130 



CRUSTACEA PERACARIDA 



CHAP. 



male, and upon which the female organisation is imposed as the 

 parasitic habit is assumed. 



The following is a list of the Epicarida with the Crustacea 

 which serve as their hosts l : 



Cryptoniscina- 



'Microniscidae on Copepoda. 



Cryptoniscidae on O.stracoda. 



Liriopsidae on Eliizocepliala. 



on 



Hemioniscidae 

 Cabiropsidae 

 Podasconidae 

 Asconiscidae 



Cirripedia. 

 Isopoda. 



Bopyrina 



fDajidae 

 I Phryxk 



lae 



xidae 

 Bopyridae j 

 Entoniscidae J 



on Amphipoda. 

 on Schizopoda. 



on Decapoda. 



Iii all cases the first larval form which hatches out from the 



maternal brood-pouch is called the 

 Epicaridian larva (Fig. 85). 



This little larva has two pairs 

 of antennae, a pair of curious frontal 

 processes, and a pair of mandibles. 

 The other mouth-parts are missing ; 

 there are only six thoracic limbs, 

 but the full complement of six 

 biramous pleopods are present, and 

 at the end of the body there may 

 be a long tube of unknown function. 



FIG. 85. Epicaridian larva, probably As a type of the Cryptoniscina 



S^ndt^f^ we "^ take "> 1-iriopsidaer 



abdominal appendages ; T, thor- parasitic on the RMzocephala, 



after a Han n seS S ) eS ' rom Bolmier ' which are, of course, themselves 



parasitic on the Decapoda, the whole 

 association form ing a very remarkable study in Carcinclogy. 



Almost every species of the Khizocephala is subject to the 

 attacks of Liriopsids, the latter fixing either on the Khizocephala 

 themselves, or else on the Decapod host at a point near the 

 fixation of the Ehizocephalous parasite. An exceedingly com- 

 mon Liriopsid is Daimlin curvata, parasitic on Sacculina neglecta, 



s. Inst. Zool. Lille, viii., 1900. 

 - (}. Smith, FiiiniK mnl Flora Neapel, Monograph 29, chap. vi. ; M. Caullery, 

 Mink. Zool. Stat. Ncapel, xviii., 1908, p. 583. 



