206 COLLECTIOlfS FEOM MELANESIA. 



it differs in the character of the tuberoulation 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 

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

 both of which species they may be distinguished upon the most 

 superficial examinatioin by the smoothness of the sternum and post- 

 abdomen. 



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 Actma, 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 Xaniho spinosus of Hess to' be identical with A. peronii. 



Actmodes polyaeantlius*, from the Red Sea, comes very near this 

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



Euxanihus maculatus, Haswellt (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. Hypoccelus punctatus. (Plate XIX. fig. B.) 



The carapace is transverse, somewhat broader in proportion to its 

 length than are specimens of H. seuVptus 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 punotulated. The front is rather obscurely 

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

 antero-lateral margins are strongly arcuated and cristiform, 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 B. soidptus, biit rather 

 wider than in a specimen of H. granulatmin. 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 B. sculptus in the Museum collection these pits are absent 

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



* CMorodms polyaecmthm, Heller, Sitz. Akad. Wien, xliii fi "I n 3SQ nl i; 

 fig. 21 (1861). '^'' ^' ' ^ 



t Proc. Linn. Soo. N. S. Wales, vi. p. 751 (1881) ; and ' Catalogue,' p. 48 

 (1882). 



