METAMOEPHOSES OF THE CRUSTACEA. 



281 



In the Op OS sum -shrimps (Mysls) the young does 

 not leave the pouch of the mother until it is fully 



Fig. 73. Pen-ania semimlcatus. A, adult (after de Haan. h nat. size) ; 

 B, ZoEea, and C, less advanced Zoeea of a species of Pcricctis. D, 

 Nauplius. (B, C, and D, after Fritz Miiller.) 



