THE ENTONISCID^ 407 



The embryo lias a nanplian eye, and swims with the sixth 

 pair of trunk-feet extended. 



Grapsion Cavolinii, Giard (1878), on Pachygrcupsus mar- 

 morcdus, 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 Fachugrapaus 

 marmorahis. 



Cancrion, Giard and Bonnier, 1886. Parasitic on 

 Cancridae. Tlie 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 pergeon, 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. 



Gancrion cancrorum (Fritz Miiller, 1861), on several 

 Brazilian species of Xaritlio, implying ex hypothesi several 

 species of parasite under one name. Fritz Miiller stated 

 that the heart in the male is situated in the third segment 

 of the pleon. 



Gancrion miser, Giard and Bonnier, 1886, on Piluriinus 

 hirtellus (Linn.) Six specimens w^ere found. The crabs 

 examined were more than 1,800. 



Gancrion floricl'us, Giard and Bonnier, 1886, on Xaniho 

 incisus, Leach, commonly called XantJio floridus (Montagu). 

 Three specimens were found to about 900 crabs examined. 



Porhtnion, Giard and Bonnier, 1886. Parasitic on 

 Portunidse. 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 mcenadis, Giard, 1886, on Gairinus mcenas 



