67 



Hele G-astralhulheden med alle de deri værende Or- 

 ganer har en Endothelbeklædning, bestaaende af temmelig 

 lauge, eilierende Cylindercéller. Om hver Celle kun hai- 

 en Cilie eller flere, har ikke været muligt at bestemme. 

 Paa enkelte Steder af Yæggen synes der at være kun en; 

 Cellerne paa Svælgrøret har blot en lang Cilie. 



Findested. 



Station 51. Mange Exemplarer. hvoraf dog de fleste 

 vare stærkt kontraherede. idet de kom o]) af Skraben, og 

 strakte sig ikke mere ud. imedens nogle faa levede flere 

 Das;e i Observationskarret. 



Artskarakter. 



Dyrets Hoide er omkring 45""". Fodskiven tyk. rund, 

 bredere end Kolumnens nedre Del. Fodsaalen konkav, 

 foldet. Kolumnen er cylindrisk; de nederste tre Fjerdedele 

 have en membranos Skede. inkrusteret af plastisk Ler og 

 Biloeuliner. Den overste Fjerdedel nogen. urneformigt ud- 

 videt opad og forsynet med Længdefolder, der hver hai- 

 en Længderække af temmelig tætstaaende Suge vorter. 

 Mundskiven bred. fint foldet, med aflang Mund. Tentak- 

 lerne retraktile, afvexlende i 2 Rækker, 18 i hver. paa 

 Kroppens øverste Band. De i den indre Række ere korte, 

 afstumpede; i den ydre Række ere de overordentlig lange 

 og flagrende. Hele den nogne Del fuldstændig retraktil 

 og skjules under Kontraktionen ganske af Skeden, som 

 da danner en opretstaaende Kølle. Indenfor Skeden har 

 Huden Længdefolder med Sugevorter ligesom paa den 

 uøgne Del. Farven: Skeden er graahvid; indenfor den er 

 Kropshuden laxerod. ligesom paa den nogne Del. Mund- 

 skiven og de indre Tentakler morkere; de ydre Tentakler 

 ved Grunden og paa den aborale Side laxerøde. ellers hvide. 

 12 Septapar. alle fuldstændige , men hvoraf 6 Par ere 

 primære og golde. Cirkulærmusklerne mesodermale. 



Phellia norvegica, n. sp. 



Tab. IV. Fig. :,. ii; Tab. XIV. Fig. fi— 8. 



De to Exemplarer. der af denne Art bleve fundne, 

 vidde paa Skjæl af Astarte erebricostata. 



Fodskiven er rund. membranagtig udbredt, omtrent 

 8'"'" bred med en tynd Rand. Tab. IV, Fig. 5. 6. Under- 

 fladen er næsten plan og straalet fra Centrum mod Peri- 

 pherien. Overfladen. der er lidt hvælvet, danner, naar 

 Dyret ikke er fuldt udstrakt. en Halvkugle. Tal). IV. Fig. 6, 

 og er inkrusteret af fin Sand. 



The eiitire gastral-eavity, with all the organs lying 

 within it. has an endothelial covering consisting of rather 

 long. ciliating cylinder-cells. Whether eaeh cell has only 

 one cilia or several. it has not been possible to detennine. 

 In some parts of the wall there appears to be only om- ; 

 the cells on the æsophagus have only one long cilia. 



Habitat. 



Station No. 51. Many specimens. of which, however. 

 most were strongly contracted. as when they came up in 

 the dredge they did not again extend themselves. whilst a 

 fevv lived several davs in the glass vessel. 



Speciflc characteristics. 



The entire height of the animal is about 45""". The 

 pedal disc thick; round, broader thau the lower part of 

 the column. The pedal sole concave, folded. The column 

 cylindric; the lowest three-fourths part has a membranous 

 sheath encrusted with plastic clay and biloculina. The 

 uppermost fourth part bare, expanded in urn-shape above, 

 and furnished with longitudinal folds, eaeh of which has 

 a longitudinal series of pretty closely placed suckers. The 

 oral disc broad, finely folded. with oblong mouth. The 

 tentacles retractile, alternating in 2 series, 18 in eaeh. 

 on the uppermost margin of the body. The tentacles in 

 the inner series are short, blunted ; in the outer series they 

 are exceedingly long and waving. The entire bare portion 

 completely retractile. and quite hidden by the sheath during 

 contraction; the sheath then forms a vertical club. Inside 

 of the sheath the integument has longitudinal folds with 

 suckers similar to the bare part. The colour: The sheath 

 in greyish-white ; inside it the integument of the body is 

 salmon-red colour. similar to the bare part. Tlie oral 

 disc and the inner tentacles darker in colour; the outer 

 tentacles at the base and on the aboral side salmon-red 

 colour, otherwise white. 12 pairs of septa. all perfect but 

 of which 6 pairs are primary and sterile. Mesodermal 

 circular muscles. 



Phellia norvegica, n. sp. 



Pl. IV. fig. ".. (i: PL XIV. fig. 6—8. 



The two specimens of this species which were found 

 are seated on shells of Astarte erebricostata. 



The pedal disc is round. membranaceously expanded, 

 about 8 mm broad. with a thin margin (Pl. IV. fig. 5. li). 

 The under surface is almost plane and radiated from the 

 centre towards the periphery. The upper surface. which 

 is slightly arcuate. forms, when the animal is not fully 

 extended. a hemisphere (Pl. IV. fig. 6). and is encrusted 

 witli fine sand. 



