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Show 574 MR. L. A. BORRADAILE ON CRUSTACEANS [May 22, those of the anterior; chelipeds much larger than the last three legs, nearly as long as the rostrum; fingers shorter than the palm, fairly stout, enclosing a space at the base, with interlocking teeth at the tip ; moveable finger with an isolated blunt tooth near the proximal end; walking-legs with the joints irregularly swollen ; dactyles somewhat sickle-shaped, bearing spines and a few hairs below." The third maxilliped and the abdomen of the male are shown in figs. 1 a and 1 b. Colour in spirit, white. Total length 13-5 mm. Length of carapace to base of rostrum 8-5 mm. Greatest breadth 7 mm. Funafuti; one male. Genus MENCETHIUS H. M.-Edw., 1834. 8. MEN.ETHIUS MONOCEROS (Latr.), 1825. Pisa monoceros, Latr. Encycl. x. p. 139 (1825). Mencethius monoceros, II. M.-Edwards, H. N. Crust, i. p. 339 (1834); Alcock, J. As. Soc. Beng. lxiv. 2, p. 197 (1895). Mencethius angustus, depressus, subserratus, tuberculatus, areolatus, and inornatus, Dana, U.S. Expl. Exped., Crust, i. pp. 121-125, pi. iv. figs. 5-7 & pi. v. figs. 1-3 (1852). Funafuti; two males. The carapace in both specimens has the tubercles low and rounded but fairly numerous. Subfamily PISIN*. Genus HYASTENUS White, 1847. 9. HYASTENUS ELEGANS Miers, 1886, var. (Plate XL. fig. 2.) Hyastenus elegans, Miers, ' Challenger ' Brachyura, p. 58, pi. vi. fig. 3 (1886). The specimens differ from the type in the following particulars :- 1. The horns are more slender and set wider apart at the base. 2. The larger tubercles of the carapace are more rounded ; not so sharp. 3. The arrangement of tubercles in the fore part of the carapace is somewhat different (see figure). Should it be thought advisable to give this variety a name, that of tenuicornis would be suitable. Rotuma; two males, one female. Genus TYLOCARCINUS Miers, 1879. 10. TYLOCARCINUS STYX (Herbst), 1803. Cancer styx, Herbst, Naturges. Krabb. u. Krebse, iii. 3, p. 53, pi. lviii. fig. 6 (1803). |