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Show 1879.] THE COREAN AND JAPANESE SEAS. 55 brevirostris, Olivier, and A. lobidens, De Haan, and the A. and A. rapax, Fabricius, as described and figured by the latter-mentioned author in the 'Fauna Japonica.' From the A. brevirostris it differs in the absence of crests upon the upper surface of the larger hand, the finger of which is proportionally much longer, and nearly straight, and from the three other species in the absence of ridges on the outer and inner surface of the palm, and of spines at the distal extremity of the arm, &c. It is evidently very nearly allied to A. rapax, which, however, is described (De Haan, I. c.) as having "manus major glabra 4-costata, brachia carina superiore apice linispinosa.,, I dedicate this species to Mr. J. S. Kingsley, of Salem, U. S., who, by his recent researches, has greatly facilitated the determination of the American species of this genus. ALPHEUS GRACILIPES? 1 Alpheus gracilipes, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 31 (I860). I refer to this species with some hesitation a small individual collected in lat. 32° 49' N., long. 128° 54' E. It agrees in all particulars with Stimpson's description, based on a specimen from Tahiti, except that the orbits can scarcely be called acute in front, and the penultimate joint of the ambulatory legs is about 6-spined below. I may add that the larger hand is sparsely pilose and slightly twisted, the mobile finger about one third the total length of the hand. The smaller hand is wanting in the specimen. RHYNCHOCYCLUS PLANIROSTRIS. Cyclorhynchus planirostris, De Haan, Faun. Japon., Crust, p. pi. xiv. fig. 7 (1849). Rhynchocyclus planirostris, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 27 (1860). Rhynchocyclus mucronatus, Stimpson, I.e. p. 28 (1860), var. One adult female, with ova, was collected at Cape Sima, Nippon, at a depth of 18 fathoms, on a bottom of sand and broken shells, and one, apparently male, in the Gulf of Yedo. It is to be noted that in neither specimen is the wrist carinated above and spinose at apex, as in De Haan's description. In all other respects the female, however, agrees with the description and figure of that author. The second specimen, in the somewhat narrower longer rostrum, and the existence of but a single spine on the dorsal surface of the carapace, agrees with Stimpson's diagnosis of R. mucronatus, which was based on specimens collected in the Strait of Ly-i-moon, near Hong Kong; but the denticles on the anterior margin of the rostrum are more numerous in both individuals. In both, moreover, exist the spines on the anterior margin of the carapace, mentioned by Stimpson; and in both the joints of the wrist are of the same proportional length, i. e. the second longer than either the first and third. It is probable that Stimpson's species is at most a mere |