124 
The specimen in hånd I refer to Reniera implexa Schmidt, al- 
though the oxea here are decidedly bigger than in Schmidt’s ori¬ 
ginal specimen, and the primary fibres in this latter are unispic- 
ular, while here there are 1—3 spicules side by side. My spec- 
imens do, however, agree tolerably well with the description of 
R. impl. var., as given by Ridley and Den dy, although the oxea 
there only measure 6,3 p in thickness (here 7 , 5 ; Schmidt has 7,o), 
perhaps Ridley and Dendy (and I too accordingly) have given 
too wide an expansion to the boundary of the variation of the 
species R. implexa; but until a monographic dealing with the genus 
Reniera has cleared up the relation of the more or less well founded 
species, surely it is the safest not to break up the old species 
where it is not nescessarily required. 
Reniera laxa Ldbck. 
1902. Reniera laxa, Lundbeck. — Porifera in ‘The Danish Ingolf Exp. 
Vol. VI, Part 1. 
Perseverance Harbour. Campbell Isl. 20 f. Sandy mud. 10/XII.1914. 
Port Ross. Ca. 10 f. Sand, Algae. 25/XI.1914. 
Only fragments at hånd. Almost barrelshaped. Greatest length 
135 mm, thickness about 7 — 8 mm. Surface finely hispid. Dermal- 
membrane very delicate, covers numerous small dermal cavities. 
Osculum at the end of a barrel, only a few at the sides, ca. 1,5 
mm in diameter. Ostia could not be seen. Cloac-cavities perfor- 
ate the body as perfectly cylindrical tubes, diameter the same as that 
of the osculum. Consistence rather elastic, soft. Colour very light, 
yellowish-gray. 
Skeleton very dense on account of the innumerable, irregularly 
scattered spicules; structure just the same as that of the Reniera: 
primary fibres radiate perpendicularly towards the surface, con- 
nected by loosely lying spicules in every direction; distance be- 
tween the fibres the same as the length of one spicule; number 
of the spicules in the fibre side by side 2—6. 
Spicules: (fig. 6) oxea, slightly bent in the middle, from here 
the spicule is tapering a little towards both ends; the real sharpen 
ing to the fine point, however, takes place only at the extreme 
Va. Dimensions rather constant: length about 182 p, thickness 
10,5 p. Many developmental forms. 
