NERKIS 



183 



recognijied by any one who travels along the coast. We may 

 see abrupt rocky promontories whose base stands in many 

 fathoms of water. Against such a wall of rock the restless sea 



Fig. 174. — A bit of the rocky shore, and its adhering organisms. At the left 

 some brown seaweed, at the right bunches of mussels lying in crevices of 

 the rock, in the centre and above iDarnacIes adhering to the rock. 



is ever hurling itself, wearing the rocks smooth by its repeated 

 beatings, and yet the crevices of these same rocks are occupied 

 by many kinds of animals. These are able to maintain 

 their place either by being rooted to the rocks, like the 



