135 



Snabel varierer fra 20—50 Mm. Farven mat graagrøn 

 jned lidt mørkere brunliggrønne Papiller. 



Fundet i Finmarken, Tromsø og Hammerfest af M. 

 ,Sars og Danielssen, i Nordland, Bodø, af G. O. Sars. 

 Den lever dels i tomme Conchylier, dels frit paa sandig 

 Bund, 30—40 Favnes Dyb. Ved Norges Kyster er den 

 sjelden, derimod synes den at være temmelig almindelig ved 

 Grønland; thi derfra er Kjøbenhavner-Museet blevet for- 

 synet med mange Exemplarer. 



Som det vil erfares af Synonymien, have vi slaaet 

 Kefersteins Ph. boreale sammen med Sars's eremita, hvil- 

 ket vi anse os berettigede til, efterat vi have havt An- 

 ledning til at sammenligne baacle Sars's og Kefersteins 

 Originalexemplarer. 



FORKLARING OVER FIGURERNE. 

 Tal). 15, Fig. 45. Phascoiosoma eremita, aabnet. g Generations- 

 organet, omgivende Tarmspiralen; o slangeformigt Organ; 

 n Nervestreng; s, s Segmentalorgan er; r Retractorerne; 

 r 1 Retractorerne, dannende en Skede om Spiserøret sp. 



PHASCOLOSOMÅ (SIPUNCULUS) MABGA- 

 BITACEUM, m. s aes. 



(Tab. 15, Fig. 43—44). 

 Nyt Magazin f. Naturvidenskaberne, 6 B, 1851, Pag. 196. 

 Homalosoma læve, Ørsted (Mus. Hafn.) 

 Phascoiosoma Ørstedii, Keferstein. 

 Nachricht d. k. Ges. d. Wissensch. Göttingen. 1863, Pag 205. 

 Zeitschrift f. wiss. Zoologie, 15 B., Pag. 436, Tuf. XXXI, Fig. 8, 

 Taf. XXXIII, Fig. 39. 



Phascoiosoma Ørstedii, Keferstein. 

 Reisen nach d. Nordpolarmeer, 1870—71, v. M. Th. v. Heuglin, 

 3 Th., Pag. 246. 



Kroppen cylindrisk, i Bagenden kort tilspidset, over- 

 alt besat med meget smaa, spredte, ikke fremragende 

 Papiller, der danne ufuldkomne Tverrader, hvilke ere 

 tydeligst paa den bagerste Del. Huden er fast, glat, 

 perlemorglindsende, og under Loupen fint reticuleret. 

 Snabelen udgjør omtrent 3 | 4 Del af Kroppens Længde og 

 er besat med lignende Papiller. Munden rund, omgiven 

 med 3—4 Rader Tentakler, der ere conisk tilspidsede, 

 hvidgule og omtrent 50 i Tallet. Nærmest Mundranden 

 sidder paa hver Side en temmelig lang Tentakel, der paa 

 Spidsen er forsynet med et rundt orangerødt Pigment- 

 punkt. Naar Dyret udstrækker Tentaklerne, danne disse 

 i Begyndelsen en Conus, paa hvis Spidse de to Pigment- 

 pletter ere iøinefaldende. Musculaturen stærk og bestaa- 

 ende af et Lag Tver- og Længdefibre, der ikke danne 

 Bundter. Den indre Flade af Kropshulheden er stærk 

 perlemorglindsende. 4 Retractorer, hvoraf de ventrale 

 udspringe i den midterste Trediedel af Kroppen (Fig. 43 vr), 

 medens de dorsale udspringe langt derfra i den forreste 

 Trediedel (Fig. 43 dr). Alle 4 forene sig henimod Spidsen 

 af Snabelen. Ved Grunden af hver Bugretractor findes 

 et tyndt, slangeformigt Organ, der indeholdt Æg i for- 

 skj eilige Udviklingsstadier (Fig. 43 o). Nervestrengen af- 



The organ of generation surrounds, in the form of lamellæ, 

 nearly the whole of the spiral of the intestine, of which 

 only the posterior part is not covered (fig. 45 g). The 

 length of the animal with extended proboscis varies from 

 20—50 Mm. The color, dull greyish green, with a little 

 darker brownish green papillæ. 



Found in Finmark, Tromsø and Hammerfest, by 

 M. Sars and Danielssen; in Nordland, Bodø, by G. O. Sars. 

 It lives partly in empty shells, partly free, on sandy 

 bottom, at the depth of 30—40 fathoms. On the coast 

 of Norway it is rare, but seems to be rather common 

 on the coast of Greenland; for the museum of Copenhagen 

 has been supplied thence with many specimens. 



As will be seen by the synonymia, we have put Kefer- 

 steins Ph. boreale together with Sars' eremita, which 

 we consider ourselves justified in doing, after having had 

 occasion to compare both Sars' and Kefersteins original 

 specimens. 



EXPLANATION OF THE FIGURES. 

 Tal). 15, fig. 45. Phascoiosoma eremita opened, g organ of genera- 

 tion shewing the spiral of intestine; o serpentine organ; 

 n nervous cord; s, s segmental organs; r retractors; 

 r l retractors forming a sheath round the oesophagus sp. 



PHASCOIOSOMA (SIPUNCULÜS) MABGA- 

 B1TACEUM, M. Sabs. 



(Tab. 15, fig. 43-44). 

 Nyt Magazin for Naturvidenskaberne, 6 B. 1851, p. 196. 

 Homalosoma læve Ørsted (Mus. Hafn.) 

 Phascoiosoma Ørstedii, Keferstein. 

 Nachricht d. k. Ges. d. Wissensch. Göttingen. 1863, p. 205. 

 Zeitschrift f. wiss. Zoologie, 15 B., p. 436, Taf. XXXI, fig. 8, 

 Taf. XXXIII, fig. 39. 



Phascoiosoma Ørstedii, Keferstein. 

 Reisen nach d. Nordpolarmeer, 1870—71, v. M. Th. v. Heuglin, 

 3 Th., p. 246. 



The body cylindrical, at the posterior extremity shortly 

 tapered, everywhere covered with very small dispersed 

 not prominent papillæ, which form imperfect, transverse 

 rows most distinct in the posterior part. The skin is 

 firm, smooth, shining like mother of pearl, and appears 

 under the magnifying glass finely reticulated. The pro- 

 boscis forms about 3 / 4 of the length of the body, and is 

 covered with similar papillæ. The mouth circular, sur- 

 rounded with 3 — 4 rows of tentacles, which are conically 

 tapered, whitish yellow and about 50 in number. Nearest 

 to the mouth, there is on each side a rather long ten- 

 tacle having on its extremity a round, orange-red pigmen- 

 tary spot. When the animal extends its tentacles, they 

 form at first a cone, on the apex of which the two pig- 

 mentary spots are conspicuous. The muscular system is 

 strong, and consists of a layer of transverse and longi- 

 tudinal fibres, which do not form fascicles. The interior 

 surface of the perivisceral cavity is strongly lustrous like 

 mother of pearl. 4 retractors: the ventral ones having 

 their source in the middle third of the body (fig. 43 vr), 

 and the dorsal retractors commencing, at a distance from 

 this part, in the anterior third of the body (fig. 43 dr). 

 All 4 unite themselves towards the extremity of the pro- 



