﻿CRABS, HERMIT-CRABS, AND OTHER CRUSTACEANS. 143 



to enable it to retain its hold on the shell, and the other ab- 

 dominal appendages are rudimentary or wanting on the right 

 side, or that side which comes most against the inside of the 

 shell, as if they had been worn off. Wherever the creature 

 goes, it drags the shell after it as a house. 



Fia. 133.— Hehmit-Ceab rf.moved from its Sheli, : r, Hardened Ridg'e which hoars against 

 the Inner Edge of the z^psrturo of the Shell ; a, a, Appendages to which the Eggs are 

 attached. 



As the hermit-crab grows, it passes through llie same 

 features of moulting which characterize the crustaceans gen- 

 erally. The shell which protects its soft defenseless abdomen 

 has, of course, no power of growth, and is abandoned when 



