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 ' :— 
Microniscidae on Copepoda. 
Cryptoniscidae on Ostracoda. 
Liriopsidae on Rhizocephala. 
Cry sa Sain SFRGLAT Sete Grripedi 
ryptoniscina, Hemioniscidae on  Cirripedia. 
Cabiropsidae on Isopoda. 
Podasconidae on Amphipoda. 
Asconiscidae on Schizopoda. 
f Dajidae | 
Bopyrina : Spiers - on Decapoda. 
| opyridae | 
Entoniscidae 
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. 
Fic. 85,—Epicaridian larva, probably AS a type of the Cryptoniscina 
nisthia Ay Sl anténin ;40, Oo) a aes eee 
abdominal appendages ; 7, thor- parasiti¢ on the Rhizocephala, 
a ape (From Bonnier, which are, of course, themselves 
parasitic on the Decapoda, the whole 
association forming a very remarkable study in Carcinclogy. 
‘Almost every species of the Rhizocephala is subject to the 
attacks of Liriopsids, the latter fixing either on the Rhizocephala 
themselves, or else on the Decapod host at a point near the 
fixation of the Rhizocephalous parasite. An exceedingly com- 
mon Liriopsid is Danalia curvata, parasitic on Sacculina neglecta, 
1 Bonnier, Trans. Inst. Zool. Lille, viii., 1900. 
2G. Smith, Fauna and Flora Neapel, Monograph 29, chap. vi. ; M. Caullery, 
Mitth. Zool. Stat. Neapel, xviii., 1908, p. 583. 
