83 



Don nøgne Del af Kolumnen tilligemed Mundskiven 

 og Tentaklerne kan indtrækkes i Legemet, og naar saa 

 den øverste Del af Kroppen lukkker sig, danne de 6 

 Ribber med deres nøgne Mellemrum en Glorie med en fin 

 Aabning i Midten, og Dyret faar derved saa megen ydre 

 Lighed med enZoanthide, at jeg ved den forst e, overfladiske 

 Betragtning antog det derfor. Farven: Det inkrusterede 

 Overtræk med Ribberne er brunt med mørke, næsten 

 sorte Punkter. Indenfor Overtrækket er Huden hvid, spil- 

 lende lidt i det Rosenrøde. Længdelinierne ere blegrøde. 

 Den nogne Del med Ribbernes Mellemrum er bleg rosen- 

 rød. Mundskiven er næsten hvid; omkring Munden er 

 en rod King. hvorfra udgaa 12 fine, rosenrøde Striber 

 henimod Skivens Rand. Tentaklerne ere intens laxerode. 

 Tab. VI. Fig. 5. 



Ogsaa af dette interessante Dyr fandt jeg destoværre 

 kun 1 Exemplar paa 457 Favnes Dyb — i den kolde Area 

 — hvilket blev observeret og tegnet levende. Men ogsaa 

 dette Unieum har jeg fundet nødvendigt at ofre paa 

 Videnskabens Alter for at faa Kundskab om dets indre 

 Bygning og derefter at bestemme dets systematiske Plads. 

 Jeg har skaaret det tversover Midten af Kroppens nogne 

 Del og opbevaret Størstedelen heraf med Mundskive og 

 Tentakler i Alkohol ; af hele den øvrige Kropsdel har jeg 

 gjort Snitpræparater, som ogsaa opbevares. 



Anatomisk -histologisk Unclersøgelse. Paa Tversnit- 

 tene af Kroppen sees det ydre. inkrusterede Overtræk 

 at beståa af en tyk Slimmembran. hvori de grove Sand- 

 korn ('fornemmelig Kvarts) ere indleirede. Tal). XXIII, 

 Fig. b' a. Slimmembranen er ganske løst fæstet til den 

 indenfor værende Hud. uden nogen organisk Forbindelse. 

 Indenfor det skedeformede Overtræk er et bredt Epithel- 

 lag (Ectoderin). der dannes af meget hoie, smale Cylinder- 

 celler med deres Kjerne og Kjernelegeme, Tab. XXIII, 

 Fig. 6 b, og imellem hvilke iagttages en stor Mængde 

 Nematocyster og Slimkjertler. Xematocysterne. der ere 

 de almindelige med Spiraltraad, rage tildels ind i Slim- 

 membranen, saa at, naar denne fjernes, folge mange med 

 den, Tab. XXIII, Fig. 6 c. Slimkjertlerne ere kolbefor- 

 mede. encellede, ligge tildels i Grupper og ere snart fyldte 

 med en kornet Masse, saa at Kjernen skjules, snart ere 

 de tomme og se ud som A T acuoler, Tab. XXIII. Fisi. 6 cl. 



Indenfor Ectodermet er et bredt, fibrillært Binde- 

 vævslag, forsynet med Bindevævslegemer med flere Ud- 

 løbere samt Ernæringskanaler, 'fyldte med Epithel, Tab. 

 XXIII, Fig. 6 e, og omtrent i Midten af dette Bindevæv 

 er et temmelig bredt Belte af stærke Cirkulærmuskler. der 

 synes at ligge i Bundter. Tab. XXIII. Fig. 6/. Paa den 

 indre Flade af Bidevævslaget er et Muskellag, bestaaende 

 af Tver- og Længdemuskler, hvoraf de sidste ere især freni- 

 trædende, Tab. XXIII, Fig. 6 g, og som er beklædt med 

 et temmelig bredt Endothel. 



The bare part of the column. as well as the oral 

 (lise and tentacles. may be withdrawn into the body; and 

 when the uppermost part of the body then closes itself, 

 the 6 ribs with their bare intermediate spaces. form a halo 

 having a minute aperture in the middle; in this way the 

 animal acquires so much the external appearance of a 

 Zoanthid. that on the preliminary, summary investigation 

 I took it to be one. The colour. The encrusted covering 

 and the ribs are brown, with dark. ahnost black points. 

 Inside the covering the integment is white with a slight 

 rose-red play of colour. The longitudinal lines are pale- 

 red. The bare part and the spaces between the ribs are 

 pale rose-red. The oral disc is ahnost white; round the 

 mouth there is a red annulus from which 12 fine rose-red 

 stripes issue towards the margin of the disc. The ten- 

 tacles are bright salmon-red (Pl. VI, fig. 5). 



Also of this intei-esting animal I found, unfortunately, 

 only one specimen, at a depth of 457 fathoms — in the cold 

 area — which was observed and drawn in the live state. 

 But this unieum, also, I have found it necessary to offer as 

 a sacrifice on the altar of science, in order to obtain a 

 knowledge of its internal structure and determine its 

 systematic position. I have transsected it at the middle 

 of the bare part of the body, and preserved the greater 

 part of this with the oral disc and tentacles in alcohol; 

 of the entire remaining part of the body I have made 

 sectional preparations, which have also been preserved. 



Anatomo-histological examination. In the transversal 

 sections of the body, the outer encrusted covering is seen 

 to consist of a thick mucous membrane in which the coarse 

 grains of sand (quartz principally) are entrenched (Pl. XXIII, 

 fig. 6 a). The mucous membrane is quite loosely adherent 

 to the integument lying inside, and has no organic connec- 

 tion with it. Inside the vaginate covering there is a broad 

 laver of epithelium (ectoderin), formed of very high, narrow 

 cylinder-cells with their nuclei and nucleus-corpuscles (Pl. 

 XXIII, fig. 6 b), and between these a great multitude of 

 nematocysts and mucous glands are observed. The nema- 

 tocysts - which are the usual ones with spiral filaments 

 — extend partially into the mucous membrane, so that, 

 when it is removed, many of them follow along with it 

 (Pl. XXIII. fig. 6 e). The mucous glands are claviform, 

 unicellular, situated partly in gi - oups, and are often filled 

 with a granular substance, so that the nucleus is con- 

 cealed; often they are empty and appear like vacuoli (Pl. 

 XXIII, fig. (i cl). 



Inside the ectoderm there is a broad, fibrillar con- 

 nective-tissue laver, -furnished with connective-tissue cor- 

 puscles having several prolongations, also nutritory ducts 

 filled with epithelium (Pl. XXIII. fig. 6 e), and at about 

 the middle of this connective-tissue there is a pretty broad 

 belt of strong circular muscles, which appear to lie in 

 bundles (Pl. XXIII, fig. 6 /). On the inner surface of 

 the laver of connective-tissue there is a musculous layer, 

 consisting of transversal and longitudinal muscles, the last- 

 named being especially prominent (Pl. XXIII, fig. 6 g). 

 and which is clad with a pretty broad endothelium. 



