_Ireland_: Corcumroe Abbey; Co. Clare (Norman, 50). _FOREIGN DISTRIBUTION:--_ _Europe_: France; (25): Norway; Prussia; Germany; Bohemia; (59). =Haplophthalmus danicus= Budde-Lund. PLATE VIII. 1870 _Haplophthalmus elegans_ Budde-Lund (6), p. 228 (not _Haplophthalmus elegans_ Schöbl). 1879 _Haplophthalmus danicus_ Budde-Lund (7), p. 9. 1881 _Haplophthalmus mengii_ Weber (76), p. 192, pl. V., figs. 7-9 (not _Itea mengii_ Zaddach). 1885 _Haplophthalmus danicus_ Budde-Lund (8), p. 250. 1898 _Haplophthalmus danicus_ Sars (59), p. 168, pl. LXXIV., fig. 2. This species was added to the British list by the Rev. Canon Norman (49), who found a colony in his garden at Berkhamsted. It has rows of tubercles on its thorax instead of ridges, and there are no ribs at all upon the abdomen. The front of the head projects further comparatively and forms a more acute point than in _Haplophthalmus mengii_ and it is not so purely white in colour as the latter species. [Illustration: FIG. 42.--FLAGELLUM AND LAST PEDUNCULAR JOINT OF THE ANTENNA OF _Haplophthalmus danicus_.] _BRITISH LOCALITIES:--_ _England_: Warley Place; (W.M.W. from Miss Willmott): Queen's Cottage, Kew Gardens; Stanmore; Hanwell, garden at Odstock, Bennett's Nurseries; (W.M.W.): Berkhamsted; (Norman, 49): Sunderland; (Brady, 50a). _FOREIGN DISTRIBUTION:--_ _Europe_: France; (25): Denmark; Holland; Germany; (Dollfus, Feu de Jeun, Nat., April, 1896): Norway; (Sars, 59). _Section_--=ONISCI.= THE OUTER DIVISIONS OF THE TAIL APPENDAGES BROADER THAN THE INNER ONES. _Family_-ONISCIDÆ. =Tail appendages projecting when the animal is walking.= (1.) Unable to roll up into a complete ball. _Genus_-=ONISCUS= Linné 1746 (41), p. 360. _Flagellum, with three joints; abdomen broad; head with lateral lobes._ The characters given above taken in conjunction with the size of the animals will serve to distinguish the members of this genus. =Oniscus asellus= Linné (The "Common Slater.") PLATE IX. 1761 _Oniscus asellus_ Linné (41), p. 500, No. 2058. 1792 _Oniscus murarius_ Cuvier (9), p. 22, pl. XXVI. 1838 _Oniscus fossor_ Koch (34), part 22, pl. XXII. 1868 _Oniscus asellus_ Bate and Westwood (1), p. 468. 1868 _Oniscus fossor_ Bate and Westwood (1), pp. 471-2. 1898 _Oniscus asellus_ Sars (59), p. 171, pl. LXXV. _Oniscus asellus_ is one of the largest of our woodlice and it is also probably the commonest, though _Porcellio scaber_ is in many places quite as abundant. The body of _Oniscus_ is broad and expanded and the colour is usually a slate grey with yellowish markings more or less regularly arranged.