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Show 56 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, variety of the planirostris ; or the differences may be those peculiar to the male sex. HlPPOLYTE LEPTOGNATHA, var. 1 Hippolyte leptognatha, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 34 (1860). Rather slender. Carapace dorsally carinated, the carina reaching nearly to the posterior margin ; anterior margin with two small spines below the eye, and another at the antero-inferior angle. Rostrum elongated, longer than the carapace, its apex reaching beyond the end of the shorter thickened flagellum of the antennules ; its upper margin straight, horizontal, and 6-dentate, the two or three last teeth situate on the dorsal crest, inferior margin with about six small and crowded teeth. The postabdomen is strongly geniculated. The outer maxillipeds slender and elongated, reaching nearly to the apex of the rostrum. Anterior legs rather slender; the palm longer than the fingers, and rather longer than the wrist. Wrist of second pair of legs 7-jointed, the second and sixth joints shortest, and the third joint the longest. Only one of the following legs exists in the specimen before me; in this the merus joint is armed with a series of spinules on its inferior margin, the penultimate joint is long, and the last joint short. The single specimen, a female with ova, was collected in the Gulf of Yedo, and is in a mutilated condition. It agrees in so many particulars with Stimpson's description of H. leptognatha, from Hakodadi, that I have not ventured to consider it distinct; as will be seen from the description, however, it differs in the more numerous teeth of the rostrum, of which fewer are placed on the dorsal surface of the carapace. PANDALUS GRACILIS. Pandalus gracilis, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 37 (1860). A single specimen was obtained in the Korean Straits, in lat. 34° 8'N., long. 126° 24' E.; temp, of water 71°, at a depth of 17 fathoms. It is in a very mutilated condition, the legs being imperfect and rostrum broken at the tip ; but it agrees well with Stimpson's description and a specimen presented by the Smithsonian Institution from Hakodadi. PEN^EIDEA. PENJEID^;. PENCEUS AFFINIS, M.-Edw. Penceus affinis, M.-Edw. Hist. Nat. Crust, ii. p. 416 (1837) ; De Haan, Faun. Japon., Crust, p. 192, pi. xlvi. fig. 3, barbatus on plate (1849); Miers, Proc. Zool. Soc. p. 304 (1878). Penceus velutinus, Dana, U.S. Expl. Exp. xiii., Crust, i. p. 604, pi. xl. fig. 4 (1852). r V One male individual, was collected in lat. 32° 49' N., long. 128° 54' E. b |