CEPHALOPODA. 133 



of the arms is placed the mouth, furnished with 

 two horny jaws, fitting the one into the other, and 

 closely resembling, in form and action, the hooked 

 beak of a parrot, except that the upper mandible 

 works in the lower. The lower jaw contains a 

 fleshy tongue, the structure of which indicates a high 

 development of the sense of taste. 



The intestine, after making one or two turns, 

 proceeds forwards to the under side of the neck, 

 where it terminates in a projecting tube, called 

 the funnel. 



All the senses appear to be present in these 

 creatures in a high degree. That of taste has 

 been already noticed. The eyes consist of a single 

 pair on the side of the head ; they are of large 

 size, very brilliant, and in many respects resemble 

 those of the VERTEBRATA, but yet presenting some 

 peculiarities of great interest to the anatomist. 



The ears are two round cavities in the sides 

 of the head, behind the eyes, in each of which is 

 suspended a membranous sac containing a clear 

 fluid, and a single otolithe (ear-stone), composed of 

 carbonate of lime. 



A pair of organs, which appear to subserve the 

 sense of smell, are also found close beneath or 

 behind the eyes. Each is a minute cavity with 

 swollen borders, containing a soft, wart-like pro- 

 minence (papilla], supplied with special nerves. 



^The sense of touch resides in the whole sensitive 

 and naked skin, in the lips, and especially in the 

 arms and tentacles. 



In animals so highly endowed we may naturally 

 expect a correspondent development of the ner- 

 vous system. Here for the first time we see a 

 distinct brain, enclosed in a box or chamber of 



