206 COLLECTIONS FROM MELANESIA. 



it differs in the character of the tuberculation of the carapace and 

 legs. In the smaller examples the tubercles are much smaller and 

 more acute, and these specimens have much the aspect of certain 

 Actcece, e. g. A. granulata, Audouin, and A. carcharias, White ; from 

 both of which species they may be distinguished upon the most 

 superficial examination by the smoothness of the sternum and post- 

 abdomcu. 



A small specimen from Tasmania in the British-Museum collec- 

 tion, designated " X. peronii, M.-Edw.," in, I think, Prof. A. 

 Milne-Edwards's handwriting, and two from Bass Straits, received 

 with fishes of H.M.S. 'Challenger' collection, are intermediate be- 

 tween this genus aud Actcea, and are principally distinguished by 

 the smooth, more distinctly separated and rounded tubercles of the 

 carapace and the longer spines of the ambulatory legs. I believe 

 the Xantho spinosus of Hess to be identical with A. peronii. 



Actceodes polyacanthus*, from the Bed Sea, comes very near this 

 species, but has five acute antero-lateral marginal teeth, &c. 



Euxantlms maculatus, HasweUt (which is only known to me by 

 the author's brief diagnosis), from Darnley Island, differs in the 

 form of the teeth of the antero-lateral margins and the existence of 

 longitudinal rows of pits on the outer surface of the hands. 



34. Hypocoelus punctatus. (Plate XIX. fig. B.) 



The carapace is transverse, somewhat broader in proportion to its 

 length than are specimens of II. sculptus in the Museum collection. 

 As in that species it is everywhere strongly lobulated, the lobules 

 rounded, convex, and separated by deep intervening grooves, the 

 cervical suture being even wider and deeper than the rest ; the lobules 

 are rather coarsely punctulated. The front is rather obscurely 

 bilobated (besides the rounded lobe over the inner orbital angle) ; the 

 antero-lateral margins are strongly arcuated and eristiform, with 

 scarcely any indications of any antero-lateral teeth except the last, 

 which is small and little prominent ; the postero-lateral margins are 

 shorter than the antero-lateral margins and deeply concave. The 

 inferior parts of the body are more or less coarsely pitted ; the 

 pterygostomian cavity is smaller than in II. sculptus, but rather 

 wider than in a specimen of H. granulatus in the Museum collection, 

 nearly ovate in outline, and divided along its greatest width by a 

 crest running parallel to that part of the antero-lateral margin that 

 borders the cavity above. The basal antennal joint enters the inner 

 orbital hiatus, but not so deeply as in H. sculptus. The chelipedes 

 resemble those of H. sculptus ; the wrist and palm, however, are 

 strongly pitted on their upper and outer surfaces, whereas in speci- 

 mens of H. sculptus in the Museum collection these pits are absent 

 from the wrist and from the upper surface of the palm. Fingers 



* Chlorodius polyacanthus, Heller, Sitz. Akad. Wien, xliii. (i.) p. 339 pi ii 

 fig. 21 (1861). 



+ Proc. Linn. Soc. N. S. Wales, ri. p. 751 (1881); and 'Catalogue,' p. 48 

 (1882). 



