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 

 sHghtly 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 ex- 

 ternally ; 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. lac tens (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.*. 

 Heterograpsus 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 maxil- 

 lipeds have the third joint not dilated at its autero-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 hne 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 h inch. 



Otarranai, lat. 43° 12' N., long. 141° l'E.,at .5| 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. san- 

 guineus s^nA 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 raaxillipeds 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 (18.53). 



