A GROUP OF ROCK-LOYERS. 



21 



finger, so I will 

 not give it here, 

 but will advise 

 those of you who 

 wish to look it up 

 to study the List 

 of Figures at the 

 end of this book, 



or to consult the Figure 4. 



books on shells in your school library. 



The shell is too small to be of much use as a 

 tent to the little creature that carries it, since it 

 covers only a small portion of his back. There 

 ^^^^ are a few other kinds, not commonly found, 

 ^^^ and for a description of these I would also 

 Figures, refer you to the books on shells. 



Of the common limpets, — those that have no 

 chimney-holes, — there are so many kinds that it 

 is sometimes very difficult to be sure of the right 

 name. Figures 1 and 6 show the shape of the 

 Ribbed Limpet, which is gray in color and lives 

 on the highest cliffs. Most of 

 the specimens of it that you find 

 will be smaller than tlie picture. 



On the rocks between the tide ^^^^''^ '• 



limits, you may find a number of different kinds; 

 some like Figure 7, — the Plate Limpet, — ^ others 



