CRUSTACEANS 



49 



is, like most of the group, covered with stiff hooked 

 bristles and these serve as an anchorage for the weeds, 

 etc., with which the crab bedecks itself. Despite its 

 almost negligible mentality it shows an astonishing 



Spider Crab {Pisa) dressing itself with seaweed 



intuition as to the fitness of its disguise. A crab finding 

 itself among green weeds for example neatly cuts off 

 sections with its pincers and chews the ends of the fragments 

 in order to obtain a better grip. The chewed end is then 

 planted firmly amongst the bristles, where it takes root, 



