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Show 416 PROF. J. A. THOMSON AND MR. W. D. HENDERSON ON [Apr. 10, Family ALCYONIID^E. Alcyonium pachyclados Klunzinger. Sinularia brassica May. ,, fungoides, sp. n. Sclerophytum polydactylum (Dana). ,, querciforme Pratt. „ marenzelleri Pratt ( = Lobophytum marenzelleri ?). ,, Mr turn Pratt. ,, viricle, sp. n. Lobophytum pauciflorum Ehrenberg. ALCYONIUM PACHYCLADOS Klunzinger. This species is represented by several typical, much-lobed, almost rigid specimens of a greyish-white colour, with a greenish tint in the surrounding spirit (due to zoochlorelhe ?). The colour was originally like " cocoa-and-milk " and the expanded polyps were dark brown. A short stalk of about 10 m m . rises from a broad base, and bears several broad lobes, each divided into blunt finger-like lobules covered with polyps. The surface of the cienenchyma exposed when some of the polyps are removed is granular with numerous small elliptical spicules. The tentacles are not dark in colour, as in Klunzinger's specimens; they bear on their oral surface 30-40 short pinnules, usually in four rows, but some more fully expanded showed only two rows, one on each side. The superficial spicules are small ellipses and figure-8 forms ; the deeper spicules are for the most part relatively large, spinose, double clubs and double spheres. The following measurements were taken of length and breadth in millims. :-0*09 x 0*05 ; 0*075 x 0*045 ; 0*07 x 0*04 ; 006 x 0*02 ; 0*05 x 0*015. W e find more variety in size than Klunzinger indicates, and some of the shapes are exactly like those seen in adjacent species, such as A. brachyclados, A. cligi-tulatum, A. sphcerophorum. It seems to us that there is very little difference between the members of this group of species. Numerous ova occur in the lower parts of the polyps. Locality. Covering the shore at one place near Wasin ; also at Kiungani, Zanzibar. Previously recorded from the Red Sea, Luzon, Zanzibar. SINULARIA BRASSICA May. This species is represented by a complete specimen, which is about 50 m m . in height and 38 m m . in width across the capi-tuliim. The stalk of the colony is firm and erect, the surface granular. The capitulum is divided into three branches or lobes, each of which breaks up into a large number of small knob-like bodies. The autozooids are abundant, but are either completely withdrawn or just show the tentacles above the general surface. Numerous small spicules are found in the autozooids when they are dissected out. |