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Show 1906.] ALCYONARIANS FROM ZANZIBAR. 403 the tentacles is broad rather than narrow; there are 20-30 pinnules in each row. Locality. Chuaka, Zanzibar. Previously recorded from Mozambique, Tumbatu. To the same species we refer another colony with a thin basal membrane, polyps about 12 m m . in length, tentacles 2-5 mm., and no calcareous corpuscles. In most of the polyps examined there is most distinctly only one row of pinnules, whereas in C. gracilis M a y there are three irregular rows. W e have disregarded this difference because some of the polyps on our specimen showed two rows. As before indicated, this does not seem a specific character of much importance. Locality. Chuaka. CLAVULARIA REPTANS Hickson. A colony spreading over a monocotyledonous leaf seems referable to the Clavularia reptans of Hickson. The narrow stolon is from 0*5-1 m m . in breadth and forms a network. The polyps are distant, separated by an interval of 4 m m . A common length is 3 mm., the breadth is 1-1*5 m m. As Prof. Hickson points out, this species is noteworthy in having the contracted polyps decidedly broader than the stolon which bears them. This is also true of C. margaritiferce Thomson k Henderson. The short tentacles are about 1 m m . in length and bear 12-15 pinnules on each side, each pinnule 0*1-0*15 m m . in length. There are no spicules. Locality. Zanzibar shore. Previously from Celebes. CLAVULARIA STRUMOSA Ehrenberg. The collection included numerous representatives of this species growing on twigs. They appear to be very variable. The polyps are firm and marked with aim illations and longitudinal lines; they are often inflated just below the tentacles or just above the stolon. They vary in length from 4-12 m m . and in breadth from 1-1*2 m m. The pinnules are short and blunt, arranged in three rows on each side of the middle line, leaving a considerable bare streak on the aboral surface and a fairly wide bare streak on the oral surface of the short but pointed tentacles. The number of pinnules in a row varies from 11-14, but 12 is the usual number. There are numerous calcareous bodies-oval or roundish discs, length by breadth 0*02 X 0*016-0-018 m m . By transmitted light they appear yellowish to yellowish brown in colour, but by reflected light they appear bluish to bluish green. When the edge is presented to view they appear as oval blunt rods. The colony comes near C. strumosa, but the calcareous bodies are PEOC. ZOOL. Soc -1906, V O L . I. No. X X V I I . 27 |