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Show 1906.] ALCYONARIANS FROM ZANZIBAR. 429 spicules in the triangular sheaf. The triangles rise from a transverse ring of about three rows of spindles. The cortical spicules are slender spindles with a few rough warts. A common size was 0*8 mm. in length by 0*06 m m. in breadth. The inner spicules of the stem are strong spindles closely covered with rough waits. They vary greatly in size and in the number of warts ; some bear fine spines, and some are bifid or slightly branched at one end. A common size is 2*6 m m . by 0*175 mm. Probably the specimen is a young form, and we found no trace of ova. It seems to us undoubtedly a Siphonogorgid, perhaps intermediate between Siphonogorgia and Chironephthya; but it is quite unlike any form known to us. With much hesitation we have, for convenience of reference, named it Siphonogorgia intermedia. Loccdity. Zanzibar shore. Order III. PSEUDAXONIA G. von Koch. Family SCLEROGORGIDYE. Suberogorgia kollikeri Wright k Studer, var. zanzibarensis, n. Family MELITODIDYE Wrightella erythrcea Gr&y = Mopsea erythrcea Klunzinger. ,, variabilis, sp. n. Family SCLEROGORGIDYE. SUBEROGORGIA KOLLIKERIWright k Studer, var. ZANZIBARENSIS, n. (Plate XXIX. fig. 4.) (A.)-A small fragment consisting of a part of a stem or branch from which two lateral branches are given off* on the same side. The stem or branch and the lateral branches are all compressed in the plane of branching. The branches come off at an angle which approaches 90°, and then turn upwards and run roughly parallel to the main stem or branch. On both surfaces of the main and lateral branches there is an irregular groove which in some parts almost disappears, being marked only by a narrow strip of colourless spicules. The verruca? are arranged in a single row on each of the lateral surfaces ; they are disposed alternately, though at some places they are almost opposite ; they are small, and appear as low rounded swellings on the sides. The polyps are completely retractile, and are white in colour. In the tentacles, which are short, there are small rod- or spindle-shaped spinose spicules which are from 0*08-0*12 m m . in length and have an average diameter of 0*02 m m. The spicules of the body of the polyp are flattened sword-shaped bodies with rough warts or teeth on the edges, and may be either straight or slightly curved. |