THE ENTONISCIDA 407 
The embryo has a nauplian eye, and swims with the sixth 
pair of trunk-feet extended. 
Grapsion Cavolinu, Giard (1878), on Pachygrapsus mar- 
moratus, Fabricius. This species is named after Cavolini, 
who in 1792 described an Entoniscid from ‘ Granchio de- 
presso,’ which is supposed to be the same as Pachygqrapsus 
marmoratus. 
Cancrion, Giard and Bonnier, 1886. Parasitic on 
Cancridz. The female has the marsupium closed when 
adult, and has four dorsal ovarian bosses. The sheath in 
which the animal is enclosed is always covered with thick- 
enings of yellow chitin. ‘The male has the pleon clearly 
distinct from the perzeon, elongate, without ventral pro- 
minences or terminal hooks, the bilobed apex of the sixth 
segment being minutely squamose. The embryo has the 
sixth trunk-feet elongate and carries them extended 
laterally. 
Cancrion cancrorum (Fritz Miiller, 1864), on several 
Brazilian species of Xantho, implying ew hypothesi several 
species of parasite under one name. Fritz Miiller states 
that the heart in the male is situated in the third segment 
of the pleon. 
Cancrion miser, Giard and Bonnier, 1886, on Pilumnus 
hirtellus (Linn.) Six specimens were found. ‘The crabs 
examined were more than 1,800. 
Cancrion floridus, Giard and Bonnier, 1886, on Xantho 
meisus, Leach, commonly called Xantho floridus (Montagu). 
Three specimens were found to about 900 crabs examined. 
Portunion, Giard and Bonnier, 1886. Parasitic on 
Portunide. The female has the marsupium closed when 
adult, the ascendant lamella of the first pair of plates 
regularly widened from the base, much recurved, the 
upper edge not cut; there are two medio-ventral and two 
latero-dorsal ovarian bosses. The male has medio-ventral 
hooks on the pleon, and the sixth segment apically fur- 
nished with a pair of hooks. The embryo is without a 
nauplian eye, and swims with the sixth trunk-feet carried 
under the pleon. 
Portunion meenadis, Giard, 1886, on Carcinus menas 
