged as in the last, nor 

 culmenal. Horns attached to the ends of the highest line of the scull, al- 

 ways exceeding in length that of the Cranium, and usually greatly so 

 depressed, strictly trigonal and neither ascending nor descending but di- 

 rected horizontally backwards : thirteen pairs of ribs : no true dorsal 

 ridge nor fleshy hunch : muzzle large and square : Dewlap medial. 

 Type Bubalus Arna. fsem, Arnee. 



