THREE-SPINED SHRIMP. 



267 



shrimp ; and, secondly, those with the second leg much 

 shorter than the third, the PontopMli of Dr. Leach : and 

 even in the former group, the comparatively delicate and 

 imperfect structure of the second pair is very evident ; thus 

 proving, in a natural point of view, the generic identity of 

 the two groups. 1 ' 1 -Mag. of Nat. Hist. vol. viii. pp. 261, 

 265. 



