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

;CRUSTACEA. 2810. carinicauda is nearly allied to, and may prove to be identicalwith, O. Urtifrons, White, which Mr. Haswell (Cat. p. 164) mentionsas commonly occurring in sponges at Port Jackson ; but in tholatter species the spine of the lower margin of the hand (which existsin adult examples of O. carinicauda) is absent. I may add that inthe type specimen of 0. hirtifrons the bases of the second, as well asof the third, pair of legs bear a spiuule.2. Gebiopsis darwinii. (Plate XXXII. fig. A.)The carapace is vertically deep and laterally compressed (as inQehiopsis nitidus, A. M.-Edw.) ; its sides converge very slightly tothe front, which has four median spines on its anterior margin, arrangednearly in a semicircle, and are equidistant, and behind thisthe lateral margins are denticulated. The carapace is denselypubescent above in front, and its dorsal surface is bordered anteriorlyby a suture, which is continued backward nearly as far as the cervicalsuture, which is deep and well defiued. The segments of tbepostabdomen are nearly smooth, but clothed with a few hairs ; theterminal segment slightly transverse, with the posterior marginstraight and unarmed. The eyes, which have very short and thickpeduncles, are well nigh concealed beneath the front in a dorsal view.The antennules are short, the peduncles scarcely reaching beyondthe front, and each bearing two subequalflagella. The antennae arelittle longer than the carapace ; the slender peduncles reach somewhatbeyond the front ; the peniiltimate and terminal joints areshort, and clothed above with long hairs ; the llagella of the antennaeterminate in a pencil of hairs, and the several joints also beara few seta*. The chelipedes are subequal and moderately robustthe merus-joints unarmed and somewhat hairy ; the hairs longestand most abundant along the inferior margins ; the wrists are short,thinly clothed with hair, and having a few minute spinules alongtheir upper margins, of which the anterior one is the most prominent; the palms longer than broad, somewhat turgid, rovmded aboveand below, and thinly clothed with hair, which is arranged iu distantlongitudinal lines ; the fingers are hairy, much shorter than thepalms, thickened at base, dentated on their inner margins, with theirapices slightly crossed when closed, the upper much curved. Thesecond legs have the under margins of the merus-joints denselyfringed with hair, and the last three joints are also hairy ; thepenultimate joint longer than tho preceding, moderately dilated andcompressed ;dactyli shorter than the preceding joint ; the third legsare similar to the second, but the merus is less hairy below, and thepropus is shorter ; the fourth and fifth legs are much shorter andslenderer than the foregoing, and tho last three joints are more orless hairy, the hairs thickest along the inferior margins of the propus.The rami of the uropoda are broad, with the distal marginsstraight : they about reach to the distal end of the terminal segmentof the postabdomen. Colour (in spirit) yellowish white. Thelength of the largest specimen does not exceed 9 lines (19 raillim.).