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Show 32 MR. E. J. MIERS ON CRUSTACEA FROM [Jail. 14, Stimpson's specimens of P. hirsutus were collected in the North- China sea and near Ousima Island. PILUMNUS DEHAANII, sp. n. The carapace is broader than long, convex, and everywhere covered with a close velvety pubescence, so that no traces of the regions are visible. Antero-lateral margins shorter than the postero-lateral, and armed with three small spines (excluding that of the outer orbital margin, which is not at all prominent). The orbital margins and the front (seen in a dorsal view) are minutely denticulated. In an anterior view the frontal margin is sinuated, with a median notch. The anterior legs are short, robust, the right slightly the larger; the arm trigonous and very short; the wrist with a few conical acute granules on its anterior and upper surface; the palm smooth on its inner, and armed on its upper and all its outer surface with numerous, crowded, unequal, conical, acute tubercles ; fingers acute, meeting when closed, the upper granulous at base. The ambulatory legs are slightly compressed and hairy. Length 3\ lines, breadth 4\ lines. The single specimen, a female, was found within the shell of a species of Balanus collected in the Gulf of Yedo. This species, on account of the closely pubescent carapace and form of the hands, has more of the aspect of an Actumnus than of Pilumnus, but differs in the acute fingers and spiniform antero-lateral teeth from that genus. I cannot refer it to any of the numerous published descriptions. It is readily distinguished by the nearly equal and closely tubercu-lated hands, the tubercles extending halfway along the mobile finger and covering the outer surface of the hand to the apex of the immobile finger. The fingers are nearly colourless. From the P. ac-tumnoides of M . A. Milne-Edwards from New Caledonia (Nouv. Arch. Mus. H . N. ix. p. 247, pi. x. fig. 3, 1873), to which it bears some resemblance, it is at once distinguished by the fewer lateral marginal teeth, &c. It has also some affinity with the Pilumnus setiger and P. squa-. mosus of De Haan, which have been referred by M. A. Milne- Edwards, rightly 1 believe, to Actumnus. From the former it differs in the regions of the carapace being obliterated, and from the latter in the conical (not squamiform) tubercles of the hands, which are not seriately disposed ; from both, probably, in the spiniform marginal teeth. PoRTUNIDiE, THALAMITA SIMA. Thalamita sima, Milne-Edw. Hist. Nat. Crust, i. p. 460 (1834); Stimpson, Proc. Ac. Nat. Sci. Phil. p. 39 (1858); A. M.-Edw'. Arch. Mus. Hist. Nat. x. p. 359 (1861). Portunus (Thalamita) arcuatus, De Haan, Faun. Japon., Crust. pp. 10, 43, pi. ii. fig. 2, pi. xiii. fig. 1 (1835). A female example was collected of this species, which seems to |