CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 75 



the edge of the fifth lateral tooth. Interantennary front broad and 

 projecting-, laminiform, very slightly convex; margin waved, indis- 

 tinctly trilobate, the median lobe smallest- Frontal region somewhat 

 depressed and sparsely granulated. Basal joint of antennae highly 

 movable, its antero-interior angle scarcely meeting the front ; antero- 

 exterior angle dentiform and lying in the hiatus of the orbit. Chelo- 

 poda above and below scabrous with slight transverse ridges ; hand 

 short, costate exteriorly, and with a spine at the summit near the 

 articulation of the dactylus. A strong sharp spine at the summit of 

 the carpus. Aleros with a slight tooth at its inferior extremity. 

 Dactylus of the posterior or natatory feet lanceolate ; the margin 

 ciliated with long hairs. 



Colors : Carapax dark purplish-brown with a large white patch 

 in the middle ; sometimes white with a purplish patch. Feet nearly 

 white except toward their extremities. Dimensions : Length of cara- 

 pax, 0.28 ; breadth, 0.3 inch. The specimens described are perhaps 

 immature. 



Dredged from a shelly bottom in twenty fathoms in Kagosima 

 Bay, Southern Japan. 



Genus SCYLL.A. De Haan 



108. SCYLLA TRANQUEBARICA' (Fabricius) Dana 



Poriunus tranquebaricus Fabricius. 



Portunus serratits Ruppell, Krabben des rotlien Meeres, p. 19, pi. 11, fig. I. 



Lupa tranquebarica Milne Edwards, Hist. Nat. des Crust., i, 448. 



Scylla serrata De Haan, Fauna Japonica, Crust., p. 44. Kr.\uss, Sudafr. 



Crust., p. 25. 

 Scylla tranquebai'ica D.-xna, U. S. Expl. E.xped., Crust., i. 270, pi. .\vi, fig. 6. 



There are two sufficiently distinct varieties of this species. That 

 figured by Riippell, in which the frontal teeth are sharp, is found 

 on the shores of the continent of Asia, chiefly in muddy estuaries. 

 It may be seen in great numbers in the markets of Hongkong and 

 Canton. The colors in living individuals an^ as follows : Carapax 

 olive green above, white below ; hands often reddish, and spotted 

 with green exteriorly, fingers always red; feet pale greenish, with 

 darker spots below. 



In Dana's variety ocean ica the frontal teeth are blunt, with the 

 median incision deepest ; and the posterior tooth of the antero-lateral 

 margin is longer than in the other variety. This form is found 

 among the Pacific Islands, and was taken by us at Loo Choo. 



^ Scylla serrata (Forskal). 



