R. W. H. ROW—REPORT ON THE SPONGES: NON-CALCAREA. db61 
There is practically no cortex, but a slight thickening of the dermal 
membrane and a little mesoglea just beneath it. There is very little 
mesogloea throughout the sponge, almost the whole of the sponge being 
filled with chambers or occupied with canals. Here and there, however, one 
finds a small tract of mesogloea ; it is clear, not granular, and contains large 
numbers of small stellate cells. 
Locality. ‘‘ From beneath a floating stage in Suez Docks.” 
Distribution. Red Sea. 
DARWINELLA AUREA (?), Miller. 
Synonymy :-- 
1865, Darwinella aurea, Miller (21). 
1889. Darwinella aurea, Poléjaett (22). 
1889. Darwinella aurea, Lendenfeld (20). 
There is a single rather fragmentary specimen in the collection, which has 
been assigned to this species. It forms a thin sheet over a ‘portion of a 
mussel-shell. The preservation was not good enough for minute study or 
even to permit of certain specific identification. 
Locality. From a buoy in Suez Bay. 
Distribution. Red Sea ; Mediterranean ; coast of Spain ; 8. America. 
Family SPONGELIID4. 
Huceratosa with a (usually) reticulate skeleton of horny fibres, withont 
distinct pith, but containing foreign bodies ; or with a skeleton composed of 
foreign bodies united together by little if any spongin. With lacunar canal- 
system, and large sac-shaped flagellate chambers opening directly by wide 
mouths into wide exhalant lacune. 
SPONGELIA ADIFICANDA, Nl. Sp. 
The material on which the new species is founded is all fragmentary, though 
considerable. It consists of a large number of pieces, evidently cut off from 
a large specimen, each fragment containing a barnacle or sometimes two or 
three. There is thus considerable difficulty in describing the external form, 
and the best course seems to be to describe three or four of the fragments 
which are the largest, and to build up from those descriptions as much as 
possible of the external appearance. | 
Fragment 1.—A strap-shaped, bluntly-ending terminal portion of a branch, 
measuring 30 mm. long, 12 mm. wide, and 1:5 mm. to 2 mm. thick. It 
contains two barnacles, each forming a subspherical swelling about 6 mm. 
in diameter, near the edge of the specimen. 
Fragment 2.—A long, irregularly cylindrical process, with branches arising 
from it. It varies in diameter at different points from 8 mm. to 2 mm. 
