CRirsTACEA. 239 



cidw with Dana's description and figure of a specimen from the 

 Fijis (see Explor. Exp., Cr. xiii. p. 313, pi. xix. fig. 3). For remarks 

 on the variation of the form of the chelipedes and for synonyma, I 

 may refer to M. A. Milne-Edwards (Nouv. Archiv. Mus. Hist. Nat. 

 ix. p. 281, 1873). This species apparently ranges from the coasts of 

 Egypt southward to Natal, and eastward to the islands of the 

 Pacific (e. g. New Caledonia, Fijis). 



The specimen from Port MoUe differs from Savigny's original 

 figure of this species * in its much less distinctly granulated cara- 

 pace ; hut specimens from Mozambique, received in the final con- 

 signment of H.M.S. ' Alert,' have the carapace as strongly granu- 

 lated as in that figure. 



CAMPTOPLAX, gen. nov. 



Carapace trapezoidal, anteriorly deflexed, with the antero-lateral 

 much shorter than the postero-lateral margins, which are straight 

 and converge slightly to the posterior margin. Front of moderate 

 width. Endostome or palate without longitudinal ridge?. Post- 

 abdomen (of the male) covering at base the whole width of the 

 sternum, and touching the bases of the fifth ambulatory legs, 

 7-jointed. Eyes short, with thick peduncles. Antennules trans- 

 versely plicated. Basal antenual joint short, not reaching to the 

 subfrontal process. Outer maxillipede broad, not gaping, with the 

 merus-joint transverse and much shorter than the ischium ; the 

 exognath slender, straight, and reaching to the outer distal angle of 

 the merus. Chelipedes of moderate length. Ambulatory legs with 

 the margins of the merus-joints cristated. The male verges arising 

 directly from the base of the fifth ambulatory legs, and not contained 

 in sternal channels. 



This genus is apparently allied to Pilwmnoplax and Heteroplax, 

 Stimpsont, from both of which it is distinguished by the absence of 

 palatal ridges and by the form of the basal antennal joint (Plate 

 XXIV. fig. a), and also by the position of the male verges. In the 

 latter character it would seem to be allied to the West-Indian genus 

 Previllea, A. M.-EdwardsJ, which, however, differs apparently in 

 the larger orbits and longer eye-peduncles, &c. 



84. Camptoplax coppingeri. (Piatb XXIV. fig. A.) 



The carapace is subtrapezoidal, little broader than long,, the 

 anterior portion abruptly deflexed, and with three broad and shallow 

 transverse depressions, whereof the anterior is situated on the deflexed 

 postfrontal region, one in the middle line of the carapace; and one 

 near to the posterior margin ; the surface of the carapace is covered 

 with a very close velvety overgrowth, amid which are numerous 



* Vide Savigny, Orustac^s de I'Egypte, pi. ii. fig. 1. 

 t Proc. Acad. Nat. Soi. Philad. pp. 93, 94 (1858). 

 { Bull. Mus. Comp. Zool. yiii.p. 15 (1880). 



