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Show 1879.] THE COREAN AND JAPANESE SEAS. 31 from the typical A. tomentosus and the species or variety designated A. affinis by Dana (U.S. Expl. Exp. xiii. Crust, i. p. 198, pi. xi. fig. 3), from the Paumotu or Society Islands; yet I find no characters which would justify me in considering them a distinct species. LEPTODIUS EXARATUS, var. Chlorodius exaratus, A. M.-Edw. Hist. Nat. Crust, i. p. 402 (1834). Xantho affinis, De Haan, Faun. Japon., Crust, p. 48, pi. xiii. fig. 8 (1835). Two very small specimens of a Leptodius, without particulars regarding locality, appear to belong to a well-marked variety of the common L. exaratus, or even to a distinct species. As the specimens are immature, it is not advisable to give them a distinct specific name. The carapace is depressed, the areolets scarcely marked and somewhat eroded towards the front and antero-lateral margins; the three posterior antero-lateral marginal teeth are small and subacute, the others obsolete; the frontal lobes are broad, with the anterior margin straight, and they are separated by a very small median notch. The anterior legs have the wrist and hand very rugose on their upper and outer surfaces ; the ambulatory legs somewhat dilated and compressed, and the tarsal joints very narrow. Length 3 lines, breadth 4\ lines. ERIPHIID^E. PlLUMNUS HIRSUTUS. Pilumnus hirsutus, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 37 (1858). The large series collected agree in all respects with Stimpson's diagnosis. The outer orbital spine is smaller than the three spines of the antero-lateral margin, which are acute. The larger hand (which is usually the right, but in some individuals the left) is granulated on its upper, and in younger specimens more minutely on its outer, surface; the lower finger is usually in a straight line with the lower margin of the hand. The smaller hand is granulispinulous on its upper and outer surface. In one or two specimens the granules are fewer and more acute, and the lower finger forms a slight angle with the inferior margin of the hand. This is evidently a very common and abundant species in the Corean seas. Specimens were collected at seven different localities in or near the Corean Straits, at depths varying from 12-40 fathoms. It was, however, previously unrepresented in the British-Museum collection. I should have regarded this speeies as being synonymous with the Pilumnus minutus of De Haan (Faun. Jap., Crust, p. 50, pi. iii. fig. 2), which is very shortly characterized, were it not that the antero- lateral margins are described and figured as " 4-dentatis " (not spinose), and the orbits as " inermibus " by De Haan. |