Report on the zoological collections made in the Indo-Pacific Ocean ...

212 COLLECTIONS FROM MELANESIA.joint longitudinally canaliciilated, and the merus truncated at itsdistal end, and with the autcro-external angle little prominent.The chelipedes are moderately robust ; merus or arm veiy short,trigonous ; carpus or wrist nearly as large as the merus, with arather prominent tooth on its inner margin, and its upper and outersurfaces marked with raised reticulating or anastomosing granulatedlines or ridges ;palm longer than the wrist, with somewhat similarsculpture on the upper surface, which has also two longitudinal depressions; on the outer surface the granulations (on the largerchelipede) are almost wholly obliterated, but in the smaller chelipede(which is the left in the two males I have examined) theycover the whole of the outer surface ; the inner surface of the palmsare smooth ; fiugers purplish brown, the coloration not extendingover any part of the inner or outer surface of the palms. Themobile finger is canaliculated above, and has a very prominent toothon its inner margin at base. Ambulatory legs of moderate length ;merus-joints nearly smooth, but with their upper margins thinedgedand almost carinated ;the two following joints are roughened,and marked on the sides with longitudinal depressions ; terminaljoints clothed with a dense velvety pubescence. The colour (of specimenspreserved in spirit) is a pale yellowish brown. Length ofthe carapace of the largest specimen (a male) about 7| lines(16 millim.), greatest width nearly 11 lines (23 millim.).A male and female are in the collection from Port MoUe, obtainedon the sandy beach (Nos. 95, 103), and a male of larger size fromPort Curtis, 7-19 fms. (No. 85). In the female the outer surfacesof both palms are vermiculated, and the fingers are pale purplish.A male is in the British-Museum collection from Facing Island,Port Curtis, obtained under stones at low water (J. IlacgilUvrm/,H.M.S. 'Rattlesnake').This species has much the aspect of a Leptodius, and is distinguishedfrom all with which I am acquainted by the armature ofthe carapace and chelipedes. It bears a very considerable resemblanceto a species from Marseilles in the Museum collection (Coll.Leach), referred by Leach, but wrongly, to Xantho jwressa of Olivi*,and designated by White (in manuscript) X. confusus, in which,however, there are no transverse granulated lines on the carapace,which is punctulated anteriorly. I have much pleasure in namingit after the late Mr. Macgillivray, by whom a specimen was collected,and by whose exertions the carcinological collections of the BritishMuseum have been so much benefited.X. hirtipes, M.-Edwards, to which is referred a specimen withoutspecial locality in the Museum collection, has some indications ofraised lines upon the carapace, but has a much less prominentstraighter front.43. Cycloxanthus lineatus, A. M.-Ediv.To this species are referred, though with some hesitation, two* 'Zoologia Adriatica,' p. 48, pi. ii. fig. 3 (1792).