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Show 1879.] THE COREAN AND JAPANESE SEAS. 47 whence they were obtained not being stated. They differ from the description of P. latifrons Stimpson (Proc. Ac. Nat. Sci. Phil. p. 243, 1858), only in the following particulars. There are only two spines on the lateral margins of the carapace in front of the branchial regions, and one behind the outer orbital spine. The denticulations of the frontal lobes are very minute, but more numerous than in P. latifrons-about 9 on the median lobe and 4 on each lateral lobe ; there are only two spines on the posterior margin of the carpus. It is possible that a larger series would show these differences are not of specific importance. PACHYCHELES STEVENSII. Pachycheles stevensii, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 242 (1858). Two specimens are in the collection, without definite locality (male and female). This species was previously unrepresented in the collection of the British Museum. Stimpson's specimens were from the west coast of the island of Jesso, Japan. With one exception (the P. natalensis, Krauss) the only species of this genus, besides the two described by Stimpson, inhabit the American coasts-another indication of the affinity existing between its Crustacean fauna and that of the Japanese seas. LITHODIDEA. HAPALOGASTER DENTATUS. Lomis dentata, De Haan, Faun. Japon., Crust, p. 219, pi. xlviii. fig. 3 (1849). Hapalogaster dentatus, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 245 (1858), A single specimen, female, in mutilated condition, was collected at the Goto Islands at low-water mark. It agrees well with a specimen from Simoda, presented to the British Museum by the Smithsonian Institution. This species belongs to a genus which, having a boreal range, is found on the west coast of the American continent as well as on the shores of Eastern Asia. An allied species, H. mertensii, has been described by Brandt from Sitka, and a third, H. cavicauda, by Stimpson from California. CRYPTOLITHODES EXPANSUS, sp. n. The species which I have thus designated is represented only by a single small specimen in dried condition. The carapace is transversely oval, with the lateral wing-like expansions broadly rounded, the surface everywhere minutely punctulated. The rostrum is scarcely at all deflexed, truncated, and but very obscurely trideu-tate at its distal end. There is a convexity upon the gastric, and one more prominent upon the cardiac region, on either side of which is a less elevated tubercle, the three forming a transverse series. A longitudinal median ridge extends from the gastric prominence |