374 



INTEODUCTION TO ZOOLOGY. 



capable of extension or contraction, but does not act as an 

 instrument of prehension. The Elephant, on the contrary 



i^Fig. 322), is furnished with an organ 

 remarkable for its varied powers of 

 action, combining in the highest de- 

 gree delicacy and strength. In both 

 these instances the proboscis is a pro- 

 lonaration of the muscular fibre and 

 covering, and not a distinct appen- 

 Fig. 292.-HEAD OF tapie. (jage. The Rhinoceros {Fig. 293) has 

 a weapon which is found adhermg to the skin, not growmg 



Fig. 293.— Rhinocekos. 



from the skull ; it is regarded as hair growing in a mass, and 



presenting the appearance of a soUd 

 horn. The Giraffe has bony protu- 

 berances, the rudimental representa- 

 tives of the curved or branching horns 

 with which other tribes of ruminat- 

 ing animals are furnished. In the 

 Staff the horns have at first a hairv 

 skin ; when this has worn away and 

 the horns have remained bare for a 

 time, they are thrown off", and their 

 place is supplied by othei's. In 

 structui-e they resemble solid bone, 



Fig. 294.— Head of Reindeer. 



