CRABS AND INSECTS. 



FIG. loo. Hermit out of the shell, showing soft abdomen, r, hardened 

 ridge which bears against the inner edge of the aperture of the shell ; 

 a, a, appendages to which the eggs are attached. (After Morse.) 



FIG. ioi. Hermit-crab in the shell of a sea-snail. (After Emertono 



