530 



CRUSTACEA MALACOSTRACA. 



Amphion. The singular pelagic forms referred to this genus have a 

 transparent flattened carapace, and elongated thoracic appendages, recalling 

 the Phyllosoma larvae of the Loricata (cf. p. 535), though they differ from 



FIG. 324. Protozoaeae and Zoaea larva of Lcucifer. A, first protozoaea stage ; B, first maxilla 

 of the same ; C, second maxilla of the same ; 7), later protozoaea stage (Erichthina) ; 

 E zoaea stage ; a' first antenna ; a" second antenna : a& 6 uropods ; en endopodite ; 

 ex exopodite ; h heart ; I hepatic outgrowths ; md mandible ; mf, mf, mf" first, second 

 and third maxillipeds : mp'" third thoracic segment ; mx' first maxilla ; mx" second maxilla ; 

 O paired eye ; oc nauplius eye ; ol upper lip ; r rostrum ; t/ii-tlv 1 rudiments of the first to 

 the fourth trunk-legs ; t l -t* the segments carrying them ; 1-6 the six abdominal segments. 

 (From Korschelt and Heider, after Brooks.) 



them in the absence of a constriction in the cephalo -thorax. The first 

 thoracic limbs are maxillipeds and grouped with the oral appendages, apart 

 from the other thoracic legs. The latter are elongated biramous struc- 

 tures ; but the last (8th) is small and rudimentary in A. Reynaudii, 



