Species of Maioid Crustacea. 11 



are two spines on each branchial region. Over the eye is a 

 very prominent and triangular spine ; the postocular is smaller 

 and blunt, the rostral spines are acute and divergent, the 

 basal antennal joint is very large, with a spine, directed for- 

 ward, at its antero-external angle. Outer maxillipedes smooth ; 

 ischium joint very narrow ; merus joint large, concealing the 

 following joints, without a notch at its antero-internal angle, 

 and much produced and rounded at its antero-external angle ; 

 exognath very large, broader than the ischium joint. Ante- 

 rior legs (in the male) smooth ; palm compressed and carinated 

 above, ringers nearly as in Paramithrax spinosus. Ambula- 

 tory legs slender and smooth, terminal joints slightly curved. 

 Postabdominal segments (in the male) smooth, distinct. 

 Length of carapace to base of rostrum nearly £ inch. 



Bab. Fiji Islands, Ovalau (H.M.S. l Herald'). 



I propose to restrict the genus Acantlwphrys to the species 

 having the outer maxillipedes of the form described above. I 

 have not seen the type specimens of either of M. A. Milne- 

 Edwards's species ; but this character (if we may judge from 

 the figure) seems to exist in his Acantliophrys cristimanus j 

 and it certainly does in a specimen which I refer to it from 

 the Marquesas in the British-Museum collection, and which 

 is labelled " Pisa cristimana" There seems to be no other 

 positive character to distinguish this genus from Paramithrax. 

 One male individual of A. paucispina is in the collection. 



Pisa carinimana, sp. n. (PI. IV. fig. 6.) 



The carapace of this pretty little species is subpyriform, 

 closely pubescent, and with a few longer curled hairs. There 

 are six very obscure tubercles or granules disposed in two 

 transverse series of three each upon the gastric region, and 

 two tubercles on the branchial regions, besides the small 

 lateral epibranchial spine • the cardiac region is very convex, 

 elevated, and rounded ; and there is a small median tubercle 

 upon the posterior margin of the carapace. The upper orbital 

 margin projects considerably ; and the hiatus in it encloses a 

 small tooth. Behind the postocular tooth or lobe is another 

 small tooth. There is a row of granules on the pterygosto- 

 mian regions. The spines of the rostrum are rather long, 

 slender, and divergent from a point at some distance above 

 their base. The anterior legs in the male are rather small ; 

 arm granulated on its upper, outer, and lower margins ; wrist 

 obscurely carinated on its outer surface; palm compressed, 

 carinated above and below, and longitudinally faintly sulcated 

 on its outer surface. The second pair of legs are much longer 

 than the succeeding. Fingers denticulated on their inner 



