463 
in several places, provided with rounded subgiobular outgrowths. 
Surface glabrous, though a little roughish to the touch, on account 
of the contracted State of the dermal-membrane, whereby this latter 
attains a finely granular appearance when seen under an ordinary 
pocket-lens. Oscules scattered, few, ca. 1 mm in diameter. Texture 
soft, elastic, rather tough. Colour dark brown to greyish brown. 
The skeleton resembles that of I. major, but is not so regularly 
square-meshed; in faet, secondary fibres are only very feebly de- 
veloped, in most places substituted by scattered spicules; as a 
whole the skeleton appears more diffuse than that of /. major \ in 
the few cases where meshes are formed (this being the case mostly 
under the surface) the sides of these latter are two to more spi¬ 
cules in length. The dermal-membrane is sustained by spicula-tufts 
from the main skeleton, just as in /. major. The dermal-skeleton 
also like that of /. major: a diffuse reticulation of one-layered tan- 
gentially placed tylota. 
Spicules. There is found the same spicular set as in /. major, 
except the acanthostyles, which I have not been able to find. The 
megascleres are all mueh smaller:' The smooth styli about 145 x 
8 p \ tylota ca. 150X8 thus both forms of megascleres are re- 
latively stouter than in I. major. The isocheles are 10—16 
the bipocilli, very scarce, (I have only seen a few), 6—8 f.i. 
This species is evidently closely related to I. major, and most 
probably the var. tenuis is an intermediate form, thus indicating 
the possibility, that all three forms may be one and the same 
species, which will in that case have a wide variational range. 
Micvocionia novae=zealandiae nov. spec. 
(Fig. 19 a—e.) 
Slipper Isl. The coast, by low water. 20/XII.1914. 
One enerusting specimen, growing as a 0,5 mm thick brownish 
layer on a stone; the surface is, when seen against the light, finely 
shaggy, as if covered with an exceedingly fine velvet of projecting 
spicules.. 
The skeleton can hardly be said to consist of fibres, these being 
represented by plumose brushes of big styli going from the stone 
vertically outwards and piercing the dermal-membrane. From the 
base and half way up the brushes small acanthostyles are radiating 
