477 
nected by short whisps of spicules. When the fibres reach the sur- 
face, they split up into short tufts of spicules; such tufts are also 
formed by isolated spicules under the dermal-membrane, where no 
fibres reach this latter. 
Spicules. S ty li (fig. 29 a) or sub tyl osty li (fig. 29 b), nearly 
straight or somewhat bent, tapering to the sharp points; about 300 fv 
long by a thickness of 7—8 p. 
Hymeniacidon haurakii nov. spec. 
(Fig. 30.) 
North Channel. Kawaii Isl. Hauraki Gulf. 10 fathoms. Hard 
bottom. 29/XII.1914. 
Enerusting. Several shells are cemented together by the sponge, 
so that the whole aggregation forms a lump-shaped body of ca. 45 
mm in greatest extension; the surface is beset with small cones, up 
to 1 mm in hight, 1—3 mm apart. Spicules are piercing the dermal- 
membrane, especially at the top of the conuli; texture tough, elastic; 
colour light grey. Several small ostia, which can just be seen with 
a pocket lens, are leading into spacious subdermal-cavities; oscula 
rather numerous, 1—2 mm in diameter, not elevated over the level 
of the sponge-surface. 
The skeleton consists mainly of scattered spicules, lying with- 
out order; but rather distinet fibres are met with, in a few places 
of tolerable Axinelloid structure. No special dermal skeleton is 
found; here and there, however, the fibres, which are all directed 
more or less perpendicularly towards the surface, are bending in a 
right angle when reaching the dermal-membrane, and passing tan- 
gentially along this in ca. one spicule’s length. 
Spicules. S ty li (fig. 30), more or less irregularly curved, of 
even thickness for the greater part, then tapering towards the very 
Sharp point; length varying from about 400—800 /t, by a thick¬ 
ness of up to 14 
Hymeniacidon novae^zealandiae nov. spec. 
(Fig. 31 a-d). 
Little Barrier Island. 30 fathoms. Shell-bottom. 29/XII.1914. 
One specimen. A long siender stalky body, near the apex di- 
viding into two branches; length ca. 160 mm, thickness 2 mm in 
