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The large and long acerate spicules (Plate 24, fig. 22) are very
numerous, forming the greater part of the radiating fasciculi.
The length is 3,5—5 mm. They have the greatest diameter at
the middle, tapering towards the fine and long points. They
are usually straight, sometimes, bowever, slightly curved towards
the terminations.
The small acerate spicules (Plate 24, fig. 23). These spicules
are less numerous than the large ones and more variable in
size. Most of these spicules are 0,8 mm in length.
The porrecto-ternate spicides (Plate 24, fig. 24, 25). These
spicules are very slender, generally curved towards the points.
One of the three branches is usually longer than the other two.
The length of the shaft of this spicule is about 0,3 mm, the
short branches 0,o7 mm and the long one about 0,i4 mm in
length. The branches are generally straight.
The recurvo-ternate spicules (Plate 24, fig. 26) are slightly
thicker than the porrecto-ternate; they are also slightly curved.
The length of the shaft is 3,5 mm; the branches are of the
same size, viz. 0,i4—0,2 mm. Both these last-mentioned spicules
occur in about the same quantity.
The sigmoid bihamate spicules (Plate 24, fig. 27, 28) are very
numerous; their length is about 0,o3 mm.
This species lias a certain resemblance to Tetilla polyura
O. S.*), as in the porrecto-ternate spicules, in the knotty
surface, and in the ovoid form. But our new species of Tethya
has not sigmoid-bihamate spicules of the same kind as T.
polyura O. S. In the last-mentioned species these spicules are
knotty, but they are smooth in Tethya sibirica Fristedt. The
roots are not of the same structure. Besides, the surface of T.
polyura O. S. is more hispid than that of Tethya sibirica Fristedt,
Colour. The colour of specimens preserved in spirit is
yellowish or yellowish grey.
Habitat. Chatanga Bay, Lat. 75°, Long. 113° 50’ E., depth
15 fathoms (41 V.); Actinia Bay, depth 5—10 fathoms (29 V.);
Pitlekai (1006 V.).
*) O. Schmidt, Grundziige einer Spor.gienfauna des Atlantischen
Ge-bietes, 1870, pag. 66, Taf. 6, Fig. 8.
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