I30 



CRUSTACEA PERACARIDA 



male, and upon wliich the I'eiuale 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 ^ : — 



/"Microniscidae 

 Cryptoniscidae 

 Liriojjsidae 

 Cryptoniscina-j Hemioniscidae 

 Cabiropsidae 

 Podasconidae 



vAsconiscidae 



Bojiyrina 



TDajidae 

 I Pliryxidae 



^Bopyridae 

 Entoiiiscidae 



Copepoda. 



Ostracoda. 



Rliizocepliala. 



Cirripedia. 



Isopoda. 



Ainphipoda. 



Schizopoda. 



on Decapoda. 



In 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. 



As a type of the Cryptoniscina 

 we may take the Liriopsidae," 



Fig. 85. — Epicaridian larva, probably 

 belonging to one of the Crypto- 

 niscina. .1, 2nd antenna; Ab, . . -ni • 



abdominal appendages ; T, thor- parasitic OU the EhlZOCCphala, 



acic appendages. (From Bonnier, ^^j^j^^i^ ^^ COUl'Se, themSClveS 



after Hansen.) ' ' 



parasitic on the Decapoda, the whole 

 association forming a very remarkable study in Carcinology. 



Almost every species of the Ehizocephala is subject to the 

 attacks of Liriopsids, the latter fixing either on the Ehizocephala 

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

 fixation of the Ehizocephalous parasite. An exceedingly com- 

 mon Liriopsid is Danalia curvata, parasitic on Sacciilina ncglecta, 



^ Bonnier, Trans. Inst. Zool. Lille, viii., 1900. 



^ G. Smith, Fauna and Flora Nca2)el, Monograph 29, chap. vi. ; M. Caullery, 

 Mitth. Zool. Slat. Ncaiyel, xviii., 1908, p. 583. 



