(a) 

 Fig. 5. The structure of the earthworm cuticle. The cuticle is 

 removed from the animal and subjected to layer-stripping to 

 expose the structure at various depths in the cuticle, (a) Middle 

 layers of earthworm cuticle, (b) Underneath surface of the external 

 corpuscle layer of the cuticle (bv kind permission of Dr. K. M. 



Rudall). 



facing p. 14 



