A FEW MORE MOLLUSKS. Ill 



And so it happens that a piddock that has once 

 made his house becomes a prisoner for life. 



But what does he care! He is safe and quiet, 

 and he can always pump in water with its food 

 and air for his daily use, and with that he is con- 

 tent. But his sphere of knowledge and activity 

 is very, very small. Are you not thankful that 

 yours is so much larger? 



BLACKBOARD WOKDS. 



Fucus (fu'ktig), vegetation (vej-e-ta'shtin), ancient (an'- 

 shent), chemicals ( kem'i-klz), Chiton ( ki'tdn), withal 

 (with-aT), carnivorous (kar-niv'o-rtis), Tyrian (tir'i-an), 

 chorus (ko'rtts), original (o-rij'i-nal), diameter (di-am'e- 

 ter), piddock (pid'ddk). 



Figure 71 



