1906.] ALCYONARIANS FROM ZANZIBAR. 403 



the tentacles is broad rather tliaii 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 mm. 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 May there ai-e three 

 irregular rows. We have disregarded this difference because 

 some of the polyps on our specimen showed two rows. As before 

 indicated, this does not seem a specific charactei' of much 

 importance. 



Locality. Chuaka. 



Olavularia reptans Hickson. 



A colony spreading ovei' a monocotyledonous leaf seems 

 referable to the Claindaria reptans of Hickson. The narrow 

 stolon is from O'5-l mm. in breadth and forms a network. 



The polyps are distant, separated by an interval of 4 mm. A 

 common length is 3 mm., the breadth is 1-1 "5 mm. 



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 G. margaritiferce Thomson 

 & Henderson. 



The short tentacles are about 1 mm. in length and bear 12-15 

 pinnviles on each side, each pinnule 0'1-0"15 mm. 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 annulations and longi- 

 tudinal lines ; they are often inflated just below the tentacles or 

 just above the stolon. They vary in length from 4-12 mm. and 

 in breadth from 1-1 '2 mm. 



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 calcai'eous bodies — oval or roundish discs, 

 length by breadth 0-02 x 0-016 0-018 mm. 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 G. strumosa, but the calcareous bodies are 

 Peoc. Zool, See— 1906, Vol, I. No. XXVII. 27 



