412 A HISTORY OF EECENT CEUSTACEA 



the same as Pleurocrypta galathece, Hesse, from which, 

 however, it is distinguished by the clearly segmented 

 pleon and rudimentary pleopods. 



Gygo, Cornalia and Panceri, 1861. The lateral pro- 

 longations of the pleon are simple, unless transiently 

 double in the young female. 



Gi/ge galathece, Bate and Westwood, 1807, on Galathea 

 squamifera, Leach, from the Channel Islands. 



Gi/ge branchialis, Cornalia and Panceri, 1861, on 

 Upogelia stellata (Montagu). In the branchial cavity of 

 the host the parasite here as in other instances has its back 

 turned to the host's body, the ventral side with the mar- 

 supial plates turned outwards. When the brood is far 

 developed, it causes a bulging of the host's carapace, by 

 which the whole parasitic family is securely retained. At 

 other times, as Dr. Fraisse observes, the sharp claws, which 

 would be unable to grasp the smooth carapace, curve back 

 to clutch the branchiae. 



Kepon, Duvernoy, 1840. The female has the feet 

 ending in an inflated joint, without claw. The adhe- 

 sive processes (supposed in general to represent the exo- 

 pods) are well developed, papillose, in the first four pairs, 

 rudimentary on the other three. The appendages of the 

 pleon are coarsely pinnate. 



Kepon typus, Duvernoy, 1840, on an unknown crab in 

 the Mauritius. 



Leidya, Cornalia and Panceri, 1861. The female has 

 the feet ending in a blunt claw, the adhesive processes 

 of all seven pairs nearly equal. The appendages of 

 the pleon form sharp finely-fringed branches. The male 

 has the first antennae three-jointed, the second seven- 

 jointed, the pleon segmented, carrying five rudimentary 

 pleopods and two long appendages on the sixth segment. 



Leidya distorta (Leidy, 1855), in Gelasimus pugilator, 

 Bosc. 



Gra/psioepon, Giard and Bonnier, 1887. The female 

 has the feet ending in a short sharp claw, the adhesive 

 .processes oval, not warty. The pleon appendages of the 



