129 



ikke befæstet. S egm entalorganerne ere meget lange, ind- 

 tage omtr. V 4 af Kroppens Længde, ere stærkt contrac- 

 tile, hvorved de paa flere Steder danne blæreformige Ud- 

 vidninger (Fig. 18 s, s); nogen Aabning paa den frie Ende 

 findes ikke. Kingmusklerne danne saagodtsom et eneste 

 Lag, dog sees i den bagerste Del af Kroppen enkelte 

 Fibre at vige fra hinanden, uden dog at danne særskilte 

 Strenge. Længdemuskellaget danner i den forreste Halv- 

 del af Legemet en sammenhængende Muskelhud; ved Seg- 

 mentalorganernes Befæstningssted udskille derimod Læng- 

 demusklerne sig som særskilte, temmelig langt fra hin- 

 anden staaende, brede Bundter, der ere omtrent 24 i 

 Antal (Fig. 18 Im). Disse Muskelbundter anastomosere 

 tildels med hinanden, og strække sig mod Kroppens ba- 

 gerste Ende, hvor de blive smalere og svagere fremtræ- 

 dende. De tvende Bugretractorer tage deres Udspring 

 omtrent paa Kroppens bagerste Trediedel fra Længde- 

 musklerne med 6 korte Rødder, der strax smelte sam- 

 men til en bred Basis. Fra denne brede Grunddel gaa 

 de convergerende paa hver sin Side til henimod Segmen- 

 talorganernes Tilhæftningssted, hvor de med deres Rande 

 smelte sammen, og danne derved lige op til Mundaab- 

 ningen ligesom en Skede, hvori Spiserøret ligger (Fig. 18 

 br). Rygretractorerne udgaa med 3 korte Rødder, der 

 danne deres småle Grunddel, fra Længdemusklerne, noget 

 foran Bugretractorernes Udspring; de ere temmelig tynde 

 og forene sig snart med Bugretractorerne. Ved disses 

 Grunddel sees et tyndt, slangeformigt Organ, der ligesom 

 omsnoer deres Basis (Fig. 18 o, o). Kropshulheden og de 

 i den indesluttede Organer ere beklædte med et Perito- 

 neum, hvori findes Celler. Saavel dette, som de i Huden 

 indesluttede Legemer (Kjertier), ere beskrevne i den ge- 

 nerelle Del, hvortil henvises. Generationsorganet om- 

 giver omtr. de 2 bagerste Trediedele af Tarmspiralen 

 som en compact Masse (se den generelle Del). Farven 

 lysegraa med perlemoragtig Glands. Papillerne mørkere. 

 Fundet i Bergensfjorden, 50 Favnes Dyb, stenet Bund, 

 kun 1 Exemplar. 



ARTSCHARACTEREN. 

 Kroppen næsten kølleformig, papilløs. Snabelen ind- 

 tager næsten Dyrets halve Længde. Papillerne paa dens 

 bagerste, bredere Del ere store, og danne et bredt Belte. 

 Mundaabningen tværspaltet, paa den øverste Læbe en 

 dobbelt Række Tentakler, omtr. 30, Længdemusklerne 

 danne paa den bagerste Halvdel af Legemet tydelig ad- 

 skilte Bundter (omtr. 24). Farven lysegraa med mørkere 

 Papiller. 



FORKLARING OVER FIGURERNE. 



Tab. 14. Fig. 17. Phascolosoma Lovénii i naturlig Størrelse. 

 Fig. 18. Samme aabnet. g Generationsorganet; Ir Skeden for 

 Spiserøret; Im Længdemuskler; o, o slangeformige Or- 



in a short rectum, which is attached by a number of 

 tendinous filaments to the longitudinal muscles (Fig. 18 r). 

 Below, the intestinal canal is not attached. The seg- 

 mental organs are very long, occupying about V 4 of the 

 length of the body; they are strongly contractile, whereby 

 they form in many places bladder-like enlargements (fig. 

 18 s, s); there exists no opening at the free extremity. 

 The annular muscles form almost a single layer ; still in 

 the posterior part of the body some fibres appear, reced- 

 ing from each other, although without forming separate 

 cords. The longitudinal layer of muscles forms, in the 

 anterior half of the body, a continuous muscular membrane ; 

 but at the place of attachment of the segmental organs, 

 the longitudinal muscles appear as separate, rather distant, 

 broad fascicles, which are about 24 in number (fig. 

 18 lm). These fascicles of muscles partly anastomose 

 with each other, and extend towards the posterior ex- 

 tremity of the body, where they become narrower and 

 less conspicuous. The two ventral retractors take their 

 issue, about on the posterior third part of the body, 

 from the longitudinal muscles, with 6 short roots, which 

 immediately coalesce to a broad base. From this broad 

 basis, they proceed, converging each on its side, towards 

 the place of attachment of the segmental organs, where 

 they coalesce with their margins, thereby forming right 

 up to the oral aperture, as it were, a sheath wherein 

 the oesophagus lies (fig. 18 br). The dorsal retractors 

 issue, with 3 short roots which form their narrow basis, 

 from the longitudinal muscles, somewhat in front of the 

 source of the ventral retractors; they are rather thin, 

 and soon unite with the ventral retractors. At the basal 

 part of the latter, there appears a long serpentine organ 

 which in a manner winds round their base (fig. 18 o, o). 

 The perivisceral cavity and the organs contained in it 

 are covered with a peritoneum wherein cells exist. This 

 peritoneum, and likewise the bodies (glands) contained in 

 the skin, are described in the general notice, to which 

 we refer. The organ of generation surrounds about the 

 2 posterior third parts of the intestinal spiral like a 

 compact mass (see the general notice). The color is. 

 light grey with mother of pearl lustre. The papillæ darker. 

 Found in the Bergensfjord at the depth of 50 fathoms, 

 stoney bottom, only 1 specimen. 



SPECIFIC CHARACTERISTICS. 

 The body nearly club-shaped, with papillæ. The 

 proboscis occupies nearly half the length of the animaL 

 The papillæ on its posterior broader part are large, and 

 form a broad belt. The oral aperture a transverse fissure; 

 on its upper lip a double row of tentacles about 30. The 

 longitudinal muscles form, on the posterior half of the 

 body, distinctly separate fascicles (about 24). The color 

 light grey with darker papillæ 



EXPLANATION OF THE FIGURES. 

 Tab. 14, fig. 17. Phascolosoma Lovénii, natural size. 

 Fig. 18. The same opened, g the organ of generation; br the 

 sheath of the æsophagus; Im longitudinal muscles; o,o> 



