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Show 672 MR. E. J. MIERS ON A COLLECTION OF [June 19, pl. xlvii. figs. 6, 7 (1825); M.-Edw. Hist. Nat. Crust, iii. p. 269 (1840); Regne Animal de Cuvier (ed. Crochard), Crust, pl. Ixv. fig. 1 ; Spence Bate and Westwood, Hist. Brit. Sessile-eyed Crust. ii. p. 274, footnote (1868). Hab. Peru. To this species I refer two specimens in the collection, numbered as coming from Peru (the largest an adult female, length 1 inch 5 lines), which agree in every respect with the specimens in the British- Museum collection, described by Leach as Cymothoa cestrum, from European seas. Like these specimens they have the anterior lobes of the first segment of the body broad, subtruncate, and produced to a level with the anterior margin of the head, which appears straight in a dorsal view, but is inflexed, and conceals the bases of the superior antennse; the joints of the peduncle slender, not dilated ; the thigh-joint of the fourth pair of legs produced in the form of an acute tubercle, which is most prominent in the younger animal, the same joint of the following legs greatly dilated posteriorly; the terminal segment transverse, the rami of the uropoda very small, subequal, &c. It is very improbable that the same species should inhabit the seas of Peru and Europe ; and I think it safer to conclude, as there are some species in the collection avowedly from the Mediterranean, that the label in this instance, as in the case of Armadillo vulgaris, has been misplaced, and that the true habitat of these specimens is European. No particulars are given of the fish on which they were parasitic. The West-Indian C. dufresnii, Leaeh, is very nearly allied to this species ; but the anterior lobes of the first segment of the body are not quite so squarely truncate, and the lobe of the thigh-joint of the fourth pair of legs is somewhat less prominent and acute. ANILOCRA, Leach. A N I L O C R A LJEVIS, sp.n. (Plate LXVIII. fig. 6.) Body regularly convex, oval; first six segments of the tail of equal width, terminal segment considerably broader. Head small, narrowed anteriorly, front narrowed, rounded, inflexed, and concealing the bases of the inner antennse. Eyes black, oblong. First segment of the body with the antero-lateral angles not at all prominent, postero-lateral angles rounded and entire ; second to sixth segments with the posterior margins nearly straight; seventh segment with the posterior margin regularly excavate, the postero-lateral angle broad, obtuse and rounded. Segments of the tail rounded on the sides, terminal segment with the posterior margin rounded. Epimerse or coxse small, of the second, third, and fourth segments obtuse, of the fifth to seventh segments subacute and somewhat spiniform. Superior (inner) antennse nearly reaching to the anterior margin of the first segment of the body, eight-jointed; first three joints (peduncle) larger than the succeeding. Inferior antennse 9-jointed, nearly reaching to the posterior margin of the first segment of the body, peduncle five-jointed, the fifth joint the longest. Rami of the |