OF THE CLASS MAMMALIA. 



231 



a fibro-tendinous membrane lines it throughout, and to this 

 and to the forehead and integuments are attached thousands 

 of small muscles, so arranged as to elongate and shorten the 

 instrument in every conceivable manner. A cartilaginous 

 and elastic valvule exists superiorly, so as to cut off, at the 

 will of the animal, all communication between the proboscis 

 and the true nostrils superiorly; a finger-like appendage ter- 

 minates this remarkable instrument inferiorly. The enor- 



Fig. 17S.-Elephant of India. 



