286 ZOOTOMY. 



and is produced into a process which passes external to the 

 latter, and articulates with the navicular ; this process is a 

 separate bone in the young rabbit, and may represent the 

 entocuneiform. The second metatarsal articulates with the 

 ectocuneiform, the third and fourth with the cuboid : all four 

 are in close contact with one another at their proximal ends : 

 their distal ends are pulley-shaped. 



loi. The phalanges, of which each digit has three : 

 they have the same characters as those of the manus (§ 89. 

 p. 282). 



102. The sesamoid bones of the pes are similarly situated to those 

 of the manus. 



B.— DIRECTIONS FOR DISSECTION. 



XI. Make out the external characters as follows : 



103. The hairy integument, which invests the body, 

 the hairs extending even over the tip of the nose and the 

 walking surfaces of the feet. 



104. The division of the body into head, trunk, and 

 limbs : the union of the head and trunk by a distinct 

 though short neck : the short tail. 



105. The division of the head into a hinder cranial 

 portion containing the brain, and an anterior facial 

 portion or snout. 



106. The external nostrils or anterior nares, oblique 

 slits at the fore end of the snout, connected by a median 

 hairless groove with the mouth. 



107. The mouth, a small transverse aperture bounded by 

 the upper and lower lips ; the hairy integument stops at the 

 edges of these above and below, while at the sides it is con- 

 tinued for a considerable distance into the cavity of the mouth. 



108. The vibrissas, or " whiskers," a number of long 

 stout bristles on the upper lip. 



