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The obtuse spicules (Plate 23, fig. 3—4). These spicules
are-slightly curved, sometimes infiated at the centre, and all are
microspined at the obtuse terminations. Very numerous.
The large acerate spicules (Plate 23, fig. 1) are a little greater
than those of Hyalonema rosea. They are also very numerous.
The spinulate spicules. The spicules of this kind have a
greater head than those of the preceding species, but in
other respects they agree well with those of H. rosea. They
are not numerous, tbough not as rare as in H. rosea. The
length of all these three kinds of spicules is about the same
as in H. rosea.
The large hex(quinque)radiate spicules (Plate 23, fig. 12).
These spicules are very few in number and very often quite
smootli, exceedingly rarely microspined at the sharply pointed
ends. The rays are slightly curved, one being much longer
than the otliers, but of the same diameter. The length of the
largest ray is 2,8 mm. The shortest ray is about 1,4 mrn in
length.
The larger microspined hexradiate spicules (Plate 23, fig. 13)
differ from the smaller spicules of the same kind by their
rays, which are all well developed in the greater kind. Pive
of the rays are 0,2 nnn in length, the sixth being about 0,4 mm.
Ali the rays are microspined, straight, and more or less
obtusely pointed.
The smaller microspined hexradiate spicules (Plate 23, fig. 14).
In these spicules only five rays are well developed; the sixth is
very minute and obtuse, while the others are obtusely pointed
as in the larger hexradiate microspined spicules. Ali the rays
are straight and microspined, the length of the well-developed
ones being 0,i mm, of the minute ray only 0,02 mm; this ray
is of the same diameter as the others.
The rosettes with sharply pointed branches (Plate 23, fig. 17)
re-semble a little the rosettes of H. rosea, figured Plate 23, fig. 10.
Here we have also a thick central cross, every branche
termi-nating in two slender, smooth, slightly curved and sharp-pointed
arms. The size from the centre of the cross to the point of an
arm is about 0,os mm.
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