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. 



* p. 4'. ^ P-45- * P-4'- ' P- 22- 



262 



