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") and the four anterior ambulatory limbs {tli^-tJi^) have 

 appeared as small biramose rudiments. Besides these, rudiments of 



Fio. WQ.—Protozoaeac and Zoam of Lucifer (after Brooks). A, first Protozoaea stage. B, first 

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

 E, ^:o((ea stage, o', first antenna; a", second antenna; ah^, sixth pair of pleopoda (lateral 

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

 md, mandible; )«/', first maxillipede; m/", second niaxillipede ; m/'", third maxillipede ; 

 mj), protopodite of the third pair of maxillipedes ; mx', first maxilla ; mx", second maxilla ; 

 0, paired compound eye ; oc, Nauplius eye ; ol, upper lip ; r, rostrum ; th^-Vf^, rudiments of 

 the first four pairs of ambulatory limbs ; <!-«■*, the four segments carrying ambulatory 

 limbs ; 1-G, the six abdominal segments. 



