AN OLD NAME REVIVED 413 
first four segments are three-branched, of the fifth two- 
branched, all coarsely fringed. 
Grapsicepon messoris (Kossmann, 1880), in Metopo- 
grapsus messor (Forskal). 
Grapsicepon Hritzi, Giard and Bonnier, 1887, in a 
Brazilian Grapsus (Leptograpsus ruqulosus ?). 
Grapsicepon Hdwardsi, Giard and Bonnier, in Planes 
minutus (labricius), found occupying both sides of the 
same host. 
Cancricépon, Giard and Bonnier, 1887. The female has 
the feet ending in a short sharp claw, the adhesive pro- 
cesses rudimentary, the ovarian bosses numerous. The first 
five segments of the pleon are laterally three-branched, 
the dorsal branch tuberculose; the sixth segment carries 
two long appendages. ‘The male has the first antennee 
three-jointed, the second five-jointed ; the pleon segmented, 
carrying very rudimentary pleopods; the sixth segment 
has some rough hairs or little wrinkled scales. 
Cancricepon elegans, Giard and Bonnier (1886) (see 
Plate XVIII.), in Pelumnus hirtellus (Linn.). The Pilum- 
nus is abundant at Wimereux among the vast collections 
of tubes of Sabellaria alveolats. In about one per cent. 
of the times that the parasite was found, it occurred on 
both sides of the same crab. The authors once. found 
this species and Cancrion miser on the same specimen of 
Pilumnus. They compare the central prolongation of the 
pleon in the embryo with that in the embryos of some 
Cirripedes and Merostomata. 
Cancricepon silula, Giard and Bonnier (1886), in 
Xantho incisus, Leach. 
Eirgyne, Risso, 1816. The female has the adhesive 
processes strong and muscular, the pleon appendages 
fringed, the first five two-branched, the sixth simple. The 
male has the maxillipeds rudimentary, the pleon without 
distinct segments or appendages. 
Lrgyne cervicornis, Risso, 1816, in Portunus arcuatus, 
Leach. Giard and Bonnier identify Portunicepon portuni 
(KKossmann, 1881) with Risso’s species, so that the restora- 
tion of Risso’s generic name seems inevitable, little as 
