OCR Text |
Show 1879.] THE COREAN AND JAPANESE SEAS. 43 region. Anterior legs rather long and nearly smooth ; arm obscurely trigonous, but without prominent angles ; palm moderately convex ; fingers straight and acute. Postabdomen of male with all the segments except the last coalescent. Length 5| lines, breadth 6 lines. A male and female are in the collection, without definite locality. This species differs from most of the genus in the entire absence of tubercles upon the carapace. It has some affinity with Ebalia tuberosa, Pennant (E. pennantii, Leach), from the British seas, but differs in the uninterrupted lateral margins and in the form of the front, which in that species is concave. ERALIA MINOR, sp. n. This species resembles the preceding ; but the carapace is broader and very much more coarsely granulated on the frontal, cardiac, branchial, and intestinal regions and antero-lateral and postero-lateral margins. The front is slightly concave. The intestinal region is much less prominent, and there is scarcely any trace of longitudinal and transverse ridges ; the posterior and postero-lateral margin of the carapace is slightly revolute. Length 3 lines, breadth 3^ lines. Three males and one female were collected with the preceding; and all are of much smaller size than the fully-grown male of the preceding species, to which they bear much external resemblance. The distinctions, however, are not sexual, and appear too considerable for the two forms to be varieties of one and the same species. EBALIA BITUBERCULATA, sp. n. This species resembles the E. rhomboidalis; but the longitudinal and transverse ridges on the carapace and the depressions on the branchial region are much more strongly marked; in the centre of the carapace, upon the branchial region, are two distinct tubercles; the posterior margin is broader and straight, not bilobed. A single female example was obtained at 52 fms., in lat. 34° 12' N., long. 136° 28' E. CRYPTOCNEMUS PENTAGONUS. (Plate II. fig. 5.) Cryptocnemus pentagonus, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 161 (1858). A single male individual is in the collection, obtained at 36 fms., in lat. 33° 10' N., long. 129° 12' E., in June 1876. It has unfortunately lost all its legs, but agrees in all respects with Stimpson's description. This is a most interesting addition to the British-Museum collection, as only three species have been described, the present being the only one not figured hitherto, and that on which the genus was founded. A comparison of the figure now given with that of the C. holdsworthi described by me last year in Trans. Linn. Soc. (ser. 2), Zool. i. p. 241, pi. xxxviii. figs. 30-32, will show the differences in the form of the carapace and rostrum between the two species. |