KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 39. N:0 |. 67 
Tf one takes into consideration the relations between the tentacle-erowns of 
Phascolosoma Hanseni and margaritaceum, there seems to exist a surprising resem- 
blance, and I believe that nobody is able to draw a true line of demarcation between 
them. Ph. Hanseni is said to be considerably larger, it is true, and its colour is also 
noted as singular. In consequence of its greater size, the number of its tentacles 
must, of course, be greater. But in this case the difference between the two forms 
in question is not significant, since it is proved that an individual of Ph. margari- 
taceum from Tromsö is in possession of no less than 104 tentacles. The type of Ph. 
Hanseni examined by me has 140, and according to DANIELSSEN and KOREN their 
specimen is provided with 180 tentacles. 
In consequence of what has been said above, the arrangement and especially 
the number, of the tentacles do not justify the creation of a new genus. On the 
contrary, the tentacle-erown closely resembles that of Ph. margaritaceum (Fig. 192). 
To judge from the "specific character” of the two Norwegian investigators, the two 
forms in question differ mainly in colour and in the presence or absence of a spindle- 
muscle. Concerning the latter I do not believe that it is in fact attached to the 
posterior extremity of the body, as DANIELSSEN and KOREN say; their statement 
must depend upon a faulty investigation. It must be admitted, on the contrary, that 
the colour seems to be rather dissimilar. In Ph. margaritaceum it is said to be 
"bluish white or pearl-orey”" with the tentacles ”whitish yellow"; and in Ph. Hanseni 
the colour of the trunk is said to be "olive-green, proboscis lighter, throat rosy red. 
Oral disk almost white, transversed by 10 red-coloured stripes. Tentacles rosy.'”' 
Im the State Museum two fragmentary specimens are preserved, which were 
dredged up in 1898 at Spitzbergen from a depth of 400 m. They closely resemble 
those fragmentary types which were lent to me from the Bergen Museum. Like 
these specimens they are contracted to such a degree that is it impossible to form a 
true conception of the glands of the skin and their true appearance, Fig. 41. Further 
investigations are necessary. 
»Forma orientalis.»> 
Habitat: 
Siberia: (Veg. Exp. 1879 without definite locality), I sp. — Pitlekay (Veg. Exp., 
July 1879), 14 sps. — 62” 39 n.—177” 5' w., Behring Strait, gray mud, 55 fms. 
(Vega Exp. ”/s 1879), 2 sps. 
Among the rich collections of marine animals, which were brought home by the 
"Vega- Expedition", a number of gigantic Phascolosoma-forms are to be seen, which, 
however, are in such a bad condition, that an investigation of them would give but 
very insufficient results. 
If I take it for granted, that the description of the general organisation of Ph. 
Hanmnseni given by DANIELSSEN and KOREN is correct, I am unable to detect any 
other characters distinguishing this species from the Siberian forms than those relating 
to the size of the animals, to the relation between the trunk and the proboscis, to 
