PROF. THOMSON AND MR. McQUEEN REPORT ON THE ALCYONARIANS, 89 



Order I. STOLONIFERA, Hickson. 

 Clavularia pulchra, Thomson and Henderson (1906). 



See J. Arthur Thomson and W. D. Henderson : " Alcyonaria of Zanzibar and British 

 East Africa from Collections made by Cyril Crossland," Proc. Zool. Soc. 1906, p. 405. 



A large colony growing on a pearl-oyster shell and on the stone to which 

 the shell is attached. 



The polyps, which arise from a strong basal membrane, are large and 

 substantial ; the body varies from 10 to 30 mm. in length, and from 2 to 

 3'5 mm. in breadth ; the tentacles are 5 to 10 mm. in length. There is a very 

 marked hypostome, about 1 mm. high. There are 28 pinnules on each side 

 of a tentacle, and they are for the most part very long and slender. In some 

 cases, however, they are almost wart-like. This diversity depends in this 

 case on the degree of contraction. 



The whole surface of the colony glistens with calcareous rods ; the fol- 

 lowing measurements were taken of their length and breadth in milli- 

 metres :— 0-054 X 0-018 ; 009 x 0-02. 



Locality. — Khor Dongola, 10 fathoms ; previously recorded from Zanzibar 

 shore, 



Sympodicm fulvum (ForsMl). 



= Lithophyton fiihum, ForskSl (1775). 

 Sympodium fuh-um, Ehreuberg (1884). 

 See W. May : " Beitrage zur Systematik und Chorologie der Alcyonaceen," Jenaische 



Zeitschr. Naturwiss. xxxiii. (1899) p. 52. 

 W. Kiikenthal : " Ueber einige Korallenthiere des roten Meeres," Festschrift von 



E. Haeckel, 1904, p. 41. 



A large number of specimens seem to be referable to this species, the only 

 noteworthy difference from the type being that the general spicules of the 

 coenenchyma are not visible to the naked eye. A characteristic feature is the 

 armature of the polyp-body, which consists of eight double rows of spicules 

 arranged in chevron, and with some horizontally disposed spicules at the 

 bases of the rows. According to Kukenthal. this type should be referred to 

 Alcyo^imm. 



Locality. — Very abundant about Matala Island in Khor Dongola, one of 

 the richest pearling shallows. Previously recorded from the Red Sea and 

 East Africa (Tumbatu). 



TuBiPORA purpurea, Pallas. 



The differences between alleged different species of Tuhipora remain in a 

 very unsatisfactory stage of definition. Emphasis has been laid, for instance, 

 oil the number of pinnule-rows. But our speeimen shows with equal clearness 

 polypes whose tentacles have a single row on each side, and polyps whose 

 tentacles have a double row on each side. The difference is in this case due 



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