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I. Calcispongise 0. S.
Genus Aseetta H.
Aseetta coriacea M on t, (H.)
Piate 22, fig. 1—2.
Aseetta coriacea, Hseckel, Die Kalkschwämme, II, pag. 24, III, Taf. 3, Taf. -5,
Fig. 2 a—2 c.
sConnexive Varietät»:
Ascaltis coriacea new var.
Several specimens of this sponge were obtained during
the Swedish arctic expeditions. The outer shape agrees with
HjjeckeTs figures of the same species, especially with fig. 32
and 33, Plate 3. The anatomical structure corresponds very
nearly with H tee k el’s description, excepting the spicules. In
HteckeTs specimens there are spicules of only one kind,
viz. equiangular triradiate, the radii of the same size and the
apices obtusely pointed. Our specimens have also
quadri-radiate spicules. Three of the radii are almost of the same
size and equiangular, obtusely pointed as the radii of the
triradiate spicules. The fourth radius is more slender, a little
curved and sharply pointed. This radius is therefore very
different from the others, and since the quadriradiate spicules
are very rare, I believe that our specimens are a hitherto
unknown »Connexive Varietät» of Aseetta coriacea H., which
according to Hseckel ought to be called Ascaltis coriacea. The
tvpical and the more rare quadriradiate spicules are figured in
Plate 22, fig. 1—2.
At first I was a little doubtful whether I should identify
the species above-mentioned with Ascaltis canariensis Miklucho
(H.) or not. Our specimens almost agree with the figure, that
Haeckel has given of the species in op. cit. III, Plate 9, fig. 1.
Spicules triradiate agree with those of A. canariensis; but the
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