Report on the zoological collections made in the Indo-Pacific Ocean ...

,CRUSTACEA239cides with Dana's description and figure of a specimen from theFijis (see Explor. Exp., Cr. xiii. p. 313, pi. xix. fig. 3), For remarkson the variation of the form of the chelipedes and for synonyma, Imay refer to M, A. Milne-Edwards (Nouv. Archiv. ilus. Hist. Nat.ix. p. 281, 1873). This species apparently ranges from the coasts ofEgypt southward to Natal, and eastward to the islands of thePacific (e. g. New Caledonia, Fijis).The specimen from Port Molle diff'ers from Savigny's originalfigure of this species * in its much less distinctly granulated carapace; but specimens from Mozambique, received in the final consignmentof H.M.8. ' Alert,' have the carapace as strongly granulatedas in that figure.CAMPTOPLAX, gen. nov.Carapace trapezoidal, anteriorly deflexed, with the antero-lateralmuch shorter than the postero-lateral margins, which are straightand converge slightly to the posterior margin. Front of moderatewidth. Endostome or palate without longitudinal ridges. Postabdomen(of the male) covering at base the whole width of thesternum, and touching the bases of the fifth ambulatory legs,7-jointed. Eyes short, with thick peduncles. Antennules transverselyplicated. Basal antenual joint short, not reaching to thesubfrontal process. Outer maxillipede broad, not gaping, with themerus-joint transverse and much shorter than the ischium ; theexognath slender, straight, and reaching to the outer distal angle ofthe merus. Chelipedes of moderate length. Ambulatory legs withthe margins of the merus-joints cristated. The male verges arisingdirectly from the base of the fifth ambulatory legs, and not containedin sternal channels.This genus is apparently allied to Pilumnoplax and Heteroplax,Stimpsont, from both of which it is distinguished by the absence ofpalatal ridges and by the form of the basal antennal joint (PlateXXIV. fig. a), and also by the position of the male verges. In thelatter character it would seem to be allied to the West-Indian genusFrevillea, A. M.-Edwards;J:, which, however, diff'ers apparently inthe larger orbits and longer eye-peduncles, &c.84. Camptoplax coppingeri. (Plate XXIV. fig. A.)The carapace is subtrapezoidal. little broader than long, theanterior portion abruptly deflexed, and with three broad and shallowtransverse depressions, whereof the anterior is situated on the deflexedpostfrontal region, one in the middle line of the carapace, and onenear to the posterior margin ; the surface of the carapace is coveredwith a very close velvety overgrowth, amid which are numerous* Vide Savigny, Orustaces de I'Egjpte, pi. ii. fig. 1.t Proc. Acad. Nat. Sm. Philad. pp. 93, 94 (1858).Bull. Mus. Comp. Zool. viii.I p. 15 (1S80).