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Show 1906.] ALCYONARIANS FROM ZANZIBAR. 431 WRIGHTELLA VARIABILIS, sp. n. (Plate XXVIII. figs. 3-9.) The collection included a considerable number of small delicate Melitodida?, of beautiful and apparently variable coloration. The branches tend to be compressed ; they lie for the most part in one plane ; the verruca? are for the most part lateral; the spicules are warty spindles, straight and curved, sometimes kneed, and clubs with warty expanded ends which are not foliate enough to be called " Blattkeulen." At the same time, the specimens seem nearer the genus Wrightella than any other, and till a large number of specimens is available it seems convenient to combine the various specimens in this collection under the common title W. variabilis. They differ not only in colour, but in respect to the proportions and warts of their spindles and clubs. Some of the colour-schemes of these closely-related forms are shown in Plate XXVIII. W e may readily distinguish: (a) a form with a variable combination of red and colourless spicules, with more substantial and shorter branches than the others and a closer approach to W. erythrcea ; (b) a form with yellow internodes and the usual brown nodes appearing as red; (c) a salmon-coloured form ; (cl) a crimson form with yellow verruca?; and (e) a reddish-brown form with red verruca"*. Locality. Wasin, among coral, low tide. Order IV. AXIFERA G. von Koch. Family G O R G O N I D ^ E . Leptogorgia ochracea, sp. n. Lophogorgia crista Mobius. ,, lutkeni Wright k Studer. Family GORGONIDJE. LEPTOGORGIA OCHRACEA, sp. n. (Plate X X I X . fig. 1.) This apparently new species of Leptogorgia is represented by a beautiful dry specimen, 18*5 centims. in height by 15 in maximum breadth. It has a bright ochreous-yellow colour and expands for the most part in one plane with several anastomoses. The disc of attachment has been separated from the substratum and has been overgrown almost entirely by the coenenchyma and a Polyzoon. From the basal expansion, about 22 m m . in diameter and 9 mm. in height, there rises a main stem, 4 m m . in basal diameter, which gives off numerous branches. Just at the base a large branch is given off, so nearly equal to the main stem in diameter (3 mm.) that it might be regarded as of equal importance. The main stem is at first circular, but soon becomes flattened in the plane of expansion ; the larger branches are also flattened, but the twigs are cylindrical. There is no particular arrangement of brandies, but the tendency to arise on one side, i. e. towards vacant space, is well-marked. The tips of the |