HALF AN HOUR WITH SHELL-FISH. 



185 



tooth-powder! All the members of this family, 

 recent and extinct, are carnivorous. Their long 

 arms, as shown in Fig. 99, are formed by a splitting 

 up of the margin round the head into eight parts, 

 popularly termed "feet;" hence the name of the 

 animal, Octopus " eight-footed." By means of these 

 arms or feet (for they are made to do duty for both) 

 the cuttle-fish can crawl along the sea-bottom, 

 head downwards, and search there for its prey. 

 When observed with the arms less actively occupied, 



Fig. 100. 



Loligopsis. 



it will be noticed that the body indicates something 

 like proportionate moulding (Fig. 100, Loligopsis). 



