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Show 736 MR. W. F. LANCHESTER ON CRUSTACEANS [June 19, XXII. Genus LOPHOZOZYMUS A. M.-Edw. 39. LOPHOZOZYMUS EPHELITICUS Linn. Cancer epheliticus, Linn, (fide auctor.). Xantho octodentatus, M.-Edw. Hist. Nat. Crust, t. i. p. 398 (1834); Jacq. et Lucas, Voyage au Pole du Sud, Crust, p. 23, pi. ix. f. 1 (Hombron et Jacq. tome iii. 1853). Lophozozymus octodentatus, Hasw. Cat. Austr. Crust, p. 58 (1882). Lophozozymus epheliticus, Walker, Journ. Linn. Soc, Zool. vol. xx. p. 109 (1887); de Man, Zoolog. Jahrb. Bd. viii. p. 518 (1895). Hab. Singapore; littoral. One male and three females: and one younger male. In these specimens 1 note the following variations :-In the adult male, the fissure in the dorsal crest of the merus of the chelipedes opens widely at the top in the left arm, being broader above than below, whereas in the right arm it is nearly closed above; and in the right arm of one of the females it is completely closed above. Further, in the females the two tubercles on the inner edge of the carpus show a tendency to unite and form a ridge with concave edge. In the right carpus of one it forms a tri-tuberculate ridge, in the left the posterior tubercle is rudimentary, lying at the base of the other : while on the right carpus of another the two are nearly obsolete, being only represented by a very small excrescence. Dim. d 56x36-5. 6 32-5x20. $ 64x41-5. $ 58-5x37-5. $ 56-5x37. 40. LOPHOZOZYMUS (LOPHOXANTHUS) LEUCOMANUS Lockington. Xanthodes leucomanus. Lockington, Proc. Calif. Ac. Nat. Sci. pp. 32, 100 (1876). Lophozozymus (Lophoxanthus) bellus, var. leucomanus, Miers, ' Challenger' Brachyura, p. 115, pi. xi. f. 1 (18S6). Hab. Singapore. I have no record of the depth. A male and a female. Colour of carapace grey-black, of legs white-yellow. I cannot but regard this as specifically distinct from L. bellus Stm., after comparing it with two examples of the latter that are in tbe Museum collection. Superficially, the carapace of L. leucomanus appears, and is actually, broader in proportion to the length than that of L. bellus, and the front projects much farther forward beyond the orbits. The result of this is that the crab has a definitely six-sided appearance, which is not seen in L. bellus. The antero-lateral margins also differ very considerably, for in L. leucomanus they are continued in front to a point below the orbits, making the hepatic regions somew hat concave; w hereas in L. bellus the margin is continued, at the same level, to the external orbital angle, and the hepatic regions are slightly convex. The rugosities of tbe carapace are also very distinctive in L. leucomanus, |
