_Ireland_: Dublin; (Kinahan, 32): Foyle District; Donegal; Galway; Clonbrock, Co. Galway; Mornington, Co. Meath; Santry; Gleeson Park; Dundrum, Co. Dublin; Bray; (R.F.S.) _FOREIGN DISTRIBUTION:--_ _Europe_: Practically all the Countries of Europe are given in Dollfus' list; (23). _Asia_: Japan; China; Syria; Ceylon; Sumatra; Celebes; Phillipines; Caucasus; Himalayas; (23): Christmas Island; (B.M.) _Africa_: Generally distributed; Madagascar; Seychelles; (23). _Atlantic Isles_; (23). _America_: North and South, almost everywhere, to judge from M. Dollfus' list; (23). _Australia_: New Caledonia; (23). =Metoponorthus cingendus= Kinahan. PLATE XX. 1857 _Porcellio cingendus_ Kinahan (32), p. 279, pl. XIX., figs. 1468-9. 1868 _Porcellio cingendus_ Bate and Westwood (1), p. 489. 1885 _Metoponorthus simplex_ Budde-Lund (8), p. 188. The colour of _Metoponorthus cingendus_ is steel blue with red or yellowish spots. It has a raised line across each thoracic segment and its abdomen is narrower than in _Metoponorthus pruinosus_. [Illustration: FIG. 54.--FLAGELLUM AND LAST PEDUNCULAR JOINT OF THE ANTENNA OF _Metoponorthus cingendus_.] _BRITISH LOCALITIES:--_ _England_: Salcombe, Devon; (Norman, 49): South Devon; (Stebbing in 49). _Ireland_: Dublin; (B.M. from Kinahan); Mountain Districts of Dublin, Wicklow, and Cork; Coast of Kerry; Arran Islands; Achill, Co. Mayo; Roundstone, Co. Galway; Mallow, Caef Island; Glandore; Brock Haven, Co. Cork; Killoughrim Forest, Co. Wexford; Kenmare, Co. Kerry; (R.F.S.). _FOREIGN DISTRIBUTION:--_ _Europe_: France; (25): Spain; (12). (2.) Able to roll up into a ball. _Genus_--=CYLISTICUS= Schnitzler, 1853 (65), p. 24. _Flagellum, with two joints; abdomen broad; frontal lobe, very small._ The characters given immediately above are almost those of _Porcellio_ with which _Cylisticus_ might, perhaps, be confounded. The latter has the power, however, of rolling itself into a ball, and the first segment of the thorax is comparatively larger than in any species of _Porcellio_, indeed the side plates of the segment in question entirely flank the head. These features, as well as the straight sides of the body and the arched back, connect _Cylisticus_ with _Armadillidium_, from which the former is, however, at once separated by its long pointed tail appendages. =Cylisticus convexus= De Geer. PLATE XXI. 1778 _Oniscus convexus_ De Geer (10), p. 553, pl. XXXV., fig. 11. 1833 _Porcellio spinifrons_ Brandt (3), p. 177. 1836 _Porcellio laevis_ Koch (34), part 6, pl. I. 1853 _Porcellio armadilloides_ Lereboullet (39), p. 65. pl. I., fig. 18. 1853 _Cylisticus laevis_ Schnitzler (65), p. 25. 1868 _Porcellio armadilloides_ Bate and Westwood (1), p. 485. 1898 _Cylisticus convexus_ Sars (59), p. 186, pl. LXXXI.