18 THE HAUNTS OF LIFE 
(Euspongia), found in the Mediterranean, 
the West Indies, and Australia, often grows 
at depths readily reached by a long fork. 
SIMPLEST ANIMALS.—Very abundant on 
some shores are almost microscopic chalk- 
forming animals or Foraminifers which glide 
about on seaweed by means of outflowing and 
retractile threads of living matter. In all the 
pools and shore-waters there are many kinds 
of Infusorians, which propel themselves rap- 
idly by means of lashes of living matter (cilia 
or flagella). 
Any book on shore Natural History will 
supply information about the animals on our 
list. The meaning of the list is just to show 
that the shore gives hospitality to a very rep- 
resentative assemblage of animals. We add a 
scheme of classification, which may be useful 
at different parts of our study, to show how 
certain animals stand in relation to others. 
A DIFFICULT PLACE TO LIVE IN 
The school of the shore is a hard school. 
It must be an interesting and stirring place to 
live in, but no one could call it easy. There 
