THE ANIMAL KINGDOM. j^ 



as the Snail, have shells, whilst the Slug is left totally 

 unprotected. Nor does the casing assist in motion, for 

 when the animal moves it is compelled to protrude its 

 organs of motion from the shell. The Mollusca are very 

 numerous in fact, they are almost universally distributed ; 

 for some live in water, some on land, and some are 



Fig. I02.-THE CUTTLE-FISH. 



; mphibious. They are, as you may well suppoee, very 

 various in their forms and modes of life. I will en- 

 deavour to point out the peculiarities of the leading 

 species, as far as the limits of this little book will allow. 

 Firstly, then, I will mention those called Cephalopoda, 

 or head-footed. You will see that no better name than 

 this could have been chosen, for \hefeet of the animal 

 are placed round its head. These feet are called tentacles, 

 and are very strong members; they are covered with 



