102 



Elementer i samme; heller ikke var det muligt at finde 

 nogen organisk Forbindelse imellem dette Overtræk og den 

 indenfor liggende Hiu!. hvortil det syntes at være fæstel 

 dels ved sin Klæbrighed og dels ved de paa Kroppens 

 Overflade værende Sugevorter. Men at dette Overtræk 

 bestaar af en sammenhængende Slimmembran, sees bedst 

 derved, at saasnart Dyret var kommet i Alkohol, stødtes 

 denne Overhud af overalt, og ved da at undersoge den. 

 viste den sig som en grøn. tynd. gjennemsigtig Membran, 

 hvori var leiret de omtalte fremmede Legemer, samt en 

 Mængde Nematocyster og en Del Cylinderceller, der vare 

 løsrevne fra Ectodermet og fulgte med det membranøsé 

 Overtræk, Tab. XVI, Fig. 10. Nematocysterne slynge sine 

 Spiraltraade aabenbart ud igjennem den tynde Membran, 

 som desuden paa enkelte Steder synes at have runde Aab- 

 ninger, hvorigjennem Sugevorterne kunne strækfce sig w]. 



Hudens ydre Flade er dækket af et Ectoderm, be- 

 staaende af Cylinderceller med deres Kjerne og Kjerne- 

 legeme og fbrsynede med Cilier. Saavidt jeg kunde iagt- 

 tage. var dette Tilfældet overalt, baade der hvor Over- 

 trækket fandtes, og hvor Huden var uden saadant, Tab. 

 XVI, Fig. (i «. Imellem Cylindercellerne tindes encellede 

 Slimkjertler, som dog ikke synes at være i nogen særdeles 

 stor Mængde tilstede, især gjælder dette Capitulum og 

 Physa. samt Nematocyster, der optræde i stor Mængde 

 paa Tentaklerne. 



Indenfor Ectodermet er et temmelig bredt, fibrillært 

 Bindevævslag, som er rigl paa Bindevævslegemer, dels med 

 enkelte, dels med tiere Udløbere, samt fine Ernærings- 

 kanaler, med hvilke de nys nævnte Udløbere korrespondere, 

 Tab. XVI. Fig. 6 b. Disse Hue Saftkanaler ere altid for- 

 synede med et Epithel, hvis aflange Celler saagodtsom 

 ganske udfylde Lumenet. Henimod den indre Flade af 

 Bindevævslaget iagttages et bredt Belte af Cirkulærmuskler, 

 Tab. XVI, Fig. li c, der danne temmelig stærke Bundter, 

 som paa enkelte Steder synes at rage ind paa den indre 

 Flade. der er beklædt med Endothelet. Dette bestaar 

 af temmelig lange Cylinderceller, forsynede med Kjerne. 

 Kjernelegeme og Cilier. samt et Endothel, som beklæder hele 

 G-astrovascularhulheden og de i denne liggende Organer. 



Fra den indre Væg af det omtalte Bindevæv udspringe 

 8 Septa. der i Bunden af Gastralhulheden ere temmelig 

 smale, men blive jo Lengere de komme op paa Kroppen 

 bredere og bredere, indtil de fæste sig paa Svælgrøret. 

 Disse 8 Septa. staa saa langt fra hverandre, at de nok 

 kunne betragtes som isolerede og ikke parrede. Imidlertid 

 ere de 4 af dem stillede saaledes. at de muligens kunne 

 ansees for 2 Par. som baade ifølge deres Stilling og Muskel- 

 anord ning maa blive Retningssepta, Tab. XVI, Fig. 7 a. 

 De ere fæstede til den Del af Svælgrøret, der svarer til 

 Mundvigene, og de to Svælggruber, som jeg har Grund til 

 at antage ere tilstede. Da jeg ikke havde mere end 1 

 Exemplar til Undersøgelse, har jeg, for ikke ganske at 

 odelægge dette, gjort Tversnit kun igjennem den halve Del 



organic elements being seen in these; neither was it pos- 

 sible to detect anv organic corinection between this covering 

 and the integument situated withjra, to which it appeared 

 to be attached, partly by its stickiness. and partly by means 

 of the suckers on the outer surface of the body. But 

 that tiiis covering consists of a continuous mucous mem- 

 brane is best observed from this fact. that as soon as the 

 animal was placed in alcohol the covering was everywhere 

 thrown off, and. upon examination then, appeared to be a 

 green, thin. transparent membrane, in which the foreign 

 bodies mentioned were embedded, also a multitude of 

 nematocysts and some cylinder-cells which were tom away 

 from the ectoderm and accompanied the membranous 

 covering (Pl. XVI. fig. 10). The nematocysts evidently 

 twine their spiral threads out through the thin mem- 

 brane. which appeais in a few places. also. to have round 

 apertures through which the suckers may stretch them- 

 selves out. 



The outer surface oi the integument is covered by 

 an ectoderm. consisting of cylinder-cells with their nucleus 

 and nucleus-corpuscle and furnished with eiliæ. So far as 

 I could observe this was everywhere the case. both where 

 the covering was present and also where it was absent 

 (Pl. XVI, fi^. ti a). Between the cylinder-cells unicellular 

 mucous glands were found. which did not. however, appear 

 to be present in anv particularly great abundance, espec- 

 ially on the capitulum and physa, also nematocysts, which 

 appear in great abundance on the tentacles. 



Inside of the ectoderm there i*- a rather broad, 

 fibrillous laver of connective-tissue , partly with a few. 

 partly with inany prolongations, also fine nutritory ducts 

 with which the prolongations just mentioned correspond 

 (Pl. XVI. ti 1 .:, ti /' /. These tine nutritory ducts are always 

 supplied with an epithelium whose oblong cells almost 

 quite fill the channel. Towards the inner surface of the 

 layer of connective-tisse, a broad helt ol' circular muscles 

 is observed (Pl. XVI. fig. (i c). which form pretty strong 

 bundles that in some places appear to reach inwards to 

 the inner surface. which is clad with the endotbelium. 

 This eonsists of rather long cylinder-cells. furnished with 

 nucleus. nucleus-corpuscle and eiliæ, also an endothelium 

 that clothes the entire gastro-vascular cavity and the organs 

 situated in it 



From the inner wall of the connective-tissue spoken 

 of, 8 septa issiie. which. in the bottom of the gastral 

 cavity. are rather narrow. but become broader and broader 

 the farther up the body they extend. until they attach 

 themselves to the gullet-tube. These 8 septa stand so far 

 apart, that they may almost be regarded as isolated and 

 not in pairs However. 4 of them are placed in such a 

 manner, that they may possibly be regarded as 2 pairs, 

 which, both from their position and muscular arrangement, 

 must be directive septa (Pl. XVI. fig. 7 a). They are 

 secured to the part of the gullet-tube that corresponds to 

 the oral angles and tin- two gullet-grooves which I have 

 reason to believe are present. As I bad not more than 

 a single speeimen for my investigations. I have. in order 



