181 



heden og henimod Tentakelkrandsen, hvor den som sæd- 

 vanligt med to Grene omfatter Spiserøret. 



Kroppen er rustfarvet; Snabelen er ved Grunden gul, 

 forresten næsten hvid, perlemor-glindsende. 



Den er funden i Hardangerfjorden og Korsfjorden 

 paa en Dybde af 100 — 200 Favne, sandig — leret Bund. 

 Paa enkelte Localiteter ikke saa ganske sjelden. 



Af denne Art findes et Par Farvevarieteter, den ene 

 olivengrøn, som først fandtes af Danielssen i Hardanger- 

 fjord og senere af G. O. Sars i Lofoten, og som af M, 

 Sars er bleven benævnt Phascolosoma olivaceum, uden 

 dog at blive beskrevet. — Den anden Varietet er dels 

 brun med grønne Pletter, dels grøn med brune Pletter. 

 Begge disse Varieteter findes paa de samme Steder som 

 Hovedformen. 



AKTSCHARACTEREN. 

 Kroppen kølleformig, overalt besat med faste, flade, 

 uregelmæssig formede, ophøiede Skjæl. Snabelen omtr. 

 2V 2 Gang saa lang som Kroppen, besat med Papiller og 

 forsynet med 8 Tentakler. En Retractor. Et Segmen- 

 talorgan. 



FORKLARING OVER FIGURERNE. 



Tal». 13, Fig. 11. Phascolosoma squaraatum, lidt forstørret. 



Tab. 14, Fig. 14. Den samme, aabnet, forstørret, g Æggestok; 

 n Nerve; r, r Retractor med 4 Rødder; t Tarm; ts spiral- 

 förmig Tarmslynge ; sp, sp Spiserør; re Rectum; m Muskel; 

 s Segmental organ; Te, h contractilt Kar. 



Fig. 14 A. Tværsnit af Snabelen for at vise Forholdet mellem Re- 

 tractor, Spiserør, Nervestreng og contractilt Kar. 



Fig. 15. Gjennemsnit af Huden af Phascolosoma squamatum, 600 

 Gange forstørret, a Hudlegeme; h Udførselsgang; c Cuti- 

 cula; e Cuticularepithel; 1,1, l Længdemuskler; Gjennem- 

 snittene af Fibrene liggende i Rum af et netformigt, rør- 

 dannende Sarcolemma, hvori Kjerner; f Ringmuskler; 

 p Peritoneum. 



PHASCOLOSOMA ABYSS0RU3L, Nobis. 

 (Tab. 14, Fig. 25-27). 

 Kroppen valseformig, 30 Mm. lang, 2,5 Mm. bred, 

 glat, overalt besat med en Mængde fine uregelmæssig tæt- 

 staaende Hudlegemer, der ikke danne Papiller. Den ba- 

 gerste Ende af Kroppen er afstumpet, og paa Midten 

 sees en liden vorteformig Fremstaaenhed, der kan ind- 

 trækkes, og da fremkommer en liden Grube. Snabelen, 

 omtrent en Fjerdedel saa lang som Kroppen, er paa 

 Grunddelen besat med yderst fine Papiller; derimod er 

 dens midterste Del ganske glat, og dens forreste Del, der 

 næsten er kugleformig, er forsynet med 10—12 Ringe med 



and it extends forward up towards the segmental organ, 

 and backward right to te bottom of the perivisceral cavity. 

 The segmental organ has the form of a pear, and 

 lies on the left side of the retractor, immediately in 

 front of the intestinal spiral. The nervous cord goes 

 straight from the bottom of the perivisceral cavity and 

 towards the tentacular circlet, where as usual it sur- 

 rounds the oesophagus with two branches. 



The body is of a ferruginous color; the probosc 

 is at the basis yellow, otherwise nearly white, shining 

 like mother of pearl. 



It is found in the Hardangerfjord and in the Kors- 

 fjord, at a depth of 100—200 fathoms, on sandy — clayey 

 bottom. In some localities it is not so very rare. 



Of this species a few colored varieties are found: 

 one is olive-green, first found by Danielssen in the Har- 

 dangerfjord, and subsequently by G. O. Sars in Lofoten, 

 and named by M. Sars Phascolosoma olivaceum, without 

 however being described. The other variety is partly 

 brown with green spots, partly green with brown spots. 

 Both these varieties are found in the same places as the 

 main form. 



SPECIFIC CHARACTERISTICS. 

 The body claviform, everywhere covered with firm, 

 flat, irregularly shaped, elevated scales. The proboscis 

 about 2V2 times as long as the body, covered with pa- 

 pillæ, and furnished with 8 tentacles. One retractor. 

 One segmental organ. 



EXPLANATION OF THE FIGURES. 



Tal). 13, fig. 11. Phascolosoma squamatum, slightly magnified. 



Tab. 14, fig. 14. The same opened, magnified, g ovary; n nerve; 

 r, r retractor with 4 roots; t intestine ; ts spiral circum- 

 volutions of intestine; sp, sp oesophagus; re rectum; 

 m muscle; s segmental organ; k,lc contractile vessel. 



Fig. 14. A. Transverse section of proboscis shewing the connexion 

 between the retractor, the oesophagus, the nervous cord 

 and the contractile vessel. 



Fig. 15. Section of skin of P. squamatum, magnified 600 times. 

 a cuticular body; b excretory duct; c cuticula; e cuti- 

 cular epithelium; I, I, I longitudinal muscles. The sections 

 of the fibres lying in the space of a reticulated tubular 

 sarcolemma in which lie the nuclei; r the annular muscles; 

 p peritoneum. 



PHASCOLOSOMA ABYSSOBUM, Nobis. 

 (Tab. 14, fig. 25—27). 

 The body cylindrical, 30 Mm. long, 2,5 Mm. broad,, 

 smooth, everywhere covered with a number of fine irre- 

 gularly densely collected cuticular bodies, which do not 

 form papillæ. The posterior end of the body is obtuse; 

 and on the middle there appears a little wart-like promi- 

 nence, which can be retracted, producing then a little 

 hollow. The proboscis, about a fourth part as long as 

 the body, is on the basal part covered with extremely 

 fine papillæ; but its middle part is quite smooth; and 

 its anterior part, which is nearly globular, is furnished 



