488 MANUAL OF ZOOLOGY SECT. 



snout, above the mouth, are the nostrils in the shape of two 

 oblique slits. The large eyes, situated at the sides of the 

 head, have each three eyelids, an upper and a lower hairy lid, 

 and an anterior hairless third eyelid or nictitating membrane, 

 supported by a plate of cartilage. Vibrissce very long stiff 

 hairs are scattered above and below the eyes and on the 

 snout. Behind the eyes and a little nearer the summit of 

 the head, are a pair of very long flexible and movable ex- 

 ternal ears or pinna. These are somewhat spout-shaped, 

 expanding distally, and are usually placed vertically with the 

 concavity which leads to the external auditory opening 

 directed laterally and somewhat backwards. The neck is 

 a distinct constriction, but relatively short as compared with 

 the neck of the Pigeon. The trunk is distinguishable into 

 thorax in front and abdomen behind. On the ventral surface 

 of the abdomen in the female are four or five pairs of little 

 papillae the teats. At its posterior end, below the root of 

 the tail, is the anal opening, and in front of this in the male 

 is the penis with a small terminal urinogenital aperture, and 

 with the testes, each in a prominent scrotal sac, at the sides : 

 and in the female the opening of the vulva. The tail is 

 very short and covered with a tuft of fluffy hair. 



The fore- and hind-limbs, both of which take part in loco- 

 motion and in supporting the weight of the animal, differ 

 considerably in size the fore-limbs being much shorter than 

 the hind-limbs. Both have the same general divisions as in 

 the Lizard. The upper arm is almost completely hidden by 

 the skin, being applied closely against the side of the body. 

 The manus is provided with five digits, each terminating in 

 a horny claw. The thigh is also almost hidden by the skin ; 

 the pes has four digits only, all provided with claws. 



The spinal column of the Rabbit is divisible, like that of 

 the Pigeon, into five regions the cervical, the thoracic, the 



