PARASITIC ISOPODS 393 
Bopyridee 
Bopyriens oniens 
hry hula 
PF. 
Entoniscide ie 
Cryptoniscids 
Cabiropside 
Dajidze 
Cyproniscidz 
Microniscidze 
Microniscide parasitic on Copepoda. 
Cyproniscidee i », Ostracoda. 
Dajidee 9 », schizopoda. 
Cabiropsidee ct », Isopoda and Amphipoda. 
Cryptoniscide ,, », Cirripedia (chietly the parasitic). 
Entoniscide 55 » Brachyura. 
Bopyridz ws », Brachyura and Macrura. 
The Epicaridea are all, strictly speaking, external para- 
sites, although according to position on their host they may 
be classified as abdominal, branchial, or visceral. In those 
which inhabit the branchial chambers of other crustaceans, 
the form of the female becomes obliquely ovate, the convex 
side being on the right or the left, according as the animal 
occupies the right or left side of its host. In some genera 
(Kepon, Gyge, Tone), a right-hand female has the marsu- 
pial plates of the right side overlapping those of the left, 
while the reverse is the case in a left-hand female. The 
plates are so imbricated that the last of the five pairs is 
