122 



THE CRUSTACEA 



-MX 



I 



\ 



Fia. 73. 



Larval stages of Balunus. a, late nauplius stage ; b, metanauplius, just about to pass into 

 the Cypris 'stage; A, anus; A', antennule ; A", antenna; D, intestine; Dr, fronto-lateral 

 gland ; F'-F^, the six thoracic appendages of the Cypris stage beneath the cuticle of the meta- 

 nauplius ; Ff, frontal filament ; H, fronto-lateral horn ; Mil/, mandible ; MX, maxillula ; 0, 

 laired eye of Cypris stage ; 0', nauplius-eye ; 01, upper lip, turned forward in a. (From Claus's 



