58 



en afrundet, skarpt begrændset Rand, Tab. III, Fig. 8 a; 

 Tab. XIII, Fig. 1 a; den øverste Fjerdedel er nogen. glat, 

 forsynet med fine Længdestriber, der antyde Septainser- 

 tionerne, og er saa gjennemsigtig, at Mesenterialfilamen- 

 terne kunne sees, Tab. III, Fig. 8 b ; Tab. XIII, Fig. 1 b. 

 Imellem Linierne sees yderst smaa, runde Vorter, som 

 synes at staa i et Par Tverrækker. Disse Vorter, der især 

 blive tydelige under Kontraktionen, men forresten kan sees 

 under Lonpen, er paa Midten forsynet med en Grube og 

 maa betragtes som Sugevorter, Tab. XII, Fig. 14. 



Mundskiven er næsten plan, strækker sig noget udover 

 Kolumnen og har en Mængde fine Folder, der straale ud 

 fra Munden mod Peripherien. Munden er atlang med tykke, 

 foldede Læber, Tab. XIII, Fig. 1. Tentaklerne ere lange, 

 slanke og staa i 4 Rækker. I den yderste eller 4de Række 

 staa de lige i Kroppens overste Rand, ere glasklare, traad- 

 formige og omtrent 48 i Antal. Den 3dje Række har det 

 samme Antal; de ere noget tykkere og sidde afvexlende 

 med de foregaaende; ogsaa i den 2den Række er der 48, 

 som ere baade længere og tykkere end de i 3<lie Række; 

 men i den Iste eller inderste Række er der 24; disse ere 

 de længste og tykkeste, Tal). XIII, Fig. 1. Hele den 

 overste, nøgne Del af Kolumnen med Mundskiven og Ten- 

 takler kan fuldstændig drages ind i den inkrusterede. 

 SkeUe og ganske skjules af denne. Halvt indtrukken skjules 

 Tentaklerne, Mundskiven og den nogne Del af Kolumnen, og 

 der dannes da en Halvkugle med udprægede Folder. Tab. 

 XII, Fig. 13 a. Er den nogne Del helt indtrukken, sees 

 kun Skeden som en opretstaaende Soile. Fjernes den 

 inkrusterede Skede fra den indenfor værende Hud. hvortil 

 den forøvrigt er meget fast adhæreret, saa frembyder Krop- 

 pens Overflade under Loupen et vortet Udseende. Vorterne 

 staa her i temmelig regelmæssige Tverrækker, noget langt 

 fra hverandre, have paa Midten en Grube og ere fuldkom- 

 men lig dem, som tindes paa den nogne Del. Tab. XII, 

 Fie. 14. 



Farven. Den inkrusterede Skede er graabrun ; den 

 nøgne Del af Kroppen er næsten hvid og saa gjennemsig- 

 tig, at de temmelig stærkt gulfarvede Mesenterialfilamenter 

 sees. Skiven er fin rosenrod med en smal, gulhvid Ring 

 omkring Munden. Svælget er gulhvidt. Tentaklerne ere 

 i den Iste, inderste, Række, stærkt laxerode; i den 2den 

 Række er Farven mindre intens ; i den 3dje Række er den 

 fin rosenrod, og i den 4de, yderste, Række ere Tentaklerne 

 saagodtsom farveløse, men have en svag, violet Ring omkring 

 deres Grunddel, Tab. III, Fig. 8. 



Paa et Tversnit af Kroppens inkrusterede Del sees 

 det ydre Lag at være dannet af en strukturløs, bred Mem- 

 bran, hvori er indleiret fremmede Legemer, saasom Ler. 



a sheath, which at its top has a rounded, sharply defined 

 margin (Pl. III, fig. 8 a; Pl. XIII, fig. 1 a). The upper- 

 most fourth part is bare and smooth, and is furnished with 

 fine longitudinal stripes which indicate the insertions of 

 septa, and it is so transparent that the mesenterial filaments 

 can be seeu (Pl. III, fig. Sb: Pl. XIII, fig. 1 b). Between 

 the lines, extremelv small, round nodules are observed, 

 which appear to be placed in a couple of transversal series. 

 These nodules become epecially distinct during contraetions 

 of the animal, but at other times can only be observed 

 with the assistance of a magnifier; they are furnished in 

 their middle with a cavity and must be considered as 

 suckers (Pl. XII, fig. 14). 



The oral dise is almost plane and extends itself some- 

 what out beyond tin- column, and it has a multitude of fine 

 folds radiating from the mouth towards the periphery. 

 The mouth is oblong, with thick folded labiæ (Pl. XIII, 

 fig. 1). The tentacles are long, attennated, and placed in 

 4 series. In the outermost or 4th series they are situated 

 exactly in the uppermost margin of the body, are trans- 

 lucent, filamentous, and about 48 in number. The 3rd 

 series of tentacles has the same number; they are some- 

 what thicker, and are placed alternating with those of the 

 preceding series. In the 2nd series of tentacles there are 

 also 48, which are both longer and thicker than those of 

 tlie 3rd series; but in the Ist or innermost series there 

 are 24; these are the longest and thickest iPl. XIII, 

 fig. li. The entire uppermost. bare part of the column, 

 with the oral disc and tentacles, can be entirely with- 

 drawn into the encrusted sheath and be completely con- 

 cealed by it. When only half retracted, the tentacles. oral 

 disc and bare part of the column are hidden, and there 

 is then formed a hemisphere with distinguished folds (Pl. 

 XII, fig. 13 a). When the bare part is entirely retracted 

 the sheath alone is seen. appearing like a vertieal pillar. 

 When the encrusted sheath is removed from the integu- 

 nient lying inside of it, to which it is, however, very 

 firmly adherent, the external surface of the body then pre- 

 sents, under the magnifier, a nodulous appearance. The 

 nodules are here placed in rather regular transversal 

 series, somewhat apart from each other, and have a cavity 

 in the middle, and are exactly similar to those which are 

 observed on the bare part (Pl. XII, fig. 14). 



TJie colour. The encrusted sheath is grey-brown ; the 

 bare part of the body is almost white, and so transparent 

 that the rather strongly yellow-coloured mesenterial filaments 

 may be seen. The oral disc is fine rose-red with a narrow 

 yellowish-white annulus round the mouth. The æsophagus 

 is yellowish-white. The tentacles are in the Ist, inner- 

 most series, strong salmon-red colour; in the 2nd series 

 the colour is less intense, in the 3rd series it is fine rose- 

 red, and in the 4th, outermost series, the tentacles are 

 almost colourless, but have a faint violet-coloured annulus 

 round their base (Pl. III, fig. 8). 



In a transversal section of the encrusted part of the 

 body, the outer layer is seen to he formed of a structure- 

 less broad membrane in which foreign bodies are embedded, 



