OCR Text |
Show 38 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, Platygrapsus depressus, Stimpson, Proc. Ac. Nat. Sci. Phil. p. 104(1858). Two small specimens (male and female) are in the collection. These differ from the description and figure of De Haan, and from an adult male of P. depressus in the British-Museum collection, in the existence of a small spine on the wrist at the antero-internal angle ; and the posterior tooth of the lateral margins of the carapace is obsolete in one, and very obscurely indicated in the other specimen. The hands are slenderer, and the fingers straight and regularly denticulated on their inner margins, whereas in the adult male the fingers are arcuate and the upper has on its inner margin near the base a large and prominent tooth. Matoya, 6| fathoms; lat. 34° 13' N., long. 136° 73' E., 48 fathoms. This species is a common inhabitant of the Chinese and Japanese seas. The generic name instituted by De Haan, Platynotus, having been previously employed, was changed by Stimpson to Platygrapsus. A second species, P. convexiusculus, described by Stimpson from the Loo-Choo Islands, is scarcely sufficiently distinguished by the characters given. The genus Platygrapsus is distinguishable from Heterograpsus and other allied genera, with which it has affinities and which are represented in the Japanese seas, by the form of the second and third joints of the outer maxillipeds, which are obliquely articulated with one another, whereas in those genera the margins along which the articulation takes place are at right angles with the lateral margins of the joints. HELICE TRIDENS. Ocypode (Helice) tridens, De Haan, Faun. Japon., Crust, 57, pi. xi. fig. 2, and pi. xv. fig. 6 (1835). Helice tridens, M.-Edw. Ann. Sci. Nat. (ser. 3), Zool. xx. p. 189 (1853) ; Stimpson, Proc. Ac. Nat. Sci. Phil. p. 105 (1858). E. Japan, Yamada, lat. 39° 32' N., long. 141° 53' E., at depth of 7 fathoms; bottom sandy, with broken shells. A single specimen, an adult female, in the collection. Length 1 inch, breadth nearly 1 inch 4 lines. This fine species was previously unrepresented in the British- Museum collection. LEIOLOPHUS PLANISSIMUS. Cancer planissimus, Herbst, Naturg. Krabben u. Krebse, lix. fig. 3 (1804), v Plagusia clavimana, Desm. Consid. Crust, p. 127, pi xiv fig 2 (1825) ; M.-Edw. Hist. Nat. Crust, ii. p. 92 (1837). ' Acanthopus planissimus, De Haan, Faun. Japon., Crust, p. 30 |