40 



aftage betydeligt mod Fodskiven, paa hvis Rund de dog 

 endnu tildels kunne iagttages. Knuderne ere i sin store 

 Almindelighed ganske glatte med hvælvet Overflade: kun 

 paa enkelte sees en Fordybning, uden dog at være gjen- 

 nemboret. Ved Siden af Knuderne sees hist og her enkelt- 

 staaende Sugevprter, der under Dyrets Kontraktion saagodt- 

 som ganske skjules af de overhvælvende Knuder. Kroppens 

 øverste Rand har et foldet Udseende som Folge af de paa 

 den siddende Knuder on er lidt udkrænget. 



Mundskiven er kun lidet hvælvet. foldet, og i dens 

 Centrum sidder den aflange Mund med tykke, foldede 

 Læber og to biede Gonidiegruber. I Mundaabningen er 

 en Del Acontier udkastede. I Mundskivens Peripheri ci- 

 der 4 Rækker Tentakler, hvoraf den yderste Række har 

 omkring 70. som ere baade kortere og tyndere end de i 

 den inderste Række og staa lige indenfor Kropsranden. 

 Tentaklerne ere i det Hele tåget tykke, konisk tilspidsede, 

 ikke meget retraktile. og have paa deres Ende en rund 

 Aabning, omgiven af en Sphincter. Naar Dyret er i fald 

 Vigør og Tentaklerne udspændte, ser man ofte en hu Vand- 

 straale sproite nil igjennem Aabningen, og da der er 

 heiiimod 300 Tentakler, er det et noksaa smukt Vandspring, 

 soiii derved fremkommer. Irriteres ganske svagt Mund- 

 aabningenj sættes Vandspringet let i Spil. I Dyrets 

 døende Tilstand udstødes af Tentakelaabningerne lange, 

 fine Slimtraade. 



Farven. Kroppen er hvid, perlemorglindsende, spil- 

 lende svagt dels i det Rode. dels i det Blaalige. Tentak- 

 lerne ere havannalirune. Mundskiven har Kroppens Farve, 

 kanske lidt mørkere, og fra Munden udgaa fine. brune 

 Striber heiiimod Tentaklerne. Mundlæberne og Svælget 

 ere mørk kastaniebrune. 



Indenfor det sædvanlige Ectoderm, Tab. X. Fig. 8 a, 

 9 a, er paa Kroppen et meget bredt, fibrillært Bindevævs- 

 lag, hvori sees en Mængde yderst smaa Bindevævslegemer 

 og yderst fine Saftkanaler, Tab. X, Fig. 8 b, 9 b. Lige 

 ved den indre Flade sees temmelig stærkt udviklede, endo- 

 dermale Cirkulærmuskler, imedens hele den øvrige Del af 

 Bindevævet er uden Muskler. Disse cirkulære Muskler. 

 Tab. X. Fig. 'J r. danne temmelig regelmæssige Folder, 

 der fremtræde paa Længdesnit som smukke Guirlander. 

 Tab. X. Fig. S c. Paa Tversnit ligge de bølgeformigt i 

 Bindevævet, Tab. X. Fig. i» c. 



Der er 6 principale Par Septa, som ere fuldstændige, 

 forsaavidt de læste sig paa Svælgrøret. Af disse Septapar 

 er der to Par udprægede Retningssepta, paa hvis indre 

 Flader — de der vende mod hinanden — sees transverselle 



Muskler, som danne en meget tynd, foldet Membran, 

 imedens deres ydre Flade er beklædt med buskformede, 

 longitudinelle Muskler: paa de øvrige 4 Par Septa ere 



are most protuberant upon the uppermost part of the 

 body. but are largest at the middle. while tbey diniinish 

 considerably towards the pedal disc on whose margin. 

 however, tbey can still, to some extent. be observed. 

 The nodules are. for the most part. quite smooth with 

 arcuate surface, and only in a. few of theni is a depression 

 visible, without, however, being perforated. Alongside the 

 nodules tbere are here and there seen suckers, which, 

 during the gontractions of the animal, are almost entirely 

 concealed by the overwhelming mass of nodules. The up- 

 permost margin of the body has a folded appearance owing 

 to the nodules seated on it. and is slightly evolved. 



The oral disc is only slightly arcuate. folded. and in 

 its centre the oblong mouth is placed; this has thick folded 

 labiæ and two broad gonidial grooves. In the oral aperture 

 a number of aeontia are thrown out. lu the periphery 

 of the oral disc there are 4 series of tentacles, of which 

 the outermost series contains about 7<>. which are botb 

 shorter and thinner than those of the innermosf series, 

 and are placed just inside of the margin of the body. 

 The tentacles are. upon the whole, thick. aud are conically 

 acuminated and not very retractile; tbey have on their 

 extremities a mund orifice surrounded by a sphincter. 

 When the animal is in tull vigour and the tentacles ex- 

 tended. a fine water-jet is frequently seen to be squirted 

 out througb the orifice, and as there are about 300 ten- 

 tacles. there is thus produced quite a beautiful fountain. 

 When tin- oral aperture is gently irritated the fountain is 

 easily set a-going. When the animal is in moribund con» 

 dition. long fine mucous threads are projected from the 

 tentacular orifices. 



The colour.. The body is white with a mother-of- 

 pearl lustre, sbading faintly. partly to red partly to bluish. 

 The tentacles are Havana-brown. The oral disc has the 

 same colour as the body. perhaps slightly (larker: and 

 from the mouth. fine brown stripes issne towards the 

 tentacles. The oral labiæ and the æsophagus are dark 

 chestnut-brown. 



Inside of the usual ectoderm i Pl. X. fig. 8 fl. 9 a 

 there is. upon the body. a very broad. fibrillar laver of 

 connective-tissue. in which a multitude of extivnicly small 

 coniiective-tissue corpuscles are seen. aud extremely sien der 

 nutritory ducts. Just at the inner surface. rather strongly 

 developed, endodermal, circular muscles are observed, while 

 the entirc remaining part of the connective-tissue is devoid 

 of muscles. These circular muscles (Pl. X. fig. 9 c) form 

 rather regular folds, which appear, in longitudinal sections. 

 as beautiful garlands (Pl. X. fig. 8 c). In transversal 

 sections tbey appear in wavy form. lying in the connective- 

 tissue (Pl. X. fig. 9 c). 



Tbere are 6 principal pairs of septa. which are perfect 

 in so far that they attach themselyes to the æsophagus. 

 Of these pairs of septa, there are two pairs of distinguished 

 directive septa upon whose inner surfaces. which face to- 

 wards eaeh other. transversal muscles are seen forming a 

 very thin folded membrane, whilst the outer surface is 

 clad with fruticous longitudinal muscles; on the remaining 



