. The British woodlice, being a monograph of the terrestrial isopod Crustacea occurring in the British Islands. Crustacea -- Great Britain; Oniscidae; Anthropoda; Invertebrates. THE BRITISH WOODLICE. 2t Genus—hlGlDlUM Brandt, 1833 (3), p. 173 Zia, Koch (34). Abdomen navvoiv; habitat, wet moss. In Ligidinni there are numerous joints to the flagellum, lateral lobes are absent from the head, and t'ne tail appendages are com- pletely to be seen. AH the segments of the abdomen are distinctly narrower than those of the thorax and in this it agrees with Trichoniscns, Tiiclioniscoides, Philoscia, and
. The British woodlice, being a monograph of the terrestrial isopod Crustacea occurring in the British Islands. Crustacea -- Great Britain; Oniscidae; Anthropoda; Invertebrates. THE BRITISH WOODLICE. 2t Genus—hlGlDlUM Brandt, 1833 (3), p. 173 Zia, Koch (34). Abdomen navvoiv; habitat, wet moss. In Ligidinni there are numerous joints to the flagellum, lateral lobes are absent from the head, and t'ne tail appendages are com- pletely to be seen. AH the segments of the abdomen are distinctly narrower than those of the thorax and in this it agrees with Trichoniscns, Tiiclioniscoides, Philoscia, and Metoponorthus. In these, however, the flagellum has never more than seven joints, the tail appendages (as in all genera but Ligia and Ligidium) are partially hidden by the last segment, and in all the four but Philoscia there are lobes to the heath Ligidium hypnorum, Cuvier. Plaie II. 1792 Oiiiscus hypnoiiijii CxivKT (g),'p\ XXVI., figs. 3—5. 1793 Oniscxii agilii Persoon, quoted by Koch in Panzer (51), part 5, pi. XXIV. 1830 Ligia hypnorum Hose (2). p. 179. 1833 Ligidium persoonii J. F. Brandt (3I, p, 174, pi. IV., figs. 6—7. 1840 Zia agilis Koch (34), part 34, pis. XXII. and XXIII. 1844 Ligidium personii Zaddach (77), p. 17. 1853 Ligidiinn personii Lereboullet (39), p. 14, pi. I., fig. I, pi. II., figs. 20—31. 1857 Ligidium personii Kinahan (32), p. 275, pi. XXI., fig. 14, pi. XXII., fig. g. 1873 Zia saundersii Stebbing (70), p. 286. 1873 Ligidium anile Norman (48), p. 419. 1885 Ligidium hypnnrnm Buiide-Lund (8), p. 254. 1898 Ligidium kypiiorum G. O. Sars (59), p. 158 pi. LXXI. only British This species, which like the last, is the representative of its genus, was added to our fauna in 1873 ^y the Rev. Thomas R. R. Stebbing (70) who found specimens in the neighbourhood of Copthorne Common, Surrey. Up to the present time, when we are pleased to announce that we discovered it in the spring of 1902 at Warley in Essex, Ligidium hypnorum has not been recorded from any other
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