R. W. H. ROW—REPORT ON THE SPONGES : NON-CALCAREA. 365 
in which the fibres run tangentially. The cortex measures 0°06 mm. to 
0-07 mm. in thickness. 
Locality. Suakin Harbour. 
Distribution. Red Sea, 
DysIDEA CINEREA, Keller. 
Synonymy :— 
1889. Dysidea cinerea, Keller (18). 
There occurs in the collection a single specimen. which I identify with this 
species. It agrees with Keller’s original description in general shape and 
appearance very closely, but in certain features it differs. Keller’s original 
description of the external appearance runs as follows:—“ Der Schwamm bildet 
massige Stiicke oder Krusten von 5-10 cm. im Durchmesser, auf welchen sich 
zweilen einzelne kurze abgerundete Fortzatze erheben, deren Durchmesser 
etwa 1 em. betriigt, und deren Hohe zwischen 3-3 cm. schwankt.”’ 
The specimen now being considered forms a mass 60 mm. high and 
120 mm. long by 45 mm. wide. The upper surface of the sponge is covered 
with short processes 10 mm. to 30 mm. high, by about 15 mm. in diameter. 
Several processes also occur on the sides of the specimen. So far the specimen 
is almost identical with Keller’s, but the basal part of the sponge in my 
specimen is apparently formed entirely of the partly fused lower portions of 
the processes referred to above. There is no true undivided portion of the 
sponge, and the composite character of the whole is rendered evident by the 
fact that the spaces between the various processes are continued down into 
the base of the sponge, and the conuli that cover the outside surface of the 
sponge can also be seen at the sides of these cavities. It may be assumed 
therefore that the sponge consists of a mass of tubes, with their basal portions 
partially fused, and 10 mm. to 30 mm. free at the distal end. 
The colour in spirit is pale brown. 
The skeleton and the canal-system are identical with Keller’s original 
description. 
Locality. No locality is given, but the sponge was obtained at a depth of 
9 fathoms. 
Distribution. Red Sea. 
PSAMMOPEMMA COMMUNE (Carter). 
Synonymy :— 
1885. Hircinia communis, Carter (6). 
1889. Psammopemma commune, Lendenfeld (20). 
The present species was represented in the collection by four specimens, 
all of the same habit. Hach consists of a mass of upright cylindrical 
processes, which branch and anastomose to form an irregularly but densely 
