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Show 46 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, postero-lateral margin. Arms smooth; wrist with a long spine on its inner margin. The slender terminal joints of the legs are longer than the preceding joints. Length of carapace and rostrum barely 3 lines. A single female example was collected at Matoya, at a depth of 65 fms. This specimen is of very small size ; but in the form of the fifth ambulatory legs it appears to be generically distinct, both from Homola and Tymolus, an allied genus from the Japanese seas, described by Stimpson ; from the former genus it is further distinguished by the form of the eyes, and from the latter by that of the front, which is not quadridentate. RANINIDEA. RANINA SERRATA. Cancer raninus, Linn. Syst. Nat. (ed. xii.), p. 1039 (1766). Ranina serrata, Lam. Syst. An. sans Vert. p. 256 (1801); M.- Edw. Crust, in Cuvier, Regne Animal (ed 3), Atlas, pi. xii; Dana, U.S. Expl. Exp. xiii. Crust, i. p. 404 (1852). Ranina dentata, Latr. Encycl. Meth. p. 268 (1825); M.-Edw. Hist. Nat. Crust, ii. p. 194, pi. xxi. figs. 1-4 (1837); De Haan, Faun. Japon., Crust, p. 139, pi, xxxiv. <5 adult, pi. xxxv. fig. I, § adult, figs. 2 & 3, front of tf, fig- 4, front of $ (1841). A single individual, a male, was collected in Olvasi, Nipon, of moderate size, of this well-known species, which appears to be widely distributed through the Indo-Pacific region. LYREIDEUS TRIDENTATUS? Lyreideus tridentatus, De Haan, Faun. Japon., Crust, p. 140, v. fig. 6 (1849). A single specimen in imperfect condition was collected in Kada Bay, which 1 refer to De Haan's species with some doubt, as it differs in several particulars from the figure in the ' Fauna Japonica,' and the figures illustrating this work are, as a rule, most accurate. The carapace in the specimen before m e is proportionally narrower, barely equalling in width half the total length. The greatest width at the lateral spines is attained at a greater distance from the front than in the specimen figured by De Haan ; the median triangular lobe of the front is narrower; and there are four spines on the inferior margin of the hand. If the species should prove upon comparison to be distinct, it may be designated L. elongatus. It in any case forms an interesting and valuable addition to the national collection, in which the genus was hitherto unrepresented ; nor does it appear that any specimens were collected in the United States Expedition to the North Pacific, as none are mentioned in Stimpson's Report. PORCELLANIDEA. PORCELLANA SPINULIFRONS, sp. n. Two small specimens are in the collection, the exact locality |