THEEL, NORTHERN AND ARCTIC INVERTEBRATES. I. SIPUNCULIDS. 
ot 
[AS 
Sipunculus priapuloides KoREN and DANIELSSEN. 1875 and 1877. 
Pl. IX, Figs. 137—145. Pl. X, Figs, 146—150. PI. XV, Fig. 213. 
Phallosoma priapuloide. LEVINSEN 1882 and 1883.' 
Habitat: 
West Coast of Norway: Korsfjord and Söndfjord, near Bergen, at a depht of 
100 to 200 fathoms, clay — Lofoten, blue clay, 311 and 624 m. North Sea: 64” 48' n. 
— 6" 36 e., sabulous clay, 283 m., bot.-temp. 679. (Mus. B-). 
General distribution: 
Atlantic Ocean (RouLrE "”). 
I am indepted to Dr A. APPELLÖF for having given me an opportunity of exa- 
mining some samples of this highly interesting species, preserved in the museum of 
Bergen. They deserve a far more exact anatomical and histological investigation 
than I have been able to make, owing to the unsatisfactory state of preservation of 
the materials at my disposal. However, the object of this paper is not primarily 
to enter upon a treatment of fine anatomical details. Notwithstanding this, I have 
subjoined some observations, which may complete to some extent the descriptions of 
KOREN and DANIELSSEN, which, as it seems to me, leave much to be desired. 
The Figure 213, which illustrates the tentacle-erown, shows that it forms a 
membranous disk, which protrudes about twelwe main lobes, each divided into two 
lobules, which in their turn also may be bipartite. In the specimens examined by 
me, the tentacles were in a state of contraction, each lobule presenting a number of 
oblique ridges and furrows. The edge of the lobules has a wavy aspect. It seems 
likely that the ridges, when the tentacles are fully extended, protrude beyond the 
edge, so that the lobes get a pinnatified aspect. In the state of contraction, the 
lobes forcibly remind one of leaves with their veins. 
As to the papille and the corpusecles of the skin, which are to be observed 
principally on the proboscis, it appears that KOREN and DANIELSSEN neglected them 
considerably. Concerning them they only say: "The proboscis is about '/s as long 
as the whole animal, furnished with large prominent conical papille, which form 
longitudinal rows and become smaller towards the oval aperture'. I must indeed 
myself confess that the arrangement of the papille in longitudinal rows is very in- 
distinct. Referring, however, to Figs. 140—145, I should like just to accentuate the 
fact that the papille of the hinder part of the proboscis are larger and resemble 
 obtuse, triangular, chitonous hooks directed backwards, and that they decrease an- 
teriorly, so that those lying most in front present themselves as small rounded ele- 
vations. In the skin of the trunk itself small scattered groups of rouded corpuscles 
are to be found (Fig. 148). In the posterior extremity of the body these corpuscles 
are scattered and not aggregated in groups. 
ONE 
> Géphyriens. Résult. scient. de la Campagne du »Caudan». Fasc. III. Paris & Lyon 1896. 
