back, a sprinkling of bristles and hooked hairs. The 

 reason for this is plain when we consider the fact 

 that oftentimes the female is so loaded with eggs 

 that the mass is sufficient to push back her abdom- 

 inal flap almost in a line with the back. 



It now remains to consider something concern- 

 ing the intelligence of spider-crabs as we find this 

 capacity featured in the case of Little Lena. 



If, in a previous part of this paper, I have given 

 the impression that the masking reflexes indicated 

 that ?ione of the spider-crab's actions is performed 

 by conscious effort, my thesis has been misinterpre- 

 ted. We do not yet know enough about so intimate 

 a thing as is the human organism to predicate the 

 properties of the brain; no one with certainty, 

 then, can say what are the mental operations of a 

 crab. But that crabs do have some sort of psychism 

 apart from automatic reflexes, which is like that 

 of humans, there can be no doubt. And the degree 

 of intelligence possessed by various individuals 

 differs just as it does among mankind. Indeed, one 

 of the first things to strike the observer of these 

 crustaceans is the decided contrast in behavior be- 

 tween the different members of a tank. Some will 

 seem downright stupid; others, again, will be 



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