298 



CRUSTACEA. 



the still unsegmented abdomen is developed in the form of a flat 

 caudal plate. The spines of the dorsal shield recall the Protozoaea 

 stage of lAidfer. There is a long, forwardly-directed rostrum, a 

 short, unpaired median spine projecting backwards from the posterior 

 edge of the dorsal shield, wliile, springing from the sides, are two 



/ M -^-^ 



Fifi. 141. — Several consecutive Erichthoidina stages (after Claus). a', (irst antenna; a". 

 second antenna; a^-n^, the six pleopoda ; /-!', tlie five niaxillipedes ; 0, 7, S, the three 

 posterior thoracic segments whicli, in these stages, have no limbs. 



long postero-lateral spines (Fig. 141 A). Besides the Nauplius eye, 

 the paired stalked eyes are found on either side of the rostrum below 

 the dorsal shield. The two pairs of antennae are still short and 

 uniraniose. The mandible has no palp, and the two pairs of maxillae 

 are present in a very rudimentary condition as small lobes. The five 



