MAMMALIA. 



21 



No. 52. Bos primigenms, Boja. 



Cranium with Horn-cores. This species is supposed to be the same as 

 the TTrus mentioned by Julius Csesar in his Commentaries, which, he says, is not 

 much inferior to the Elephant in size (!) Cuvier, Bell, and many other naturalists 

 believe that our domestic cattle are the degenerate descendants of this great Ox. 

 The forehead is concave ; and the horns originate at the ends of the ridge which 

 divides the frontal and occipital regions, and describe a double curvature. This 

 specimen was found in 1840, in the Pleistocene banks of the Seille, France, and 

 is in the Museum of Natural History in Lyons. 



Size, 3 ft. 10 in x 18 in. Price, $9.00- 

 No. 53. Bos primigenms, Boja, 



Skull with Horn-cores. This remarkably fine specimen, represented in 

 the accompanying engraving, was discovered in a peat-bog (Pleistocene) in 

 Amiens, France, and is preserved in the private Geological Cabinet of Mr. Ward, 

 Rochester. Size, 2 ft. 10 in. x 2 ft. Price, $10.00. 



No. 54. Bootherium cavifrons, Leidy. 



Cranium with Horn-cores. In this species, which is closely allied to the 

 Musk-Ox, the frontal bone rises into a prominent process from the sides of which 

 originate the horn-cores. The latter project outwards, downwards, and forwards. 

 The original was found in a gravelly bluff (Pleistocene), near Fort Gibson, on the 

 Arkansas River, and belongs to the Academy of Natural Sciences, Philadelphia. 



Size, 24 x 13. Price, $5.00. 

 No. 55. Bootherium bombifrons, Leidy. 



Cranium with Horn- 

 cores. This species differs 

 from the preceding chiefly in 

 the less development of the 

 frontal ridge, and in the shape 

 of the process which rises 

 gradually into a hump. The 

 specimen was found in the 

 Pleistocene morasses of Big- 

 bone Lick, Kentucky, and is 

 in the Academy of Natural 

 Sciences, Philadelphia. Size, 18 x 12. Price, $4.00. 



