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Mundskiven er lidt hvælvet, henved 40""" bred og fint 

 foldet. Folderne ere under lidt Kontraktion nogefophoiede. 

 smalere ved Munden, hvorfra de udgaa, og bredere udåd 

 mod den 1-"' Tentakelrække, Tab. II, Fig. 1. Munden 

 er aflang, foldet og forsynet med 2 dybe Gonidiefurer, 

 som ere temmelig brede udåd. saa de have en næsten tri- 

 angulær Fonn. og i disse triangulære Mundvige sees 2 

 aflange, næsten koniske Knuder (Gonidietuberkler). Tab. II. 

 Fig 1. 



Tentaklerne sidde i 3 Rækker indenfor Kroppens 

 Rand. De ere retraktile, temmelig korte, tykke ved Gran- 

 den, men udløbe konisk mod den tilspidsede Ende. som er 

 perforeret. I den Iste, inderste. Række, er der 16; i den 

 2<Jen er dei' ligeledes 16, men i den 3die, yderste, Række 

 er der 32. idet nemlig 2 staa imellem hver 2 af 2deu 

 Række. Tab.. II. Fig. 1. Alle Tentakler ere omtrent lige 

 store. Saavel Tentaklerne som Mundskiven kan fuldkom- 

 men dækkes af Kropsranden, og naar Dyret paa denne 

 Maade sammentrækker sig. danner det en Halvkugle. 



Kroppens Farve er bleg, rodlig-hvid. men faar paa 

 Grund af det rode Svælg. der skinner igjennem, et rødligt 

 Skjær, imedens dog den øverste Rand er hvid. Tentak- 

 lerne ere rosenrøde, spillende lidt i det Gule. Mund- 

 skiven er mørkere, gulrød, med lysere, gulhvide Straaler. 

 som gaa fra Munden henimod Midten af Skiven. Gonidie- 

 furen er gulhvid. begrændset af en mørkerød Stribe til 

 hver Side; Gonidietuberklerne ere gulhvide. Paa hver Side 

 af Gonidiefuren har Munden 16 stærke Folder, hvoraf 8 

 ere gulhvide og danne en Straalekrands om Munden: de 

 andre 8 have en mørkerød Farve. Disse Folder paa Mund- 

 randen (Læberne) forhenge sig nedover i det mørkerøde, 

 stærkt foldede Svælg. Fodskivens undre Flade havde en 

 mørkerød, lidt i det Brune spillende Farve og var fæstet 

 til Lavabrokker, hvorfra den dog med Lethed løsnedes. 

 Naar Dyret blev sat paa Spiritus, .farvedes denne intenst 

 brunviolet, ligesom selve Dyret antog en stærk violet Farve. 



Indenfor den ectodermale. Beklædning, der som sæd- 

 vanligt bestaar aflange. cilierende Cylinderceller, hvorimel- 

 lem sees en Mængde encellede, flaskeformede Slimceller 

 samt Nematocyster, tindes et bredt, fibrillært Bindevæv med 

 sine Bindevævslegémer, Tab. X. Fig. 1 a. I Midten af 

 dette iagttages, som et Belte, cirkulære Muskler, der danne 

 større eller mindre Bundter, hvori Muskelfibrillerne ere 

 samlede, og sum ligge saaledes indleirede i Bindevævet, at 

 dette omgiver Bundterne som en Skede. Disse Muskel- 

 bundter ligge tildels noget fra hverandre og kunne have 

 indtil et halvt Hundrede Fibriller: tildels beståa de kun af 

 nogle faa Fibriller og kunne ligge tættere sammen. Tab. 

 X, Fig. 1 /': men overalt indtage de Midten af Bindevævs- 

 laget, saa at dette til begge Sider danner brede Længde- 



Deu norske Nordhavsexpedition. IX C. Danielssen: Actinida. 



The oral disc is slightly arcuate, measures about 

 40 mm in breadth and is finely folded. Under slight con- 

 traction the folds are somewhat elevated, and are nar- 

 rowest at the niouth. from whence thev issne, and broadest 

 outwardly, towards the Ist tentacular series (Pl. II. fig. li. 

 The mouth is oblong, folded. and furnished with 2 deep 

 gonidial grooves which are rather broad outwardly. so that 

 thev acquire an almost triangular form. and in these tri- 

 angular gonidial grooves 2 oblong. almost conical knobs 

 (gonidial tubercles) are observed (Pl. IT. fig. 1). 



The tentacles are seated in 3 series inside of the 

 margin of the body; thev are retractile, rather short, thick 

 at the base. lint project conically towards the acuminate 

 extremity. which is perforated. In the innermost, Ist 

 series, there an 16 tentacles; in the 2nd series there are 

 also L6 tentacles; but in the 3rd. outermost series, there 

 are 32 tentacles, as in it 2 tentacles are placed between 

 even two of the 2nd series (Pl. II. fig. 1). All the ten- 

 tacles are about the same size. The tentacles as well as 

 the oral disc. are capable of being completely covered by 

 the margin of the body. and when the animal, in that 

 manner, contracts itself. it forms a hemisphere. 



The colour of the body is pale reddish white, but 

 owing to the red resophagus which shines through. it ac- 

 quires a reddish tinge, whilst the uppermost margin is 

 white. The tentacles have a beautiful rose-red colour, shading 

 a little to yellow. The oral disc is a darker yellowish-red, 

 with lighter coloured yellowish-white ravs issuing from the 

 mouth towards the middle of the disc. The gonidial groove 

 is yellowish-white, bordered by a dark-red stripe on eacli 

 side. The gonidial tubercles are yellowish-white. On each 

 side of the gonidial groove the mouth has 16 strong folds, 

 of which 8 are yellowish white and form a radial wreath 

 round the mouth ; the remaining 8 folds have a dark-red 

 colour. These folds on the oral margin (labiæ) prolong 

 themselves downwards, into the dark-red strongly folded 

 æsophagus. The inferior surface of the pedal disc has a 

 dark-red. shading to brown, colour. and was adherent to 

 fragments of lava from which it was. however. easily 

 detached. When the animal was placed in alcohol, the 

 fluid become coloured a bright brown-violet. while. also, 

 the animal itself acquired a strong violet colour. 



Inside of the ectodermal covering which, as usual. 

 consists of long ciliating cylinder-cells between which a 

 multitude of unicellular, bottle-shaped mucous glands and 

 nematocysts are seen. there is found a broad fibrillar 

 connective-tissue with its connective-tissue corpuscles (Pl. 

 X. fig. 1 a). In the middle of this. circular muscles appear- 

 ing like a belt are observed, which form larger or smaller 

 fasciculi in which the muscle fibrils are collected, and 

 lic embedded in the connective-tissue in such a manner, 

 that it encloses the fasciculi like a sheath. These mus- 

 cular fasciculi are separated. somewhat. from each otber, 

 and niay contain as many as half a hundred fibrils. Thej 

 consist sometimes of only a few fibrils. and may then 

 lie more compactly together (Pl. X. fig. 1 b) but thev. 



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