KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 39. N:o l. 63 
Phascolosoma margaritaceum (SARS 1851), KOREN and DANIELSSEN 1875 and 1877. 
Pl. TII, figs. 29—33, Pl. IV. figs. 34—387, Pl. XII. fig. 174, Pl. XIV, figs. 192-—196, 
Sipunculus margaritaceus SARS 1851. 
Phascolosoma Oerstedii KEFERSTEIN 1865, ThEEL 1875. 
Phascolosoma fulgens THÉEL 1875 (Jun. ?). 
Phascolosoma albidum THÉEL 1875 (Jun.). 
Considering that in the course of time the original specimen of Ph. fulgens has 
been spoiled by desiccation, I am not able to state its true relationship. I am in- 
elined to regard it as a young specimen of Ph. margaritaceum, in spite of its narrow cy- 
lindrical shape of body and its bright, transparent skin telling against this supposition. 
On the other hand, it is probably indisputable that Ph. albidum is a young form of 
the species in question, a view already enunciated by KOREN and DANIELSSEN. In 
young individuals the minute papille, which are seen at the posterior extremity of 
the body, are proportionally more prominent, but the reticular structure of their skin 
is almost imperceptible. 
The species in question is evidently subject to rather considerable variations, 
especially with regard to the number of the tentacles and the structure of the skin. 
For the present, therefore, I think it desirable to keep apart two forms a westerly 
one, Forma Finmarchica, and an easterly one, Forma sibirica. Nevertheless, they may 
very likely be representatives of the same species. 
"Forma finmarchica.'” 
Habitat: 
Greenland: Cape Dudley Digges, 76” 91' n.—68” 28 w., mud, 30—45 m. (E. 
Nilsson ”/; 1894), 4 sps. — Umanak, mud and clay, 200 fms. (Amondsen), 1 sp. — 
Christianshaab, mud, 15—30 fms. (Öberg ””/; 1870), I sp. — Godthaab, shells, 80—100 
fms. (Amondsen, July 1863), 3 sps. Julianehaab, 170 fms. (Amondsen), I sp. — 
S. E. of Clavering Island, 74? 10' n.—20” 8 w., mud with shells and stones, 20—40 
m. (Gr. Exp. ''/; 1899), 5 sps. — S. of the small Pendulum Island, 74” 35 n.—18” 
23' w., sandy mud and alg&e (Gr. Exp. '/; 1899). 
Spitzbergen: Castrén's Island, mud and stones, 30—40 fms. (Sp. Exp: /, 1868), 3 sps. 
— Shoal Point, stones and mud, 15 fms. (Sp. Exp. ''/; 1861), 1 sp. — Mossel Bay, alge, 
7—30 fms. (Sp. Exp. 1872—73), 6 sps. — Cross Bay, sandy mud, 2—3 fms. (Sp. Exp.), I sp. 
— King Bay, sandy mud, 5—7 fms. (Sp. Exp. ””/s 1868), I sp. -— Ice Fjord, Safe Harbour, 
mud, 30 fms. (Sp. Exp. ”'/. 1864), 1 sp. and 78?” 27 n.—15” 20' e., fine brown clay, 175 m. 
(Sp. Exp. ''/; 1898), I sp. — Bel Sound, stones and zoophyta, 30—35 fms. (Sp. Exp-), 2 sps. 
— Horn Sound, stones and mud, 40—60 fms. (Sp. Exp.), 7 sps. — The mouth of Stor 
Fjord, stones and mud, 100—120 fms. (Sp. Exp. ””/; 1868), 1 sp: and 76” 50 n.—17” 
20' e., stones with Laminaria, 14—18 fms. (Sp. Exp. ”/s 1898), I sp. — Foster's Is- 
lands in Hinloopen Strait, stones, 40 fms. (Sp. Exp: 1861). I sp. — Lovén's Mount 
