POLYPI. 153 



Snails have horns or feelers growing out from 

 the top of their heads, and at the end of these, in 

 some species, the eyes are placed. 



The structure of many molluscous animals, as 

 the polypi, is so extremely simple, that we cannot 

 discover any particular organ, except a cavity 

 which is supposed to be their stomach. They 

 seem to be nothing but a mass of soft jelly-like 

 substance, and were it not that they move about, 

 one might imagine they were only pieces of some 

 inanimate matter. Yet myriads of these creatures 

 fill the waters, and are placed there for some use- 

 ful and important purpose, as the Lord hath done 

 nothing in vain, "and the earth is full of his good- 



Questions. 



What is the sixth class of animals ? 



In what respect do they differ from mammalia, birds, fishes, 

 reptiles and insects 1 



What colour is the flesh of worms in general, and what is 

 tne cause of this 1 



Are worms warm or cold-blooded creatures ? 



Are worms very tenacious of life ? 



How many feelers or arms has the cuttle-fish ? 



Mention any peculiarity belonging to this animal. 



Where are the eyes of some snails placed 1 



What is remarkable about the structure of polypi ? 



