456 



CRUSTACEA MALACOSTRACA. 



Nebalia and its allies possess a peculiar interest in that while 

 theyjare not closely related to any, they unite in a remarkable 

 manner the characteristic features of several widely separated 



II 



FIG. 284. Nebalia Geoffroyi, strongly magnified (after Claus). a (female ; fe male ; D 

 intestine ; 6 vas deferens ; M crop ; O stalked eye ; R movable head plate ; S shell. 

 The flagellum of the first maxilla is directed dorsally in a, ventrally in 6. 



orders. They thus appear to represent in a little modified form 

 the crustacean stock in a primitive stage. 



The number and arrangement of the limbs is that characteristic 



