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

CRUSTACEA. 275curved at, tips, and having betvreen them a small hiatus whenclosed ; the upper or mobile finger is strongly arcuated, sometimeswith a strong blunt tooth at base ; the lower has its inner marginobscurely crenulated and sometimes toothed. The first three pairsof ambulatory legs are robust, the joints nearly naked and withoutdenticles or spinules, except on the inferior margins of the penultimatejoints, which have two or three spinules at or near the distalextremity ; the dactyli are short, robust, and appear biunguiculateon account of the considerable development of the accessory spine onthe inferior margin, behind which is another small denticle. Theground-colour (in spirit) is yellowish ; the carapace and chelipedesare blotched with pink or marked with irregular lines of the samecolour. Length of carapace of an adult male about 4 lines (8^millim.), breadth about ;3| lines (8 millim.) ; length of chelipede~,when fully extended, about 8| lines (20 millim.).Port Denison, 4 fms. (No. 122) : a considerable number of specimenswere obtained. Specimens were also received with thesecond collection from Friday Island, 10 fms. (No. 153), DundasStraits, 17 fms. (No. 161), Port Darwin, 12 fms., and others dredgedin the Arafura Sea at 82-36 fms. (No. 160).The description, except as regards coloration, is taken from anadult male ; the coloration is ])erfectly preserved in one specimenonly, a female with ova. The larger specimens possessing bothchelipedes are mostly of the female sex. In the females andsmaller-sized specimens the lateral lobes of the front arc often moreacute, the palms of the chelipedes relatively shorter, the fingersmeet along their inner edges when closed, and the upper finger hasnot the strong tooth at base, etc.In the robust and biunguiculate dactyli of the ambulatory legsthis form resembles the species of Folyonyx, but differs in the relativelylonger carapace, which resembles that of other species ofPorcellana.I refer it doubtfully to F. nitida *, which is very briefly described,and diff"ers apparently in the triangulate form of themedian frontal lobe, and in having an additional lateral marginalspine behind the outer angle of the orbit ; but as Haswell's typeswere from Port Denison, at which locality specimens of the formnow described were taken by Dr. Coppinger, I distinguish it merelyas a variety.10. Porcellana dispar, Stimpson. (Plate XXX. fig. C.)Four males and two females from Port Jackson, 5-7 fms. (No.104), are referred to this species, which Mr. Haswell (Cat. p. 149)observes is very common at this locality. He also records it fromPort Stc])heus.kStimpson's description agrees very well with the ad\ilt males, but* Vide Hiiswell, Catalogue, p. 148 (1882).t2