212 COLLECTIONS FROM MELANESIA. 



joint longitudinally canaliculated, and the morus truncated at its 

 distal end, and with the antero-external angle little prominent. 

 The chelipedes are moderately robust ; merus or arm very short, 

 trigonous ; carpus or wrist nearly as large as the merus, with a 

 rather prominent tooth on its inner margin, and its upper and outer 

 surfaces marked with raised reticulating or anastomosing granulated 

 lines or ridges ; palm longer than the wrist, with somewhat similar 

 sculpture on the upper surface, which has also two longitudinal de- 

 pressions ; on the outer surface the granulations (on the larger 

 chelipede) are almost wholly obliterated, but in the smaller cheli- 

 pede (which is the left in the two males I have examined) they 

 cover the whole of the outer surface ; the inner surface of the palms 

 are smooth ; fiugers purplish brown, the coloration not extending 

 over any part of the inner or outer surface of the palms. The 

 mobile finger is canaliculated above, aud has a very prominent tooth 

 on its inner margin at base. Ambulatory legs of moderate length ; 

 merus-joints nearly smooth, but with their upper margins thin- 

 edged and almost carinated ; the two following joints are roughened, 

 and marked on the sides with longitudinal depressions ; terminal 

 joints clothed with a dense velvety pubescence. The colour (of spe- 

 cimens preserved in spirit) is a pale yellowish brown. Length of 

 the carapace of the largest specimen (a male) about 7| Hues 

 (16 millim.), greatest width nearly 11 lines (23 millim.). 



A male and female are in the collection from Port Molle, obtained 

 on the sandy beach (Kos. 95, 103), and a male of larger size from 

 Port Curtis, 7-19 fms. (No. 85). In the female the outer surfaces 

 of both palms are vermiculated, and the fingers are pale purplish. 



A male is in the British-Museum collection from Pacing Island, 

 Port Curtis, obtained under stones at low water (J. Macgillivray, 

 H.M.S. 'Rattlesnake'). 



This species has much the aspect of a Leptodius, and is distin- 

 guished from all with which I am acquainted by the armature of 

 the carapace and chelipedes. It bears a very considerable resem- 

 blance to a species from Marseilles in the Museum collection (Coll. 

 Leach), referred by Leach, but wrongly, to Xantho poressa 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 naming 

 it after the late Mr. Macgillivray, by whom a specimen was collected, 

 and by whose exertions the carcinological collections of the British 

 Museum have been so much benefited. 



X. hirtipes, M.-Edwards, to which is referred a specimen without 

 special locality in the Museum collection, has some indications of 

 raised lines upon the carapace, but has a much less prominent 

 straighter front. 



43. Cycloxanthus lineatus, A. M.-Edw. 

 To this species are referred, though with some hesitation, twe 

 * 'Zoologia Adriatica,' p. 48, pi. ii. fig. 3 (1792). 



