96 MARINE BIOLOGY OF THE SUDANESE RED SEA. 



whicli tlie polyps are thickly clustered in catkins. A typical branch 

 separated from the common basis corresponds closely to the figure given 

 hv Klunzinger (1877). 



In more than one specimen we found no trace of spicules, but as those 

 specimens were badly preserved we suppose that some acid had been acciden- 

 tally added to the preservative. 



Localities. — Suez ; Coral shoal of Kal el Kebira in Suez Bay ; Khor Abu 

 Hamama, 10 fathoms, muddy bottom. Previously recorded from Red Sea, 

 Zanzibar, New Britain. 



LiTHOPHYTUii BRASSICUM (May). (Plate 5. fig. 4) 

 See W. May, 1899, loc. cit. p. 139, fig. 22. W. Kiikenthal, 1903, p. 120. 



We have figured (PI. 5. fig. i) a specimen which agrees in essential 

 features with Litlwphytum hrassicum, though it is somewhat divergent in its 

 mode of growth and general appearance. It is fixed to a piece of Millepore 

 and rises to a height of 20 mm., with a maximum breadth of .55 mm. It 

 shows about sixty suhglobose heads, each bearing about a score of polyps 

 which are deeply retracted. The colour is a dull light brown. 



Locality. — Edge of leeward reef, Suakim Archipelago, Telia Telia Keljira, 

 Previouslv recorded from Zanzibar. 



LiTHOPHYTUM THYR30IDES (Ehreuberg). 

 = Ammothea thyrsoides, Ehrenberg. See W. Kiikenthal, 1903, loc. cit. p. 109. 



Several fine specimens of this common species are included in the collection. 

 They consist of a conmion basis from which cylindrical stalks rise parallel to 

 one another. The polyps arise directly- from the ends of the stalks. The 

 spicules of the stalks and polyps are very slender transparent spindles with 

 few warts. 



The following measurements were taken of length and breadth in milli- 

 metres : — 



(a) Polyp-spicules : 03 x 0-01 ; 0-28 x 001 ; 02 x O'Ol ; 0-15 x O-Ql ; 



012x0 01; 0-1 X 0-1; 0-05xO-01. 



(b) Stem-spicules : 0-iG x 02 ; 0-37 x 0-02 ; 0-35 x 0-02 ; 0-27 x 0-02; 



2x0-01. 



The colour of the preserved specimens is yellowish-brown ; in life they 

 were dull brown. 



Locality. — Outer Park of Suakim Harbour. Previously recorded from 

 Ked Sea, Indian Ocean (Tumbatu), Zanzibar. 



LiTHOPHYTUM CROSSLAXDI, n. sp. 



A common stem, 2 cm. broad and 1"5 cm. high, gives origin to four limp 

 branches showing longitudinal furrows. These branches are 1 3, 12, 9, and 

 7 cm. in length respectivelv, and carry secondarv branches on which the 



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