VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 405 
I. Calcispongie 0. 5. 
Genus Ascetta H. 
Ascetta coriacea Mont. (H.) 
Plate 22, fig. 1—2. 
Ascetta coriacea, Heckel, Die Kalkscehwämme, II, pag. 24, III, Taf. 3, Taf. 5, 
Fig. 2a—2 ec. 
> Connexive Varietät>: 
Ascaltis coriacea new var. 
Several specimens of this sponge were obtained during 
the Swedish arctic expeditions. The outer shape agrees with 
Heckel's figures of the same species, especially with fig. 32 
and 33, Plate 3. The anatomical structure corresponds very 
nearly with H&eckel's description, excepting the spicules. In 
Heckel's 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 tri- 
radiate 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 
arter very fare, I believe that our specimens are ar hitherto 
unknown »Connexive Varietät> of Ascetta coriacea H., which 
according to Heckel ought to be called Ascaltis coriacea. "The 
typieal 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 
eckel hastowen of vherspeeiesi in op. ciw. IIT, Plate 9, fig: I. 
Spicules triradiate agree with those of ÅA. canariensis; but the 
