METAMORPHOSES OF THE CRUSTACEA. 981 
In the Opossum-shrimps (Mysis) the young does 
not leave the pouch of the mother until it is fully 
Fe 
z 
3 
fF 
i 
Fic. 73. Penaeus semisuleatus. A, adult (after de Haan, } nat. size) , 
B, Zomwa, and C, less advanced Zowa of a species of Peneus. D, 
Nauplius. (B,C, and D, after Fritz Miller.) 
