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outwards. The length varies from 10 to 15 mm. These
spicules are the most numerous, and together with the large
obtuse ones they form the greater part of the inner skeleton.
The spinulate spicules (Plate 23, tig. 2) are not numerous,
The one termination is sharp-pointed, the other rounded to a
head, which is microspined as are the terminations of the obtuse
spicules. The length of the spinulate spicules is about 5 mm.
These spicules are, as already stated, rare in this species, and
therefore I believe that they are only deformities of other
typi-cal spicules, probably of the large acerate ones.
The small spined acerate spicules (Plate 23, fig. 5). These
spicules are very numerous, but still I believe that they are
varieties of the following kind. Their spination and central
inflations made me come to that conclusion. They are spined
all o ver, and furnished with four bulbous inflations at the
centre; these inflations correspond to the four shorter rays of
the following kind of spicules. The length is tolerably
constant, not exceeding 0,25 mm.
The smaller hexracliate spicules (Plate 23, fig. 8, 9, 11) are of
three separate kinds. In the largest the rays have a length
of about 0,i mm, two of the rays being a little longer than
the other. The second kind of hexradiate spicules agree very
much with tlie first mentioned. The difference only consists
in the size. The rays of these smaller spicules are 0,os mm.
As the above-mentioned they are also spined. The third kind
of smaller hexradiate spicules differs more from the two others.
The rays are more slender and smooth, the points being curved.
The length of each ray is about 0,03 mm. All these hexradiate
spicules are very numerous in the inner, softer parts of the
sponge.
The very lar ge hex(quinque)radiate spicules (Plate 23, fig. 6—7).
These spicules have properly only five rays, the sixth being
more or less undeveloped. One of these five rays is much
longer than the others. The proportion between this ray and
the other four is 3 : 1. This longer ray is slightly curved and
smooth. The others are straight and microspined at the
termi-nations, which are either obtuse or sharply pointed. The whole
ray is rarely microspined but furnished with rare, large, sharply
pointed spines (fig. 7). These spicules are not numerous.
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