33 
are the result of the contraction of the Sponge is not to be discerned 
any more. The skeleton consists of the following kinds of spicules. 
1°. (tr°.) ac. f. [fig. 140.] The greater part of the spieules be- 
long to this kind, many of them forming transitions to 
2°, tr. ac. f. or tr°. ac. (f) [figg. 141, 142, fragments] with 
distinct heads. 
3°, tr?. f°. (sp.) [fig. 144]. The relation between the pinlike and 
 sub-pinlike needles and the little spined spieules which are espe- 
cially to be found on the surface of the Sponge, is to be seen in 
the illustration. The drawings were made with the same magnifying 
power, and with the aid of the Camera lucida. Besides these occur 
4°. ac?. f°. (sp.) [fig. 143] always larger than the preceding 
ones; on both the spines are very minute; a rather high power 
is necessary to detect them. Carter has described a Sponge from 
the Barents-Sea, which appears to be nearly allied to our species. 
The diagnosis for his Suberites montalbidus is: „Form monticular. 
Colour grey-white. Surface corrugated. Vents, one large on the 
summit, naked, the rest small, on ihe sides. Texture soft, matted. 
Spieules of two kinds, viz.: 1. skeleton, large, subpinlike, head 
variable in shape; 2. flesh-spicule, minute, shaft cylindrical, straight 
or curved, pointed at each end and inflated in the centre”. I have 
however stated that the spines on the „tHesh-spicules” are very 
minute; it is possible that Carter has overlooked them, and he may 
even have overlooked the small bluntly ended spicules [tr? £° (sp.)]. 
In that case I believe both Sponges to be identical. As yet I sup- 
pose that we have seen different individuals from one species, and 
I have labelled it for the collection with the name Suberites spec. 
(montalbidus Ortr.?) 
15. Pachychalina caulifera n. sp. [Pl. I, fig. 14; pl. III, 
figg. 64—66]. 
Diagn. Corpus elongatum, compressum, quasi remiforme. Basis la- 
pidibus vel conchis haerens. Oscula in uno latere plurima, 
in altero nulla. Spicula indicantia: ac?. f. 
Loc. Barents-Sea ? 
VOSMAER, Sponges. c 
