47 



Findested. 

 Station 323. 1 1 Exemplarer af forskjellig Størrelse. 



Slægtskarakter. 



Fodskiven rund med bugtet Rand. Kroppen cylindrisk, 

 dækket af en seig Hud, inkrusteret af Sand og Skjælstumper ; 

 indenfor samme — paa den egentlige Hud — en Mængde 

 udprægede Sugevorter. stillcli' i Længderækker. Mundskiven 

 foldet; Tentaklerne retraktile i faa Rækker. Fremtrædende 

 endodermale Cirkulærmuskler. Mange fuldstændige Septa. 



Artskarakter. 



Fodskiven rund, dobbelt saa bred som Kolumnen, med 

 tyk Rand og stærkt foldet Underflade. Kroppen cylindrisk, 

 indtil 30""" høi og saavel som Fodskiven omgiven af en 

 Membran, inkrusteret af Sand og Skjælstumper. Indenfor 

 denne Membran er Kropsvæggen forsynet med Sugevorter 

 i tætte Længderækker. Mundskiven fint foldet. Tentakler 

 i 3 Rækker, omtrent saa lange som Mundskivens Bredde. 

 Farven: Den inkrusterede Del er hvidgraa; den nøgne Del. 

 ligesom Tentaklerne, er paa nogle Exemplarer bleg, skidden 

 hvidgul med en mørkere Mundskive, paa andre tegelstens- 

 rød. De rødfarvede Tentakler have paa Midten en mørkere 

 Ring, imedens Enderne ere lysere; de hvidgule have paa 

 Midten af deres adorale Side en hvid Halvring. 



Familie Madoniactidæ. 



Hexactinier med faa principale Septa, Acontier og et udpræget 

 endodermal-cirkulært Muskelsystem. 



Madoniactis x lofotensis, n. g. et sp. 



Tab. I, Fig. .",; Tab. VIII, Fig. 1. 



Fodskiven er noget bredere end Kolumnen, rund og 

 dens Rand er tyk og noget unduleret. Dens Underflade 

 er rynket og svagt radieret fra Centrum mod Peripherien. 



Kroppen er cylindrisk, omtrent lige hoi som bred ; 

 dens Overtlade er saagodtsom glat og glindsende; kun naar 

 Dyret er lidt sammentrukket, sees med Loupen yderst smaa, 



Habitat. 

 Station No. 323. Eleven specimens of different sizes. 



Generic characteristics. 



The pedal disc round with indented margin. The 



body cylindrical. covered with a tough integument encrusted 

 with grains of sand and fragments of shells; inside of this, 

 on the integument-proper, a multitude of distinct suckers 

 placed in longitudinal series. The oral disc foldeil. The 

 tentacles retractile, placed in few series. Prominent eudo- 

 dermal circular inuscles. Numerous perfect septa. 



Specifie characteristics. 



The pedal disc round. twice as broad as the colunin, 

 has a thick margin and strongly folded under-surface. The 

 body cylindrical, measures up to 30""" in height; it, as 

 well as also the pedal disc. is surrounded by a membrane 

 encrusted with grains of sand and fragments of shells. 

 Inside of this membrane the body-wall is furnished with 

 suckers in compact longitudinal series. The oral disc 

 finely folded. The tentacles placed in 3 series, about as 

 long as the breadth of the oral disc, Colour. The encrusted 

 portion whity-grey; the exposed portion, and also the ten- 

 tacles, are, in a few specimens, pale dirty whity-yellow with 

 a darker oral disc, in others again brick-red. The 

 red coloured tentacles have a darker annulus in the middle, 

 whilst the extremities are lighter; the whity-yellow ten- 

 tacles have a white crescent in the middle of their adoral 

 surface. 



Family Madoniactidæ. 



Hexactiniæ with few principal septa, acontia, and a prominent 

 endodermal circular muscular svstem. 



Madoniactis l lofotensis, n. g. et sp. 

 Pl. I, rig-. r, ; Pl. VIII, fig. i. 



The pedal disc is somewhat broader than the colunin, 

 and is round; its margin is thick and somewhat undulating. 

 The under-surface is wrinkled, and faintly radiated from the 

 centre towards the periphery. 



The body is cylindrical. about the same in height 

 as in breadth; its external surface is al most smooth, and 

 shining. Only when the animal is a little contracted can 



1 [jiaSbma = Vandlilje. 



1 |j.<x8u'ua = Waterlily. 



