328 DISSECTION OF THE RABBIT. 



4. The scrotal sacs, found in the male only, are a pair of 



prominent oval pouches of skin, at the sides of the 

 penis, into which the testes descend. 



5. The teats or mammee of the female are four or five pairs 



of small papillaj, perforated by the openings of the 

 ducts of the mammary or milk glands. They are 

 arranged at intervals along the ventral surface of 

 the thorax and abdomen ; the most anterior pair 

 being about two and a half inches apart and an inch 

 behind the elbow, and the hindmost pair opposite 

 the thighs and rather more than an inch apart. 



C. The Limbs. 



1. The fore-limbs, as far as the elbows, are. closely applied 



to the sides of the thorax and hidden by the skin of 

 the trunk. The several bones of the shoulder-girdle 

 and limb, which have been already studied in the 

 skeleton, can easily be identified by feeling them 

 through the skin. The palmar surface of the paw 

 is hairy : the innermost digit or poUex is shorter 

 than the others, not reaching the ground. All the 

 digits bear claws. 



2. The hind-limbs are much longer than the fore-limbs. 



The pelvic girdle and the several bones of the limb 

 can be felt through the sldn. In the foot the inner- 

 most digit or hallux is absent, and the remaining 

 four are long and clawed. The plantar surface or 

 sole of the foot is hairy. 



II. THE ABDOMINAL VISCERA. 



Bemove the skin from the trunk and limbs. Lay the 

 rabbit on its back, and fasten it down to the dissecting -board 

 by pins through the limbs. 



A. The mammary glands in the female lie immediately 

 beneath the skin. They are yellowish, fatty-looking, dendri- 



