142 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
The ovicell has frequently been described as bilobate, though apparently 
the real structure has not been appreciated, for it really is a double ovicell in 
which there are two or more larve, and in the sections cut one is a little older 
than the other. In one specimen there is an ovicell containing three larve, 
and in another ovicell there is an indication of there having been three. 
There is no complete divisional wall in the ovicell. 
On my specimens from Darnley Island, and in those described by Haswell 
from Holborn Island and Port Denison (Queensland), all of which form a 
tubular growth, no ovicells or avicularia have been seen, and without these 
organs it is impossible to feel absolutely certain of the determination. How- 
ever, the zocecia, in size and structure, are identical with those of Th. Roziert 
from other localities. 
Goldstein, Joc. cit., mentions it from Port Darwin as S. Smittii, and says 
that he has it “showing every stage from the ordinary encrusting form, 
through the frea, erect, hemescharal and escharal forms.” 
Loe. Florida (Sm.) ; Britain (/7/.); Mediterranean, in Busk collection as. 
Steganoporella bifoveolata, Heller; Manaar (7h.); Palk Bay, Galle (7h.) ; 
Pedro Shoal (7h.) ; Lifu (Ph.) ; Darnley Island (W.) ; Holborn and Port 
Denison, Queensland (Haswell) ; Mauritius (Kirkp.) ; Rio de Janeiro (B.) ;. 
Port Darwin (Gold.) ; West Australia (G'old.) ; Cape Verde Island (Cross. 
Coll.) ; Khor Dongola (19), Red Sea, collected by Crossland ; Gimsah Bay 
and Ras el Millan, collected by Hartmeyer. 
Fossil. Bairnsdale, Gippsland (W.) ; River Murray Cliffs (W.) ; Victoria 
(MacG.). 
TUBUCELLARIA CEREOIDES (Pallas). 
This has been dealt with in my paper on Tubucellaria, Journ. Linn. Soc... 
Zool. vol. xxx. (1907) p. 126, pls. 15 & 16. 
MICROPORELLA CORONATA (Audouin). (Plate 12. figs. 6-9.) 
Flustra coronata, Sav. & Aud. “ Descr. de l’Egypte,” p. 239, pl. 9. fig. 6. 
Flustra umbracula, Sav. & Aud. loc. cit. p. 239, pl. 9. tig. 7. 
Lepralia californica, Busk, Journ. Roy. Micr. Soc. vol. iv. p. 310, pl. 11. figs. 6, 7 (1856). 
Lepraha lunifera, Haswell, “Polyzoa from Queensland Coast,” Proc. Linn. Soc. New 
South Wales, vol. v. p. 40 (1881). 
Lepralia ciliata, vay., Waters, Ann. Mag. Nat. Hist. ser. 5, vol. xx. p. 188 (1887). 
The mandibles are long, directed straight forwards as figured by Savigny. 
The ovicells are not large, granular, and sometimes umbonate. There are 
usually 4 spines, though sometimes 5 or even 6, and there are large pore- 
chambers, about 16 to a zocecium. The mandibles have a projection on each. 
side directed inwards, not far from the base. 
