QUADRUPEDS. 197 



Incisors in the upper jaw. 



This natural family of Camelusidae have tusks in both 

 jaws, two incisors above, and six below. Hoofs small, and 

 covering the upper extremities of the two toes. The cells 

 of the second stomach are large, and capable of retaining 

 water *. 



93. CAMELUS. Camel. Each foot united below by a 

 common sole. A dorsal haunch. There are two species, 

 C. bactrianus and C. dromedarius ; the former with two 

 haunches, and the latter with one. 



94. AUCHENIA. Lama. Toes divided. No dorsal 

 haunches. Camelus glama, LIN. 



Without incisors in the upper jaw. 



With horns. Grinders, usually six in number on each 

 side in both jaws. 



A. Horns with a cone. The horns consist of an osseous 

 cone, or elongation of the frontal bone on each side, and 

 covered with horn. The horns are permanent. The 

 structure of the cone, which in one is solid bone, and the 

 other is full of sinuses, furnishes characters for subdivision. 



a. Cone porous. Eight incisors. 



Horns bent anteriorly. 



95. Bos. Ox. The horns are smooth, and bent ante- 

 riorly and laterally. There are several species of this ge- 

 nus, the distinguishing characters of which have been very 

 imperfectly ascertained. 



* LINNJEUS says, " Ventriculus secundus cellulosus pro aqua pura diutius 

 asservanda per siticulosa diserta," Syst. Nat. 90. That the cells are thus 

 employed, has heen demonstrated by Sir E. HOME, PhiL Trans. 1806, 

 p. 357, Tab. xvii, xviii. xix., and Comp. Anat. I. 1651, II. Tab. xxiii, xxiv, 

 xxv. 



