212 



THE SCIENCE OF LIFE. 



Victor Hugo have some foundation in the large size and 

 repulsive aspect of these creatures. They crawl with 

 their arms on the bottom of the sea, head downward, 

 and also swim backward or forward, usually with the 

 back downward, by means of fins, or squirt themselves 

 backward by forcing water through their funnels. 



The Paper Nautilus (Argonaut a) (Fig. 116) and the 

 Poulp have eight arms. The Squid (Loligo) and Cuttle- 

 fish (Fig. 117) have ten arms, the additional pair being 



FIG. 117. Cuttle-fish. 



longer than the others. Their eyes are movable, while 

 those of the Argonaut and Poulp are fixed. The Squid, 

 used for bait by cod-fishermen, has an internal horny 

 " pen," and the Cuttle has a spongy, calcareous bone. 



