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Laurie, 1906

Carapace rounded quadrilateral, but the side margins are only slightly divergent backwards; the dorsal surface smooth and convex fore and aft but less so from side to side. The antero-lateral borders indistinctly converge into the postero-lateral; both are finely granular and fringed with hairs. The front is subequal in width to the length of the eyestalk, divided into two rounded lobules by a well marked median sinus. The eyes are fixed, the pigment of cornea only remains as a minute point near the distal extremity of the eyestalk. The antennal flagellum is thickly plumed with feathered hairs. Chelipeds are short and symmetrical, the palm is compressed and has its upper inner border sharply crested, the outer surface being covered with depressed granules, which are usually of worn-appearance. The first pair of ambulatory legs are a little smaller than the other pairs, which are subequal with their anterior and posterior borders fringed with yellowish, silky hairs; the merus is proximally broadened, especially in the last pair, which is dorsally deviated. (T. Sakai, 1939: 573)

Type locality: Sri Lanka.
Range: Persian Gulf (Stephensen, 1945); Sri Lanka (Laurie, 1906); Japan - Misaki (Yokoya, 1936), Sagami Bay and Shimoda (Sakai, 1939), Sagami Bay (Sakai, 1965b), Sagami Bay, Izu Peninsula and Tosa Bay (Sakai, 1976a), Ogasawara-shoto (Takeda, 1977a), Shiono-misaki (Takeda, 1979a), off Matsuyama, Seto Inland Sea (Takeda et al., 2000); Gulf of Thailand (Rathbun, 1910a); Indonesia - Kepulauan Aru (Tesch, 1918b), off Doe Roe, Banda Sea (Serène, 1964).

Mertonia lanka