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Show 748 MR. W. F. LANCHESTER ON CRUSTACEANS [Jline 19, there is another small tooth between the first two spines, and an even smaller one between the second and third. Dr. de Man (Mergui, Crust. I. c) says : " The outer and upper surfaces of the hands of G. affine are covered with short hairs, whereas in the specimen of G. cruciferum " (i. e. the only one obtained from the Mergui Archipelago) " their surfaces are perfectly glabrous and smooth." In this example of G. affine, their surfaces are nearly smooth in the case of the left chelipede, which is smaller than the right; the carpi are in both cases externally hairy. Dim. 35x24. XL. Genus SCYLLA de Haan. 65. SCYLLA SERRATA Forskai. Cancer serratus, Forskai, Descr. Anim. p. 90 (1775). Cancer olivaceus, Herbst, Naturgesch. d. Krab. ii. p. 157, pi xxxviii. f. 3 (1794). Portunus tranquebaricus, Fabr. Suppl. Ent. Syst. p. 366 (1798). Lupea tranquebarica, M.-Edw. Hist. Nat. Crust, t. i. p 448 (1834). V Portunus (Scylla) serratus, de Haan% Crust. Japon. p. 44 (1839). Scylla serrata, A. M.-Edw. Arch. Mus. t. x. p. 349 (1861); Hasw. Cat. Austr. Crust, p. 79 (1882) ; Henderson, Trans. Linn. Soc, Zool. vol. v. p. 372 (1893). Hab. Singapore ; one large male, caught in the fishing-stakes used by the natives, about 3-6 fms. Dim. 152x102. XLI. Genus THALAMITA Latr. 66. THALAMITA CRENATA Latr. Portunus crenatus, Latr. Coll. du Museum. Thalamita crenata, Riipp. Krab. d. rothen Meeres, pi. 6, p] i f. 2 (1830); M.-Edw. Hist. Nat. Crust, t. i. p. 461 (1S34). ThdUimita prymna, var. crenata, Kossmann, Zoolog. Ergebn., Malacostraca, p. 48 (1877). Thalamita crenata, de Man, Mergui Crust, p. 79 (1S88). Hob. Singapore; from the nets of native fishermen. Three females. I note the following variations:- Specimen A. The 4th antero-lateral tooth on the left side is only represented by a prolongation of the posterior edge of the tooth in front; thus forming one enormous tooth, completely filling the normal positions of the 3rd and 4th teeth. Right side normal. Posterior border of penultimate joint of last legs dentate. Specimen B. Normal, except for denticulation of the posterior border of the penultimate joint of the last legs. Specimen C. Penultimate joint of last legs denticulate; carapace, chelipedes, and posterior surface of last legs thickly covered with short hairs. Dim. $ 67x44. $ 60x39-5. $ 53x35-5. |