660 CLASS XVII. 



Bos grunniens L., Bos poephagus PALL., the Yack, a species from Thibet, 

 which occurs in the wild and the tame state, with long hair and a long- 

 haired tail, like that of a horse. 



Of all the species, that which deviates most from our cattle is a species 

 from the most northerly parts of North America, Bos moschatus ZIMMERM., 

 GMEL., SCHREB. Saugth. Tab. 302 A (after PENNANT Arctic Zool.), 302 B. 

 Compare HERMANN Zur GescJiichte des Bisamockses, Naturforscher xix. 

 1783, s. 91, Tab. v. This has a hairy muzzle (no rhinarium), and short 

 tail concealed under the long hair ; the horns approach each other at the 

 base, and then proceed outwards and downwards, the point turning up 

 again, nearly as in the gnu. This species forms the genus Ovibos BLAIN 

 VILLE, DESMAR., and the transition to the genus Ovis. 



ORDER VI. Edentata. (Bruta L., exclusive of the genera 

 Elephas and Trichechus.} 



Teeth in the fore part of both jaws none, sometimes both jaws 

 entirely edentulous. Toes with claws large, curved, often com- 

 pressed. 



The edentate mammals sometimes are altogether destitute o 

 teeth, as the name indicates, but sometimes, on the contrary, hav< 

 numerous teeth, which is in contradiction with that name; in the 

 fore part, however, of the mouth the teeth are always absent 

 Dasypus sexcinctus L., (and Das. villosus) alone has, at the back 

 part of the intermaxillary bone, on each side a tooth, which must 

 consequently be named an incisor, and opposite to these two upper 

 teeth are situated four in the lower jaw 1 . The rest have no incisor 

 teeth, and also no true canine teeth. All the teeth are simpl 

 without roots, with an undivided hollow base; thus they never 

 cease to grow as they are worn down above ; they consist of dentine 

 and cement, without enamel. 



All the species of the edentate mammals live in the warmest 

 countries of the earth ; in Europe no one animal is found which 

 belongs to this order. 



Compare W. VON RAPP Anatomische Untersuchungen uler die Edentaten 

 (Mit Steindrucktafeln, Tubingen, 1843, 4to; 2 te vermehrte Auflage, 1852.) 



Family XX. Effodientia ILLIG. Head produced to form 

 an elongate, narrow snout. Feet short, hind feet longer. Claws 

 curved, fossorial. Teeth either none or all similar in form. 



1 See F. CUVIER Des dents des Mammif. pp. 195, 196, PI. 96. 



