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

—308 COLIECXIONS FROM MELANESIA.10. Cilicaea latreillei.Cilicsea latreillei, Leach, Did. Sci. Nat. xii. p. 342 (1818) ; Desmarest,Consid. Crust, p. 296, pi. xlviii. fig. 3 (1825).Nsesea bidentata, Gucrin, Icon. Crust. Regne Animal, Atlas, pi. xxx.fig. 2 (1829-44).Splieeroma pubescens, M.-Echvards, Hist. Nat. Crust, iii. p. 209(1840), $ PN^sea latreillei, M. -Edwards, Hist. Nat. Crust, iii. p. 218 (1840).Cymodocea piibesceus, Hasioell, Proc. Linn. Soc. N. S. Wales, v.p. 473, pi. xvii. fig. 1 (1881) ; Cat. Austr. Crust, p. 290 (1882).The following is a description of the principal distinctive charactersof this species, taken fi"om male examples bearing Leach's labelin the British-Museum collection :The segments of the body and uropoda are covered with a veryshort stiff pubescence. The head is transverse ; the eyes are borneon the rounded postero-lateral lobes, which are encased in notchesin the anterior margin of the first thoracic segment : the medianfrontal lobe is subacute and projects between the bases of theantennules. The first thoracic segment is slightly longer than thefollowing ; its antero-lateral processes are acute ; the postero-lateralrather blunt, with the posterior margins slightly hollowed out ; thesecond thoracic segment is rounded, but narrowed on the sides ; thethird and fourth subacute, the fifth less acute, and the sixth andseventh broader and rounded or subtruncated. The dorsal processof the penultimate postabdominal segment is simple, straight, itsapex scarcely acute ; it docs not project far beyond the distal endof the terminal segment, which is rather more distinctly granulatedand has on its upper surface two prominences, situated one on eachside of the dorsal process of the penultimate segment ; the notch inthe middle of the posterior margin is rather deep and as broad asdeep, and is divided by a median subtriangulate lobe. The basaljoint of the antennules is considerably dilated, longer than broad,and is slightly excavated at its distal extremity, where it is articulatedwith the next joint. The ambulatory legs are slender; andthe dactyli are armed below with a small accessory claw. The innerramus of the uropoda is represented by a blunt lobe or process of thebase ; the outer ramus is straight, not greatly longer than the base,and usually bears a small tooth on its outer margin. Length 5 lines(nearly 11 millim.).The female scarcely differs, except in wanting the posterior dorsalprocess of the penultimate postabdominal segment, and in the subequalrami of the uropoda, the inner or immobile ramus being moredeveloped, and the outer shorter in the adult, usually more acute atits distal extremity, and bearing, as in the male, a tooth on theouter margin. It presents all the appearance of a Cymoclocea.I have scarcely any doubt that the Cipnodocea (or Sphceroma)pubescens of Milne-Edwards and Haswell are the female of thisepecies. All the specimens in the considerable series before me,with the dorsal process of the postabdomen and rudimentary