AX OLD NAME REVIVED 413 



first four segments are three-branched, of the fifth two- 

 branched, all coarsely fringed. 



Ghra/psicepon messoris (Kossmann, 1880), in Metopo- 

 grapsus messor (ForskSl). 



Grapsicepon Fritzii, Giard and Bonnier, 1887, in a 

 Brazilian Grapsus (Leptograpsus rugulosns ?). 



Grapsicepon Edwardsi, Giard and Bonnier, in Planes 

 minutus (Fabricius), found occupying both sides of the 

 same host. 



Cancricepon, 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 antennas 

 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 Pilumnus hirteHiis (Linn.). The Pilum- 

 nus is abundant at Wimereux among the vast collections 

 of tubes of Sabella/ria alveolata. 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 Gancrion 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. 



Gcmcricepon pilula, Giard and Bonnier (1886), in 

 Xantho incisus, Leach. 



Ergyne, Bisso, 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. 



Ergyne cervicornis, Risso, 1816, in Portunus arcuatus, 

 Leach. Giard and Bonnier identify Portunicepon portuni 

 (Kossmann, 1881) with Risso's species, so that the restora- 

 tion of Risso's generic name seems inevitable, little as 



