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Show 1879.] THE COREAN AND JAPANESE SEAS. 41 me in 1877 as Leucosia perryi, and which is distinguished from P. tridentata by the smooth and polished carapace, which is defined by a continuous marginal beaded line. (See Trans. Linn. Soc, Zool. i. p. 238, pi. xxxviii. figs. 19-21, 1877.) The genus Leucisca of MacLeay (Annulosa in Smith's Zool. S. Africa, p. 70, 1838), which resembles Leucosia, and in which no mention is made of the existence of a thoracic sinus, differs from Pseudophilyra and Leucosia in having the exognath of the outer maxillipeds robust and curved, and the eyes placed on either side at the base of the front, not at the antero-external angles. PSEUDOPHILYRA TRIDENTATA, sp. n. (Plate II. fig. 4.) Carapace (with front) longer than broad, very coarsely punctulated except on the frontal region, where the punctulations are very fine. Frontal margin tridentate, the front itself narrowed and mnch produced, as in the genus Leucosia. There is a distinct elevation on the hepatic region, and immediately in front of it a marked depression. A minutely beaded line defines the posterior and posterolateral margins of the carapace, becoming obsolete on the anterolateral margin. The inferior surface of the body is smooth ; the exognath of the outer maxillipeds is rather broad, but its outer margin nearly straight, not arcuated as usual in Philyra. The postabdomen of the male has all the joints except the last coalescent, but the sutures are not entirely obliterated. Colour light brownish-pink. Length 4£, breadth 4 lines. One specimen, a male, was collected in lat. 33° 4' N., long. 129° 18' E., in 23fms. In this specimen the legs are unfortunately wanting ; an anterior leg that was in the same phial, and probably belongs to the specimen, has the arm very finely tuberculated, wrist and hand smooth, fingers slightly gaping at base when closed. PHILYRA, sp. Several specimens (males and females) of a species of Philyra, on account of their small size (their length is only about 3 lines), I do not designate by a distinct specific name, as they may not be fully matured. They resemble Ph. platycheira, De Haan, in the form of the carapace, which is nearly smooth and marked with a distinct depression between the cardiac and branchial regions, in the very finely granulated arms, &c. The anterior legs, however, are much shorter than in that species, the palm shorter and more swollen, and the fingers less compressed. The pterygostomian region is not angulated, and the intestinal region rather convex. From the P. pisum described by De Haan this species differs in the non-angulated pterygostomian region, from the P. tuberculosa, Stimpson, from Hong- Kong, in the non-tuberculated carapace, and from the P. unirlentata, Stimpson, from the China Sea, in the form of the front. It may not improbably be a distinct species from any hitherto described. Collected at Matoya, in 6| fms. |