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 A HISTORY OF SUSSEX Leonards, in brackish water affected by land drainage.' ' S. rugicauda. Leach, distinguished from the preceding by a pair of longitudinal ridges on the pleon, I have myself found in company with it in marshy ground near the sea at Worthing. Dymmene viridis. Leach, from Fairlight,^ has the distinction of being very common and very obscure, no one as yet having arrived at any certainty as to its proper generic or specific name. In another family, Asellidaj, the freshwater Asellus aquatkus (Linn.) is reported common,' and so it is probably in all our counties. From the neighbouring family Janirids, Mr. Guermonprez notes also as common the marine species 'J antra maculosa^ Leach, and "Jeer a albifrons. Leach, the latter of which has recently been identified by Sars with the form named Oniscus marinus by Otho Fabricius in the Fauna gronlandtca, so that it must now be called Jara marina (O. Fabricius). Of the terrestrial Isopoda, or woodlice, the often quoted Natural History gives under the heading Oniscids the species Lygia oceanica, rare ; Philoscia muscorum, very common ; Platyarthrus hoffmannseggii, not uncommon ; Oniscus asellus, common ; Porcellio scaber, common ; Armadillo vulgaris, very common ; * with the addition in the First Supplement of Philougria riparia, Koch, from Hastings.^ A more precise classification would give the earlier Trichoniscus pusillus, Brandt, in place of P. riparia, assigning this to the family Trichoniscids, and Ligia oceanica (Linn.) to the Ligiids, allotting Armadillidium vulgare (Latreille) to the Armadillidiidje, and leaving in the Oniscidas Porcellio scaber, Latreille, Philoscia muscorum (Scopoli), Oniscus asellus, auctorum, and Platyarthrus hoffmannseggii, Brandt. This last little pallid frequenter of ants' nests I have found at Cissbury Camp near Worthing. Mr. Guermonprez informs me that Porcellio dilatatus, Brandt, is also found in Sussex. Concerning the Amphipoda, a group abounding in species, exu- berant in individuals, and distributed in endless diversity over all seas, there is little occasion to speak here at length. They have not yet attracted interest on the Sussex coast. After mentioning the freshwater Gammarus pulex (Linn.) and Corophium longicorne from the Cuckmere district as local and very common,^ the Natural History of Hastings adds nothing to its catalogue in this department till its Third Supplementary List in 1898, the accretion in twenty years being limited to Caprella linearis (de Geer), noted as somewhat rare.' Corophium longicorne, a mud burrowing species, with the second antennas much longer than the first, and a habit of revolving in its burrow, should rather be called Corophium volutator (Pallas). Caprella linearis is one of the linear skeleton shrimps, of which the specific name should preferably be backed by some details of the structure, for, struck by the filiform aspect of these curious objects, each fresh observer is apt to take for granted that the species before him must be C. linearis, although there are several linear species besides that. Of these, Phtisica marina. Slabber, is now reported by Miss H. F. Davies from ' British Sess'tk-eyed CrusUiaa, ii. 411. 8 The Nat. Hist, of Hastings, First Supplement, p. 45. ^ Loc. cit. p. 45. 262
 * p. 4'. ^ P-45- * P-4'- ' P- 22-