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

CKUSTACEA. 233smooth. Front 8-lobed, the lobes rounded, the median scarcelymore prominent than the rest ; the fissure between the median lobesand between the second and third lobes narrow-linear, tliose betweenthe first and second and the third and fourth lobes triangulate.Antero-lateral margins armed with six teeth, whereof the first issubtruncated, the second to filth triangulate and acute and directedforward, the sixth about twice as long as the preceding and laterallyprojecting.Chelipedes short and robust, arm or merus-joiut withtwo strong spines near the distal end of its anterior margin, its posteriormargin convex, smooth, and angulated at a point midway fromeither extremity ; wrist with a strong spine on its inner margin, andthree smaller spines on its outer surface ;palm with three spines,whereof one is situated at the proximal end close to the articulationwith the wrist, and two on the upper surface; there is none abovethe base of the mobile finger ;the carinae of the upper and outer surfaceof the palm and the intervening parts are nearly smooth ; thefingers are armed along their inner margins with triangulate teeth,which fit closely between one another when the fingers are closed,and which are themselves divided into several smaller teeth. Thesecond to fourth ambulatory legs are slender, smooth ; the penultimatejoint of the fifth leg is not denticulated on its inferior margin ;there is a spine at the distal end of the inferior margin of themerus-joint. Length of the carapace of the largest example aboutIinch (19 millim.), breadth to base of lateral epibranchial spinesabout 1 inch (25 millim.).A single specimen is in the second collection, a male from PortDarwin, 12 fms.There are in the British-Museum collection several specimens ofwhat is probably a mere variety of this species from Karachi(Karachi Museum)^ referred to by A. M.-Edwards as G. calUanassa,which differ in having wider fissures between the median and thesecond and third teeth of the front. The first tooth of the anterolateralmargins is more distinctly truncated, and the last spine isshorter ; also the spines of the arm, wrist, and palm of the chelipedesare much shorter, those of the upper surface of the palm beingreduced to mere spinules, and the palm itself much more turgid, asin A. Milne-Edwards's description.74. Goniosoma spiniferum. (Plate XXIII. fig. C.)A single specimen is in the collection, obtained at Port Molle,between tide-marks (Xo. 103), which is evidently nearly allied to,and in M. A. Milne-Edwards's arrangement must be classed near to,Goniosoma affine (Dana), from Singapore. It differs, however, inthe form of the frontal lobes, the median and submedian beingbroadly rounded and separated by narrow and not deep fissures.The fissure between the second and third lobe on each side is muchdeeper, and, although narrow, wider than those between the medianand submedian lobes ; the third lobe is itself narrower than these,