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Show 756 MR. w. F. LANCHESTER O N CRUSTACEANS [June 19, XLIX. Genus VARUNA M.-Edw. 81. V A R U N A LITTERATA Fabr. Cancer litteratus, Fabr. Suppl. Ent. Syst. p. 342 (1798); Herbst, Naturgesch. d. Krab. iii. p. 58, pi. xlviii. f. 4 (1799). Varuna litterata, M.-Edw. Hist. Nat. Crust, t. ii. p. 95 (1837). Grapsus (Trichopus) litteratus, de Haan, Crust. Japon. p. 32 (1839). Varuna litterata, Hasw. Cat. Austr. Crust, p. 103 (1882) Henderson, Trans. Linn. Soc, Zool. vol. v. p. 391 (1893). Hab. Singapore; from off a floating log of wood. Two males and four females. The shape of the frontal margin is slightly variable. According to Herbst, it is " in der Mitte ein wenig aufgeschnitten " : and his figure shows it to be very distinctly concave. Of these specimens it is very slightly, yet distinctly concave in three ; in the other three it is straight. Dim. (a) With straight front. d 31-5 x 30. $ 26-5 x 25-75. $ 21 x 20. (b) With concave front. d 29 x 26-5. $ 30-5 x 28-5. $ 2575 x 25. L. Genus SESARMA Say. 82. SESARMA QUADRATA Fabr. Cancer quadratus, Fabr. Suppl. Ent. Syst. p. 341 (1798). Sesarma quadrata, M.-Edw. Hist. Nat. Crust, t. ii. p. 75 (1837); Hilgendorf, von d. Dec-ken Reise, p. 90, pi. iii. f. 3 c (1869). Sesarma quadratum, A. M.-Edw. Nouv. Arch. Mus. t. ix. p. 302 (1873). Grapsus (Pachysoma) quadratus, de Haan, Crust. Japon. p. 62, pi. viii. f. 3 (1839). Grapsus (Sesarma) affinis, de Haan, t. c. p. xxx. Sesarma aspera, Heller, Crust, der Novara Reise, p. 63, pi. vi. f. 1 (1867); de Man, Mergui Crust, p. 169 (188S). Sesarma quadrata, Henderson, Trans. Linn. Soc, Zool. vol. v. p. 392 (1893). Hab. Singapore ; taken from under decayed logs of wood on marshy ground a short distance from the sea. Two males: typical specimens of S. quadrata, with eleven tubercles on the dactyl. Sesarma aspera Heller I judge to be a variety of S. quadrata, and not distinct. Dim. d 19-5x16. d 14X 11-5. 83. SESARMA TJENIOLATA White. Sesarma tceniolata, White, List Crust. Brit. Mus. p. 38 (1847). Sesarma mederi, M.-Edw. Ann. Sci. Nat. t. xx. p. 185 (1853). Sesarma tceniolata, de Man, Mergui Crust, p. 181 (1888); id. Zoolog. Jahrb. Bd. ix. p. 166 (1897); Burger, Zoolog. Jahrb. Bd. vii. p. 615 (1894). |