30 THEEL, NORTHERN AND ARCTIC INVERTEBRATES. I. SIPUNCULIDS. 
two longish roots." I am able to state that in reality there exist two ventral retractors, 
which embrace the nervous cord. Fig. 2 on Plate I in the work by DANIELSSEN 
and KOREN is imeorrectly drawn. 
Phascolosoma glaciale (DANIELSSEN and KOREN 1881). 
Oncehnesoma glaciale DANIELSSEN and KOREN 1881. 
Habitat: 
North Atlantic Sea, 67” 56' n.—4” 11' w., Biloeulina clay, 1423 m. (Mus. B.) 
3 specimens. 
Distribution in General: 
North Atlantic and Arctic Seas: 65” 53' n.—7” 18' w., Biloculina clay, 2127 m. 
— 69” 2 n.—11” 26' w., Biloculina clay, 1836 m. — 68” 6 n.—9” 44' e., blue clay, 
1159 m. — 73” 47 n.—14” 21 e., Biloculina clay, 1403 m. (Numerous specimens, with 
their long probosces interlaced. DANIELSSEN and KOREN 1881.) According to RouLE' 
Phascolosoma glaciale has been caught as får towards the South as in the Gulf of 
Gascogne. 
I have had the opportunity of studying 3 specimens, which were dredged up 
by the Norwegian North-Atlantic Expedition of 1876—1878, but unfortunately they 
have been dried up and are in such a bad state of preservation, that no real exa- 
mination of them is possible. The distance between the anus and the posterior 
extremity of the trunk amounts to about 25 mm., and the proboscis measures slightly 
more than 26 mm. Thus, the proportion between the length of the proboseis and 
the trunk does not agree with the statement of DANIELSSEN and KOREN, who say 
that the former is about twice as long as the latter. The diversity may be due to 
different degrees of contraection, but also to non-coincident views as to the confines 
of the two parts of the body. 
The proboscis of thread-like fineness diminishes towards the free extremity like 
a whip-lash, and ends in a tentacular or oral disk, which is devoid of tentacles and 
is evidently similar to that of Ph. Sabellarige. The skin is hyaline, smooth and, as 
it seems to me, almost devoid of papille. According to DANIELSSEN and KOREN 
there are to be seen at the posterior extremity of the trunk "very sparmgly minute, 
irregularly scattered papille”". According to my observations, the proboscis has a 
girdle behind the tentacular disk, which is in possession of very minute papille an- 
teriorly, and of somewhat larger, rounded ones posteriorly. In one case at least I 
have seen between the smaller and larger papille 2 or 3 irregular rings with scattered 
acute hooks. Immediately behind this verrucose space a second, broad girdle of hooks 
is present, the hooks being ecrowded together, and arranged in at least 17 irregular rings. 
They display a sharply pointed form, the point itself being either turned upwards or, more 
seldom, downwards; in the former case the dorsal side is concave, in the latter convex. 
! Résultats scientifiques de Ia Campagne du »Caudan» dans le Golfe de Gascogne, Paris & Lyon, 1896, 
