Folder, der straale ud fra Centrum mod Peripherien og 

 antyde Insertioneme at' Septa. 



Kroppen danner næsten en omvendt Kegle, er 22""" 

 boi. 15""" bred opimod Mundskiven, men kun 8 — 10""" bred 

 strax ovenfor Fodskiven. Tab. I, Fig. 2; Tab. VII, Fig. 11. 

 Den har stærke og temmelig brede Tverfolder og en dyb 

 Indsnøring strax ovenfor Fodskiven. Tab. I. Fig. 2: Tab. 

 VII, Fig. 11. Det er denne Kroppens Form, der i Foren- 

 ing med Fodskiven giver hele Dyret nogen Lighed med 

 en Urne. Kroppens udvendige Flade har et rut CTdseende, 

 er tæt besat med yderst smaa Vorter, som har en liden, 

 rund Fordybning i Midten, Tab. VII. Fig. 11 b (Suckers), 

 hvortil hist og her er fæstet fremmede Legemer; dens 

 øverste Rand er noget ujævn. 



Mundskiven er omtrent 20""" bred, kun lidet hvælvet 

 og forsynet med fine Folder, der udgaa vifteformigt fra den 

 noget aflange Mund. Tab. VII. Fig. 11. Denne har tykke. 

 foldede Læber og 2 temmelig brede Gonidiegruber. 



Tentaklerne ere retraktile. indtage Mundskivens Peri- 

 pheri og danne 2 Rækker, 36' i hver. Tab. VII. Fig. 11. 

 I den yderste Række ere de kortere og tykkere end i den 

 indre Række, hvor de ere næsten en halv Gang saa lange 

 og temmelig smale. Xaar Dyret trækker sig sammen, ned- 

 sænkes Mundskiven. og Kroppens øverste Haml trækker sig 

 over den. 



Farven. Fodskiven er næsten livid med et svagt Ro- 

 senskjær. Kroppen er bleg rosenrød, noget mørkere i de 

 Furer, som ere imellera Folderne. Mundskiven er smuk 

 kastaniebrun med en mørkere Ring omkring Munden. Ten- 

 taklerne i den yderste Række have Kroppens Farve, ime- 

 dens de i den indre Række have en noget intensere brun 

 Farve end Mundskiven. Tab. I. Fig. 2. 



Dyrets ydre Flade er beklædt med et Epithel, be- 

 staaende at' lange, cilierende Gylinderceller, Tab. IX, Fig. 

 8 a, hvorimellem sees en Mængde, dels Nematocyster, dels 

 encellede Slimkjertler; Neldeorganerne ere dog i størst 

 Mængde paa Tentaklerne. Indenfor Ectodermet er et ikke 

 meget bredt, fibrillært Bindevæv, Tab. IX, Fig. 8 i, i hvis 

 Midte er et bredt Belte af cirkulære Muskelfibre, der ligge 

 i tykkere eller tyndere Bundter, Tab. IX. Fig. 8 c. Til 

 begge Sider af de cirkulære Muskler er et smalt Baand af 

 Bindevæv, hvori sees Bindevævslegemer, og som udåd 

 grændse til Ectodermet og indad til Endodermet, Tab. IX, 

 Fig. 8 b. Dette er dannet af et Lag lange Cylinderceller, 

 forsynede med en Pidske, Tab. IX, Fig. 8 il', og den be- 

 klæder hele Dyrets indre Flade. Mavehulheden, den ydre 

 Flade afSvælgrøret og Skillevæggene ; ogsaa imellem Endo- 

 dermcellerne iagttages baade Nematocyster og encellede 

 Slimkiertler. 



Fig. 11 a). Its under surface lias tine folds which radiate 

 from the centre towards the periphery, and indicate the 

 insertions of septa. 



The body forms an almost inverted cone, is 22""" in 

 height, and 15""" in breadth up towards the oral disc, hut 

 ; s (11 || v s — Kl""» in breadth immediately above the pedal disc 

 (Pl. I. fig. 2. Pl. VII. fig. 11). It has strong, and rather 

 broad, transversal folds, aud a deep constriction immediately 

 above the pedal disc (Pl. I. fig. 2. Pl. VII, fig. 11). It 

 is tliis form of the body which, in conjunction with the 

 pedal disc. gives to the complete animal somewhat the 

 resemblance of an urn. The external surface of the body 

 lias a rough appearance, and is closely beset with extremely 

 minute mammillæ having a small, round depression in the 

 middle (Pl. VII, fig. 11 ?*) (suckers) to which foreign 

 bodies are here and there attached. Tts uppermost mar- 

 gin is somewhat uneven. 



The oral disc is about 20""" in breadth and only 

 slightly arcuate; it is furnished with fine folds which issne, 

 in flabelliform, from the somewhat oblong mouth (Pl. VII. 

 fig. 1 1 1. Tliis has thick, folded labiæ, and two rather broad 

 gonidial grooves. 



The tentacles are retractile; they occupy the periphery 

 of the oral disc. and form two series. 36 tentacl -s in eaeh 

 i Pl. VII. fig. 11). In the outermost series they are shorter 

 and thicker tlian in the inner series, where they are almost 

 half again as long. and rather narrow. When the animal 

 contracts itself the oral disc becomes depressed, and the 

 uppermost margin of the body draws itself over it. 



Tlie colour. The oral disc is almost white, with a 

 faint rosy tinge. The body is pale rose-red, which becomes 

 somewhat darker in the grooves that appear between the 

 folds. The oral disc is a beautiful chestnut-brown, with a 

 darker annulus round the mouth. The tentacles of the 

 outermost series have the colour of the body. whilst those 

 of the inner series have a somewhat more intense brown 

 colour than that of the oral disc (Pl. I, fig. 2). 



The exterior surface of the animal is clad with an 

 epithelium eonsisting of long ciliating cylinder-cells (Pl. IX. 

 fig. 8 a) between which there are seen a multitude. partlv 

 of nematocysts, and partly of unicelmlar mucous glands. 

 The nematocysts are. however, found in greatest abundance 

 on the tentacles. Inside of the ectoderm there is a not very 

 broad fibrillar connective-tissue (Pl. IX. fig. 8 b), in whose 



middle there is a broad belt of circular muscle-fibres, pli d 



in thicker or thinner fasciculi (Pl. IX, fig. 8 c). Onboth 

 sides of the circular muscles there is a narrow ribbon of 

 connective-tissue, in which connective-tissue corpuscles are 

 seen, and which. externally, borders the ectoderm, and. in- 

 ternallv. borders the endoderm I Pl. IX, fig. 8 b). This 

 endoderm is formed of a laver of long cylinder-cells fur- 

 nished with a flagellum (Pl. IX. fig. 8 cl'), and it clothes 

 the entire inner surface of the animal, the gastric cavity, 

 the external surface of the oesophagus and the diyisional- 

 walls. Between the cells of the endoderm. there are also, 

 observed both nematocysts and unicellular mucous glands. 



Den norske Nordhavsex] D. ( Danielssen: Actinida. 



