360 MR. J. R. IlENDERSOX— A CONTRIBUTION 



Tlie carapace of a specimen from Madras is 23 mm. long and 29 mm. broad. 

 Distribution. Indian Ocean (Serbst, Uliite) ; Malay Archipelago {Adams Sf White). 



Genus Halimede, De Haan. 

 68. Halimede Thurstoni, n. sp. (PL XXXVI. figs. 13, 14.) 



Tuticorin, a male {Thurston). 



This species is closely allied to R. frayifer, De Haan, from Japan, l)ut is, I think, 

 distinct, though possibly it may afterwards be shown to be a variety of that species, 

 which in general form it much resembles. The carapace is covered with short tufts of 

 hair, which spring from the different elevations, and these last are raucli less marked 

 than in De Haan's species ; tliey consist simply of minute clustered granules on the 

 gastric, cardiac, and branchial regions. The short antero-lateral margin has two strongly 

 marked teeth, one at the posterior limit of the margin, the other between this and the 

 orbit ; opposite the latter tooth there is a strongly-marked flattened tul^ercle on the 

 hepatic region, and between the tooth and the orbit a third small antero-lateral tooth. 

 External to the postorbital angle is a flattened lobe, and the loAver orbital margin is 

 similarly flattened. The frontal lobes are strongly produced, with a deep intervening 

 median fissure ; each lobe is regularly convex anteriorly and the mai'gin is finely crenu- 

 lated. The inferior and internal angle of the orbit is produced, and along with a con- 

 siderable portion of the lower orbital wall can be distinctly seen fi'om above. The basal 

 antennal joint is joined to the sub frontal process, but does not extend into the inner 

 orbital hiatus as in Halimede Coppingeri, Miers (so this latter species is, as surmised by 

 Miers, probably referable to another genus). The merus of the external maxillipedes is 

 faintly emarginate at its distal end, the outer distal angle is slightly produced, and there 

 is a distinct notch for the carpus. 



The chelipedes are similar to those of De Haan's species, but the carpus and hand are 

 much less strongly tuberculate, the tubercles being almost obsolete on the outer and 

 lower surface of the hand, while those on the upper surface are regularly flattened. 

 The ambulatory legs and male abdomen resemble those of De Haan's species. 



The most important diff"erence between the two species is seeu in tlie frontal lobes, 

 which in that just described have a convex crenulated margin, while in R. fragifer they 

 are concave and entire ; in the new species also, the carapace and outer surface of the 

 hand are much less tuberculated. The MedcBus nodosus, A. Milne-Edwards, from New 

 Caledonia, bears a general resemblance to our species, but the antero-lateral margin of 

 the carapace has four teeth, the front is less ])roduced, and tlie lolies are not rounded ; it 

 is perhaps congeneric with the j^resent species. 



The carapace is 9 mm. long and 10 mm. broad. 



Genus Cycloxanthus, A. Milne-Edwards. 

 64. Ctcloxanthtjs lineatus, A. Milne-Edw. 



C. lineatus, A. Milne-Edwards, Ann. Soc. Entom. France, t. vii. p. 261) (18G7) ; id. Nouv. Arch. 

 Mus. Hist. Nat. t. ix. p. 209, pi, vi. fig. 5 (1873). 



