120 
spicule; thickest in the middle, from here rather imperceivably 
growing more siender towards the apices, which are very finely 
acute. Length varying from 410 — 550 480 fv most common. 
Thickness rather constantly 12—13 Many developmental forms 
are found. 
Genus Reniera, Nardo. 
G/ 
Reniera cinevea Grant. 
Port Ross. Under stones at the shore by low-water. 26/XI.1914. 
Masked Isl. Carnley Harbour. The coast. 30/XI.1914. 
Several specimens. The fundamental form is the characteristic 
Renieroid: barrelshaped; but we have irregular cylindershaped to 
quite incrusting specimens. The biggest specimen of the erect form 
is 40 mm in length, 15 mm in width; of the incrusting forms, the 
edges of which nowhere are intact, the greatest dimension is 55 
mm, by a thickness of 1—3 mm. Oscula, few in the erect forms, 
numerous in the incrusting ones are 1 —1,5 mm in diameter; the 
edges are a little prominent, like a little crater. Everywhere on 
the surface are seen the numerous subdermal cavities as fine 
pricks from a needle, lying close by one another, only covered by 
the exceedingly delicate dermal membrane through which several 
ostia are leading into one cavity. 
Surface finely hispid. Consist- 
ency softly elastic in the erect 
forms, like felt in the incrusting 
ones. Colour yellowish-gray to 
brownish. 
Skeleton of irregular Renier¬ 
oid struclure. Meshes often very 
irregular; in some places it is 
even hardly possible to recogn- 
ize the mesh-shaped structure of 
the skeleton. Main fibres stouter 
and more distinet than the second- 
ary ones; main fibres often con- 
tain three spicules lying side by 
Fig. 3. Reniera cinerea, Grixni. a, oxea; side. SpOngin very SCarce. 
h, oxea with blunt apices; c, apices of nf 
spicules ; d, centrotylote oxea. From the intersectltlg pOltltS Of 
u 
