412 FRISTEDT, SPONGES. 
outwards. The length varies from 10 to 15 mm. These spi- 
cules are the most numerous, and together with the large 
obtuse ones they form the greater part of the inner skeleton. 
The spimuate spicuwes (Plate 23, fig. 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. 3). These spi- 
cules 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 over, 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 con- 
stant, not exceeding 0,25 mm. 
The smaller hexradiate spicules (Plate 23, fig. 83, 9, 11) are of 
three separate kinds. In the largest the rays have a length 
of about 0,1 mm, two of the rays being a little longer than 
the other. The second kind of hexradiate spicules agree very 
much with the first mentioned. "The difference only consists 
in the size. The rays of these smaller spicules are 0,05 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 large hex(qwinque)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 muck 
longer than the others. The proportion between this ray and 
the other four is 3:1. This longer ray is slightly curvednamne 
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. 
