22 
Bowerbank '). But as this Sponge possesses the curious „short 
fusiformi-eylindrical ineipiently-spined retentive spicula” (Bowerbank) 
and these are not present in the speeimen under description, so it 
can’t been identified. 
3°. tr°. ac. (?) In some parts of the body I have found this kind 
of spieules, but I think they don’t belong to the Sponge. It seems 
that this species (and others!) easily take in foreign objects. I have 
not only found plenty of Foramiferes, but also spieules of other 
Sponges: anchors of Desmacidinae, hexradiates of Hexactinellidae 
etc. I have thought a long time that I had found in these Geodidae 
of the Arctic Sea, transitions to the Hexactinellidae; for I rather 
often found hexradiate spieules, and totally complete. But now I 
am convinced that they don’t belong to the Isops, Geodia or any 
else. We learn however from these facts that even in the Arctie 
Seas Hexactinellidae live 
4°. M. ta. = 90°. The shafts of these spicules end very often 
blunt, about in the same manner as the tr”. The teeth (d) are 
rather straight, long and not very thick. 
5°. M. ta. 2> 90°. There are two kinds. 1°. with geniculated 
teeth, just as /. pallida (Pl. IL, fig. 22). The shaft of these ends 
nearly always blunt. 2°. with straight teeth; they are not so thick 
as those with geniculated teeth (Pl. III, figg. 58). The angle Din 
both is about 115°. 
6°. M.. ta. @©< 90°. There are two kinds, viz. one with short 
teeth, another with ordinary teeth (fig. 59 and 60, Pl. I). They 
are not very frequent, but always present. 
7°, M. ta. d. bif. of the common shape. Very rare. 
8°. gl. As usual. 
9°. st. The stellates are of different sizes. 'The larger ones are 
represented in fig. 61, Pl. III, the smaller ones in fig. 62. 
10°. glst. The sphero-stellates have about the same size as the 
small st. (fig. 63, Pl. ID). 
The oscula on the top of the Sponge have at superficial exami- 
1) 1. c. tab. XLVIH. 
