326 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
Locality. Two specimens were obtained from the mud-flats at Suez, and the 
third from Suez Docks. 
Mstribution. Red Sea, Kurrachee, Ceylon, Port Jackson. 
SIPHONOCHALINA TUBULOSA, Ridley. 
Synonymy :— 
1884. Stphonochalina tubulosa, Ridley (23). 
1887. Phylosiphonia pumila, Lendenfeld (19). 
1889. Phylosiphonia pumila, Keller (18). 
This species is represented bya considerable number of specimens, all of which 
are small. The largest possesses five tubes arising from a flat spreading base. 
The whole specimen measures 70 mm. by 60 mm. ; the tubes are 25 mm. high 
and 12 mm. to 15 mm. in diameter. At the top of each tube is a large 
osculum 6 mm. to 7 mm. across. 
The colour in spirit is yellowish white. 
All the specimens are very similar in external appearance, and their tubular 
processes are almost identical, but the skeleton of two of the specimens differs 
considerably from that of the others in the size of the spicules, which measure 
as follows :— 
Specimens A to G. Specimens H & Ks. 
LLGOGAD 5550.52 0-08 mm.—0°12 mm. 0:06 mm.-0°08 mm. 
Diameter ... 0-008 mm. 0-008 mm. 
Locality. One specimen was obtained from a buoy in Suez Bay, all the 
others (8) coming from Mersah Makdah. 
Distribution. Red Sea. 
SPINOSELLA SORORIA (Duchassaing § Michelott’). 
Synonymy :— 
1864. Tuba sororia, Duchassaing et Michelotti (13). 
1870. Stphonochalina papyracea, O. Schmidt (25). 
1890. Stphonochalina sororia, Dendy (8). 
A single incomplete specimen, consisting of one tubular process, apparently 
broken off from the centre of a large specimen, has been placed in this species. 
The lower surface of the specimen has evidently been attached to some object, 
but of this support there is no part on the sponge. The sponge is 55 mm. 
in height, and 30 mm. wide at the top, which is the widest portion, and the 
aperture or ‘‘ pseudosculum ” which occurs at the top of the tube is 10 mm. 
in diameter. 
The surface of the sponge is raised into prominent conuli, which average 
5mm. in height. At these points the main fibres of the skeleton come to the 
surface. 
These main fibres are arranged fairly regularly, and lie radially in the 
