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

310 COLLECTIONS FROM MELANESIA.Straits which appears to merit separation at least as a variety, whichhas the segments of the body, the postabdominal process, and theuropoda covered with a dense golden-brown pubescence ; the processof the penultimate postabdominal segment very long, reaching nearlyto the extremity of the outer ramus of the uropoda, and obscurelyemarginato at its distal extremity ; the outer ramus straight, subacute,and entire, the inner represented by a short but distinctprocess of the base ; the notch in the terminal segment deep, with aprominent triangulate median process. This I wiU designateC. latreiJlei, var. longisphia. I have observed specimens of thepreceding variety which nearly resemble this in the form of theterminal notch with its median lobe. From Ciliccea tenuicaudataand C. crassa, Haswell, which this form resembles in the greatlyelongated postabdominal process, it is distinguished by wanting thetwo prominences of the terminal segment, and by the entire longerramus of the uropoda.Ciliccea antennalis *, from Swan lliver, is nearly allied toCiliccealatreillei, but may be distinguished by the nearly smooth body, theform of the thoracic segments, which are subtruncated on the sides,the much wider, shallower, transverse notch of the terminal segment,which has a very small median prominence, and the form ofthe process of the penultimate segment, which projects far beyondthe distal end of the last segment, is vertically compressed, roundedat the distal end, and marked with a longitudinal median groove ;the median froutal process, which is iiiflexed and lies betweenthe bases of the antcnnules, is truncated at its distal end, whereit is applied to the anterior margin of the labrum ; the basal jointof the antennules is considerably enlarged, more than twice aslong as broad, with a small tubercle at the distal end of its uppermargin ; the next joint, which is about half as long, terminatesin two spines below the point of articulation with the slenderthird joint : ambulatory legs very slender ; apices of the uropodasubtruncated and recurved. The type (a male) measures 10 lines(21 millim.) from the front of the head to the end of the postabdominalprocess.The genus (or subgenus) Ciliccea, I may note in conclusion, isnearly allied to Ncesa, Leach, and Campecopea, Leach ; but thetypical species of Na;sa have the last segment of the postabdomensimply notched (without a median process), and the penultimate segmentarmed with two or three dorsal processes or spines, and in thetypical species of Campecopea the terminal segment is entire. Thedistinctions between the sexes in this group are so marked that aconsiderable series is necessary and a careful examination, ordistinctions which are merely sexual may easily be taken to be indicativeof distinct species or even genera.* NcBsa antennalis, White, List Crust. Brit. Mus. p. 105 (1847) (ined.).