4.1'1 A IIISTOEY OF RECENT CEUSTACEA 



Risso'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 pi eon to be ramified plumose antennae. 

 Evidently Latreille was puzzled by the description, for in 

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

 he says, ' L'ergina ceruicoryds de M. Risso me parait etre 

 un 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 antennae 

 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 veith 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 Moehii, Kossmann, 1881 (see Plate XVIII.). 

 in Buppellia impressa, de Haan. 



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

 well developed "n the head and peraeon, 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 antennae seven- 

 jointed, and the pleon furnished with six pairs of long 

 cylindrical appendages. 



lone ihoracicus (Montagu, 1808), in Callianassa suh- 

 terransa (Montagu), was first recorded from Devonshire. 



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

 Tnana, Spence Bate. 



lone vioina, Giard and Bonnier, 1890, in Callianassa 

 trunaata, Giard and Bonnier. 



lone gehice, Giard and Bonnier, 1890, in TJpogeiia stellata 

 (Montagu), 



