165 
Skeleton-fibres formed by very clear and colourless spongin- 
fibres, containing a dense mass of foreign substances; thickness of 
fibres naturally most varying; I have measured fibres from 50_ 
260 (.1, 
Spongelia sp. b. 
Coleridge Bay. Carnley Harbour. 25 f. Sandy mud. 4/XII.1914. 
Surface also here set with small conical projections, only ca. 
one mm high, separated ca. 4 mm from one another; also here 
fine lines are radiating from the apices of the papillae, some of 
these lines are continued into those radiating from the neighbour- 
ing papillae. Shape very varying; the primitive form seems to be 
oblong, lumpshaped. Shells seem to be a convenient matter of 
attachment. Greatest extension ca. 50 mm. Colour pale gray to 
grayish-yellow. Consistence soft-elastic. Dermal-membrane tough. 
Big subdermal-cavities. Oscula, ostia? 
Skeleton-fibres irregularly netformed connected. Main fibres 
are running somewhat perpendicularly towards the surface, where 
the dermal-membrane is elevated into the above mentioned papillae; 
thickness of the fibres very varying; a common thickness is ca. 
160 p. Thin spongin-fibres may be almost devoid of foreign part- 
icles, elsewhere the fibres are filled up with sandgrains, spicula- 
pieces and such things; Crossing points of bigger fibres are often 
sustained by one bigger particle, e. g. a shell of a Globigerina. 
CALCAREA. 
Homocoela. 
Genus Clathria Gray. 
Clathvia pvocumhens Ldf. 
1885. Ascetta procumbens, Lendenfeld. — A Monograph of the Austral- 
ian Sponges, part III. Proc. Lin. Soc. N. S. W.. IX, 4. 
1888. Ascetta procumbens, Lendenfeld-Catal. Spong. Austr. Mus. 
Carnley Harbour, the coast. 29/XI.1914. 
Port Ross, the coast. 26/XI.1914. 
Perseverance Harbour, Campbell I^l., under stones at low-water. 9/XII.1914. 
