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

;CRUSTACEA. 313Leucothoe ? crassimana, Kossinann, Zool. Ergehn. einer Reise rothenMeeres, Malacostraca, p. 131, pi. xiii. figs. 9, 10 (1880).Leucothoe commensalis, Hasioell, Proc. Linn. Soc. N. S. Wales, iv.p. 201, pi. X. tig. 3 (1880) ; Cat. Austr. Crust, p. 248 (1882), var.I refer to this species a single specimen from Port Jackson, 0-5fms. It differs oiily in the greater length of the superior antennaefrom Mr. Haswell's description of L. commensalis, these exceedingin length the head and first four segments of the body. It rangesalong the whole eastern coast of Australia, from Thursday Island inthe north to Western Port in the south.Mr.Haswell describes this as being one of the commonest Amphipodaof Port Jackson, where it is found within the pharynx of acommon large tunicate, in the cavities of large sponges, and in othersimilar situations. A mutilated specimen is in the Museum collectionfrom this localit}', received from J. Brazier, Esq.It is not without much hesitation that I unite L. commensaliswith the European L. articulosa, yet upon comparison of theAustralian specimens of L. covunensalls with the specimens fromGreat Britain and Norway in the British-Museum collection I candetect no difference of specific importance. In one English specimenthe eyes are reddish, in another Australian example reddishblack, and in others scarcely any trace of the pigment remains.There are variations in the length of the antennae and in the formof the antero-lateral processes of the first segment of the body, andalso in the degree of acuteness of the apex of the carpal process ofthe second pair of legs, which, however, I cannot connect with thegeographical habitat of the individuals examined. As, however, theseries the Museum possesses is but small, and there are in thenational collection no specimens from localities intermediate betweenGreat Britain and Australia, it may be well to consider Mr. Haswell'sspecies as a variety, sincethere may be distinctive charactersdiscoverable in the colour of the eyes, or in other minor particulars.The eyes in Abildgaard's original description are described asblack.Kossmann's species {L. crassimana), from the Red Sea, is onlybriefly characterized, but the details figured would seem to showthat this species is also identical with or very nearly allied toL. articulosa.3. Leucothoe brevidigitata. (Plate XXXIV. fig. A.)The body is smooth, dorsally rounded and laterally compressedthe coxae of the first four legs deep, as in allied forms. Head small,with a very small median rostral lobe, its antero-lateral anglesrounded and not much produced. The coxae of the fourth legs arebut little longer than the preceding, without any distinct posterolaterallobe ; they are slightly overlapped by the much shorter coxaeof the fifth legs. There is a very small acute tooth at the posterolateralangles of the first tail-segment ; these angles in the second