260 



CRUSTACEA. 



The completely developed limbs are the same as those of the 

 Protozoaea stage, but behind these we find that the third maxilli- 

 pede (mf" f ) and the four anterior ambulatory limbs (th l -t)fi) have 

 appeared as small biramose rudiments. Besides these, rudiments of 



\ 



B 



FIG. 119. Protozoaeae and Zoaea of Lucifer (after BROOKS). A, first Protozoaea stage. , first 

 maxilla of the same. C, second maxilla of the same. D, later Protozoaea stage (Erichthina). 

 E, Zoaea stage, a', first antenna; a", second antenna; ab G , sixth pair of pleopoda (lateral 

 portions of the caudal fin) ; en, endopo-lite ; ex, exopodite ; h, heart ; I, hepatic outgrowths ; 

 md, mandible; mf, first maxillipede; mf", second maxillipede; mf 111 , third maxillipede ; 

 mp, protopodite of the third pair of maxillipedes ; mx 1 , first maxilla ; mx", second maxilla ; 

 o, paired compound eye ; oc, Nauplius eye ; ol, upper lip ; r, rostrum ; tW-thi. rudiments of 

 the first four pairs of ambulatory limbs ; tM-*, the four segments carrying ambulatory 

 limbs ; 1-6, the six abdominal segments. 



