■Hi ■ • . . ' .•■!■ . . . -".Ji- 



A:-'.' ;•; J^.'i-'iv-K^fe&vV.i/^v^s^h 



Fig. h%.—AxUims ^»!'?«(i7is.— Surface views of the earlier stages in the develfii)iiient of 

 the embryo, from tlie apjiearance of the blabtojuire (A) to the assumiition of tlie 

 uauplius form (F) (after Reicheiibaeh, X about 2::;). 6j), blastopore ; c, carapace ; }g, 

 fore-gut involution ; /i., lieart : lig, liinJ-gut involution ; Ih, laVirum ; mtj, medullary 

 groo\e ; o, optic pit ; j), enilodennal plug partly tilling lip the blastopore ; }«■, jiro- 

 ceplialic processes ; *o, abdominal elevation ; 2, antennules ; 3, antenna; 4, man- 

 dibles. 



