OCR Text |
Show 1879.] THE COREAN AND JAPANESE SEAS. 37 This species is distinguished by the form of the front, which at base is about one fourth the width of the carapace, with the sides slightly converging to the distal extremity, the margin of which is nearly straight. The oblique ridge on the inner surface of the larger hand is distinctly granulated ; the fingers are not sulcated externally ; and their inner margins are simply granulated without teeth or lobes in the adult. In younger individuals there is a very small tubercle or granule in the middle of the inferior margins. It is probable that the species figured by Milne-Edwards under the name of G. lacteus (I. c.) is to be referred to a distinct species, as the lower finger has a distinct subterminal tooth. This species has been hitherto unrepresented in the national collection, as the specimen purchased by the Trustees as from the Leyden Museum under this name, and referred to by White (List Crust. Brit. Mus. p. 36, 1847), belongs to Milne-Edwards's first section of the genus, and is identical with the G.forcipatus of Adams and White. GRAPSID^E. H E T E R O G R A P S U S LONGITARSIS, sp. n. (Plate II. fig. 3.) Carapace nearly as long as broad, quadrate, the surface somewhat uneven and sparsely hairy; the frontal margin straight, without a median sinus; the postfrontal lobes distinctly marked, the lateral margins straight, not arcuated anteriorly as in most species of the genus, and with three prominent acute teeth. The outer maxillipeds have the third joint not dilated at its antero-external angle, and the exognath narrow as in other species of the genus. The anterior legs are clothed with short pubescence, not robust; wrist with a small spine on its inner margin ; hand with a longitudinal raised line on its outer surface, and with a patch of hair on its inner surface in the males; fingers straight. Ambulatory legs slender, compressed, with short close hair disposed in longitudinal series ; the tarsal joints of all the legs long and slender. Postabdomen of male nearly as in H. penicillatus. Length and breadth about | inch. Otarranai, lat. 43° 12' N., long. 141° 1' E., at 5j fathoms, bottom coarse sand (three males and a female); Yokoska Dock, in Gulf of Yedo, one young individual taken from the ship's bottom ; and in lat. 33° 12£' N., long. 129° 5' E., at 9 fathoms, one young male. This species is at. once distinguished from the Japanese H. sanguineus and H. penicillatus, De Haan, and most species of the genus, by the narrower hairy carapace with straight sides, and the slender elongated tarsal joints of the fifth ambulatory legs ; in these characters it approaches the genus Cyrtograpsus, in which genus, however, the outer maxillipeds leave a wider hiatus when closed, and the lateral .margins of the carapace are 4-dentated. PLATYGRAPSUS DEPRESSUS, junior ? Platynotus depressus, De Haan, Faun. Japon., Crust, pp. 37, 63, pi viii. fig. 2(1835); M.-Edw. Ann. Sci. Nat. (ser. 3) Zool. xx. p.'199 (1853). |