122 
thickest in the middle, from where they are tapering to both sides. 
Many developmental forms are found. A great many foreign spic* 
ules are incorporated in the skeleton. 
The nearest allied of known Reniera-forms is R. heterofibrosa; 
perhaps the specimen in hånd is not quite identical with that spec¬ 
ies; the great distance from the places, where the species has 
hitherto been found (North Atlantic 0('ean Auckland Islands) might 
make the identity of the species questionable, and suggest the sup¬ 
position that they are independant but converging species. But 
this argument is not strong enough for creating a new species. 
Reniera heterofibrosa Ldbck. somewhat resembles Reniera proxima 
Dendy, but the spicules are here somewhat more siender (8 // as 
against 12 p) by the same length. 
Reniera implexa Schm. 
1868. Reniera implexa, Schmidt, Spong. d. Kiiste v. Algier. 
1337 ^ Ridley and Dendy, Monaxonida. Chall. Rep. 
Vol. XX. 
Carnley Harbour. Adams Isl. The coast. 29/X1.1914. 
Masked Isl. Carnley Harbour. Under stones on the shore by low-water. 
3X11.1914. 
Port Ross. Ca. 10 f. Sand, algæ. 25/X1.1914. 
Port Ross. 9 f. Sand. 27/X1.1914. 
Of this sponge we have several specimens, most of them are 
incrusting, some lump-shaped; in these latter we are able to re- 
cognize the characteristic Renieroid type: the barrel; butin conse- 
quence of an irregular budding process the lump-shape has appeared. 
Biggest specimen measures up to ca. 50 mm, the incrusting forms 
are 3—4 mm thick; of these latter we only have fragments. In 
the erect forms the oscula are mostly found at the summit of the 
individuals, ca. 4 mm in diameter; they are openings for cloacal 
cavities of just the same width; in the incrusting forms oscula are 
lying at the top of low vulcano-shaped prominences; diameter 1- 
1,5 mm. Surface very finely hispid. Dermal-membrane very deli- 
cate, covers innumerable subdermal-cavities, which are of almost 
the same extension, ca. 0,6 mm; every cover of a subdermal-cavity 
is like a sieve, on account of several ostia opening into the cavity. 
Consistence rather fragile. Colour grayish, shading off through yellow 
and orange to reddish. 
