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Show 1877.] CRUSTACEA, CHIEFLY FROM SOUTH AMERICA. 665 ARMADILLIDIUM, Brandt. A R M A D T L L I D I U M C K L A T U M , sp. n. (Plate LXVII. fig. 3.) Convex, very finely and closely punctulated and pubescent. Head transverse-oblong, closely encased in the first segment of the body, with the anterior margin reflexed, more prominent in the centre, and slightly sinuated toward the antero-lateral angles, which are not prominent. Eyes minute, placed close to the antero-lateral angles. First segment of the body somewhat larger on the sides than the rest, with the postero-lateral angles acute, the posterior margin slightly excavate; following segments with the posterior margins nearly straight. Segments of the tail short; third to fifth bent backward on the sides ; terminal segment broader than long, triangular. Terminal joints of the uropoda transverse when viewed from above. External antenna? with the last two joints (flagellum) together about as long as, but more slender than, the preceding joint, the penultimate much shorter than the terminal joint. Colour generally dark brown. Length about 4 lines, breadth 2 lines. Hab. Cayenne. ARMADILLO, Latr. ARMADILLO VULGARIS. Oniscus armadillo, Linn. Syst. Nat. (ed. xii.) p. 1062 (1766). Armadillo vulgaris, Latr. Hist. Nat. Crust, et Ins. vii. p. 48 (1804) ; Leach, Trans. Linn. Soc. xi. p. 376 (1815) ; Spence Bate and Westwood, Hist. Brit. Sessile-eyed Crust, ii. p. 492 (1868). Armadillidium vulgare, M.-Edw. Hist. Nat. Crust, iii. p. 184 (1840); Kinahan, Nat.-Hist. Rev. iv. p. 276, pl. xxi. figs. 3, 9-13 (1857). Hab. Cayenne. There are in the collection several examples of a species of Armadillo purporting to have been collected at Cayenne, in which, after a careful comparison with specimens of the common British Armadillo vulgaris, in the British-Museum collection, I a m unable to detect any distinctive peculiarity whatever. They agree in size, punctulation of the body, coloration, &c. With these specimens was sent a single example of a Myriopod, which to the inexperienced eye of a collector might, upon mere superficial examination, be easily mistaken for the same species as the Armadillo. M y friend and colleague in the Zoological Department, M r . A. G. Butler, informs m e that this is certainly the European Glomeris marginata, Olivier. It appears very probable that here (as in the case of Cymothoa oestrum) the locality of the specimen has been wrongly given. It is difficult to see how, in the case of the Arma-dillidi'i (terrestrial Isopoda living under stones, in moist earth, & c ), the same species could inhabit Europe and South America. This species is evidently very closely allied to the Armadillo pilularis of Say (Journ. Acad. Nat. Sci. Phil. i. p. 432, 1818), from North America, of which a single specimen, presented by Say, is in the British-Museum collection. In this specimen the terminal |