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Show 742 MR. w. F. L A N C H E S T E R O N CRUSTACEANS [June 19, Chelipedes short, everywhere punctated, on the outside strongly so as to appear almost rugose, on the inside faintly so as to appear smooth in comparison. Merus trigonous, with a small double blunt tooth, subdistal, on its upper margin; carpus rounded, with a small double tooth internally; hand rather compressed, the punctse, externally, tending to a linear arrangement; fingers brown, rather short, dentate on the inner margin and externally unisulcate ; tips white and strongly excavate. The ambulatory legs are all carinated, in the following manner, on their upper margins: the merus has a simple carina with a slight groove on its outer aspect; in the carpal joint this carina is faintly sinuous, the groove is very distinct, and outside it may be seen a second low carina; this carina is even more distinct iu the fifth joint, until in the next it equals in size the first carina, and the two enclose the original groove between them. Thus the merus is unicarinate, the carpus obscurely bicarinate, and the remaining two joints distinctly bicarinate. The carapace and limbs in one female are of a deep red hue; in the males and the other female the limbs and under-surface only are red or pinkish, the carapace being white or yellow-white. This form is identical with one which Mr. Borradaile has referred to the genus Carpilodes in a recent paper (supra, page 586) and I too was at first inclined to refer it to that genus. But the differences it exhibits are very striking, namely, the depression of the carapace, the grooves on the subhepatic regions, the ridges of tbe endostome, and the carination of the ambulatory legs, while the lateral margins are much less curved than in Carpilodes. This combination of characters is also sufficient to separate it from Actcea; though I a m inclined now to regard it as more nearly related to that genus than to Carpilodes. Dim. d 8-5x5-75. d 8-5x5-75. $ 7'75x5-5 $ 9-25x6. XXXII. Genus ACTUMNUS Dana. 51. ACTUMNUS SETIFER de Haan. Cancer (Pilumnus) setifer, de Haan, Crust, Japon. p. 50, pi. f. 3 (1839). Actumnus setifer, A. M.-Edw. Nouv. Arch. Mus. t. i. p. 287, pi. xviii. f. 5 (1865). Actumnus tomentosus, Dana, U.S. Expl. Exped., Crust, pt. i. p. 243, pi. xiv. f. 2 (1852). Actumnus setifer, Miers, ' Alert' Crust, pp. 225-6 (1884); de Man, Mergui Crust, p. 47 (1888) ; Walker, Journ. Linn. Soc, Zool. vol. xx. p. 110 (1887). Hab. Singapore; 5-10 fms. Five adult males and a smaller female, and two young males. These were found in holes made in soft stones, which were brought up by the dredge. Dim. d 20-5x16. d 16x13. d 13-25x10-5. d 13-25 xlO-5. d 13-75x10-5. $ 12-75x10. |