A FEW MORE MOLLUSKS. 



105 



the point of a knife, you will 

 see that his body resembles 

 that of a limpet, though the 

 organs are more simple. 

 There is a mouth at one end, 

 a creeping and holding disk, 

 and a muscular mantle. The 

 poor fellow will probably curl 

 himself 



up in a 

 ball, if 



yOU Figure 60. 



do not put him back into 

 the water, and he may 

 strain so hard that he will 

 break some of his shells. 

 I say some of his shells, 

 for he has 

 eight of 

 them, al- 

 ways eight, 

 arranged 

 like the 

 shingles on 

 Among the 



Figure 61. 



the roof of a house. 



pebbles on the beach, you can often 



find single shells which came from 



Figure 62. 



