METAMORPHOSIS OF CRUSTACEA. 



195 



place, and the zoea passes into the mysis form (5) ; the antennse cease to serve as organs of locomotion, 

 their place being taken by the thoracic feet, which are furnished with long hairs or bristles. The 



Fig. 9. METAMORPHOSIS OF A PRAWN OF THE GENUS Petiteus. (After Fritz Mutter.) 



, adult, h-K natural size ; 2, nauplius stage of young Prawn as it quits the eep ; 3, zoea of same Prawn ; 4, older zoea of same species ; 5, myiis 



of ditto. (. 3, 4, and 5, are all magnified forty-flve diameters.) 



