71 



Skede, der er stærkt inkrusterel og har foroven en skarpt 

 afgrændset, glat Rand. Den øverste Fjerdedel af Kroppen 

 er Qøgen, cylindrisk, glat og har foroven en ty k Rand, som 

 er krenuleret af temmelig fremstaaen.de Ribber, der danne 

 ligesom en spansk Krave omkring Mundskiven, Tab. IV, 

 Fig. 7 h. Der er 24 saadanne Ribber riler Folder, som 

 strække sig omtrent et Par Millimeter nedover Kroppens 

 udvendige, nogne Flade. Det er, om man saa vil. en 

 Parapet. men nogen indenfor værende Fossa existerer ikke. 

 Saavel paa den nogne Dels Overflade som paa den. der 

 bedækkes af Skeden. sees uregelmæssigt stillede Suckers, 

 som ligge indsunkne i Huden. 



Mundskiven er næsten tlad. har 12 brede Folder, der 

 udgaa fra Mundaabningen og strække sig henimod den 

 indre Række Tentakler, hvor de dele sig i to, der hver 

 for sig synes at korrespondere med de ovenfor omtalte 

 Ribber paa Kroppens ovre Rand. Munden er aflang, har 

 to Mundvige, der føre ned til Svælggruberne , og som 

 paa hver Side har 12 temmelig tykke Folder, der danne 

 Læberne. 



Tentaklerne staa i 2 afvexlende Rækker, 12 i hver, 

 og ere retraktile. De i den inderste Række ere længst, 

 men tyndere end de i den ydre Række, der ere tykke og 

 korte. Tab. IV. Fig. 7. Naar Dyret i fuld Vigør har ud- 

 slaaet sine Tentakler, ser det ud, som om der kun er en 

 Række; men ved nærmere Undersøgelse viser det sig, at 

 de tyndere, som afvexle med de tykkere, staa lidt indenfor 

 disse. Den nøgne. cylindriske Del af Kroppen tilligemed 

 Tentaklerne kan trækkes ganske ind i Skeden; men Midt- 

 partiet af Mundskiven synes ikke at kunne inddrages eller 

 dækkes af Kroppens øverste Rand, da Mundaabningen med 

 de nærmest omgivende Dele altid ligner blottet. 



Farven. Skeden er inkrusteret af lysegraat Ler, spil- 

 lende lidt i det Brune (plastisk Biloculinlen. som paa dens 

 nederste Del, der omgiver Fodskivens Rand, er grovere. 

 Kroppens nøgne Del er lysviolet, imedens dens øverste, 

 ribbede Rand er skidden gulhvid. De indre Tentakler ere 

 næsten brun violette; de i ydre Rækken lys violette med 

 en hvid Ring omkring Grunddelen og lysere Spids. Mund- 

 skiven bleg violet med skidden gulhvide Folder. Dyret 

 sidder paa smaa, flade, kompakte Lerklumper. 



Den Del af Kroppen, som er bedækket af Skeden, 

 er i histiologisk Henseende noget forskjellig fra den nøgne 

 Del. Skeden bestaar af to Lag; et ydre, der danner en 

 seig Slimmenibran, hvori er indleiret fint Ler, Sand og 

 Skaller af Foraminiferer, alt fremmede Gjenstande, som til- 

 høre Bunden, paa hvilket Dyret lever, og et indre Lag, der 

 bestaar af en skarpt begrændset, fibrillær Membran (Guti- 

 cula), som skilles temmelig fra den ydre Slimmenibran, men 

 er fast bunden til det indenfor værende Ectoderm. Naar 

 Dyret berøves en større eller mindre Del af det 

 ydre Lag, reproduceres det paa den Maade, at der fra 



pedal disc. is elad with a membranous sheath strongly 

 encrusted, and having at its top a sharply defined, smooth 

 margin. The iippermost fourth part of the body is bare, 

 cylindric, smooth. and at the top has a thick margin whieh 

 is crenulated by rather projectant ribs, whieh form, as it 

 were, a frilled collar round the oral disc iPl. IV, fig. 7 6). 

 There are 21 of these ribs or folds, whieh extend them- 

 selves about a couple of millimetres down the exterior, bare 

 surface of the body. It is, as we nia v say, a parapet but 

 without any fosse inside it. Both upon the exterior sur- 

 face of the bare part of the body as well as upon the 

 part clothed with the sheath. irregularlv placed suckers 

 are seen lying embedded in the integument. 



The oral dise is almost flat, has 12 broad folds whieh 

 issue from the oral aperture and extend theniselves towards 

 the inner series of tentacles, where they split theniselves 

 into two parts, each of whieh appears to correspond with 

 the ribs on the lipper margin of the body above nien- 

 tioned. The moutli is oblong, has two oral angles leading 

 down to the gonidial-grooves, and whieh have on each side 

 12 rather thick folds that form the labiæ. 



The tentacles are situated in 2 alternating series. 12 

 in each, and are retractile. Those in the innermost series 

 are longest, but thinner than those in the outer series, 

 whieh are thick and short (Pl. IV. fig. 7). Wlien the 

 animal is in full vigour and has outstretched its tentacles, 

 it appears as if there was only one series, but upon closer 

 investigation it is seen that the thinner ones, whieh alter- 

 nate with the thicker ones. are situated a little to the 

 inside of the latter. The bare cylindric part of the body 

 as well as also the tentacles, can be quite withdrawn into 

 the sheath; but the mesial part of the oral disc appears 

 not to be capable of being retracted or being covered by 

 the uppermost margin of the body, as the oral aper- 

 ture with the adjacent surrounding parts always remains 

 exposed. 



The colowr. The sheath is encrusted with light grey 

 elav, shading a little to brown (plastic biloculina-clay) whieh 

 is coarsest upon the lowest part surrounding the margin 

 of the pedal disc. The bare part of the body is light- 

 violet, whilst its uppermost ribbed margin is dirty yel- 

 lowish-white. The inner tentacles are almost brown- 

 violet; those in the outer series, light-violet with a white 

 annulus round the base and lighter coloured points. The 

 oral disc pale violet, with dirty yellowish-white folds. The 

 animal is seated on small, flat, compact lumps of elav. 



That part of the body whieh is clothed by the sheath 

 is, in histological respects, somewhat different from the bare 

 portion. The sheath eonsists of two layers, an outer one that 

 forms a viscid mucous membrane in whieh fine clay, sand. 

 and shells of foraminifara He embedded, all of them foreign 

 bodies whieh belong to the sea-bottoni upon whieh the 

 animal exists ; and an inner laver that eonsists of a sharply 

 defined, fibrillar membrane (cuticulum) whieh is well 

 separated from the outer mucous membrane, but firmly 

 adherent to the ectoderm lying inside. When the animal 

 is deprived of a greater or smaller portion of the outer 



