414 A HISTORY OF RECENT CRUSTACEA 



Eisso's obscure descriptions entitle him to honour or grati- 

 tude. In the present instance, it is said, he mistook the 

 tail of the parasite for its head, and considered the appen- 

 dages of the pleon to be ramified plumose antennae. 

 Evidently Latreille was puzzled by the description, for in 

 1825, under the genus ' Ichthyophile (Cymotlwa, Leach),' 

 he says, ' L'ergina cervicornis de M. Bisso me parait etre 

 tin ichthyophile, ayant accidentellement un corps etranger 

 (algue ?) aux antennes.' In this species it is observed 

 that ' the colour of the ovary and consequently that of the 

 largest part of the body is of a brilliant carmine red.' 



Gigantione, Kossmann, 1881. The female has an 

 almost circular outline, all the segments having un- 

 branched prolongations. The three-jointed first antennas 

 have the basal joint expanded so as to cover the oral 

 region, just leaving space for the protrusion of the points 

 of the mandibles. The tiny feet have a short pointed 

 nail. The marsupial plates are very large. The first 

 pleopods form acuminate sacks with sparingly ramified 

 out-growths on the surface ; the following pairs are small, 

 entirely ramose. The male has the pleon distinctly seg- 

 mented, with six pairs of oval sack-like pleopods. 



Gigantione Moebii, Kossmann, 1881 (see Plate XVIII.). 

 in Riippellia impressa, de Haan. 



lone, Latreille, 1818. The female has the side-plates 

 well developed on the head and perason, those of the first 

 five segments of the pleon arborescent, coralloid, the ap- 

 pendages of the sixth segment simple, cylindrical, recurved 

 at the extremity. The male has the second antennas seven- 

 jointed, and the pleon furnished with six pairs of long 

 cylindrical appendages. 



lone thoracicus (Montagu, 1808), in Gallianassa sub- 

 terranea (Montagu), was first recorded from Devonshire. 



lone cornutus, Spence Bate, 1864, in Callianassa longi- 

 mana, Spence Bate. 



lone vicina, Giard and Bonnier, 1890, in Gallianassa 

 truncata, Giard and Bonnier. 



lone gebice, Giard and Bonnier, 1890, in Upogebia stellata 

 (Montagu). 





