364 A HISTORY OF RECENT CRUSTACEA 
spite of the projecting uropods and even of the pereon- 
process, they roll about with great facility. The projections 
from the body promote their resemblance to the weed 
among which they live. Campecopea lineata, Hesse, 
taken ‘under stones, near Brest,’ seems to be the same 
species. 
Cilicea, Leach, 1818, has the front or median part of 
the pleon dorsally produced into a long spine in the male, 
but not in the female. The apex of the pleon is notched 
as in Cymodoce. 
Cycloidara, Stebbing, 1878 (Cyclura, Stebbing, 1874, 
preoccupied), has the pleon wider than the preceding 
part of the animal, a peculiarity which it shares with very 
few of the Isopoda.. The large oval branches of the 
uropods are of unusually thin texture, and are very salient, 
the movable outer branch folding only partially beneath 
the fixed inner one. The Australian type-species, Cycloi- 
dura venosa, has the seventh segment of the pereeon pro- 
duced into a large dorsal spine, at least 
in the male. A new genus near to Cycloi- 
duru may be required for the Californian 
species, Spheroma amplicauda, Stimpson. 
Isoclidus, Miers, 1876, rather closely 
resembles the preceding genus, but has 
the uropods ‘ subequal, of a slightly sig- 
moid shape, and acute at the extremity.’ 
? ‘The spine of the seventh perzeon-segment 
“ is not developed in the female. The 
species, armatus (Milne-Edwards) and 
spiniger (Dana), are from New Zealand. 
Ceratocephalus, Woodward, 1877, has 
the head produced in the male into three 
large processes of which the central is 
much the longest. Inthe female ‘ faintly 
Fic. 31. — Coratocepta. Marked projections’ take the place of the 
lus Grayanus, Wood- processes. The terminal segment of the 
ward [Haswell]. ° ° E 
pleon is produced in an obtusely pointed 
process beyond the uropeds, which are affixed high up on 
che sides of the segment, and have the outer movable branch 
