149 



Ved Tversnit sees paa Spiserørets og Tarmkanalens 

 ydre Væg listeformede Fremstaaenheder af fibrillært Binde- 

 væv, Tab. XVII, Fig. le, 11. 12 k der har sin Epi- 

 thelialbeklædning, bestaaende af lange smale Cylinder- 

 celler, som have en meget tynd Membran og en allaug 

 Kjerne med Kjernelegeme, omgiven af en gjennemsigtig 

 Protoplasmamasse, Tab. XVIII, Fig. 2 d. Bindevævslisterne 

 ere ordnede saaledes, at enkelte ere 'mere fremspringende 

 end andre, og det ser ud. som de afbrydes ved Skilleveggene; 

 thi i det Kum, der dannes imellem to Septa, rage Listerne 

 langt frem i Midten af Kammeret, ligesom de aftage i 

 Bredde, jo mere de nærme sig Septa. Tab. XVIII, Fig. 2. 

 Det Hele faar et Udseende i Mikroskopet, som om Spise- 

 røret og Tarmkanalen ere omgivne af en Bindevævskrave. 

 dækket af Oylinderceller, forsynede med Cilier ; men om 

 der kun er en eller flere Cilier paa hver Celle, har det 

 ikke været muligt at iagttage. Egentlig kunne disse Binde- 

 vævslister betragtes som rudimentære Septa ; men saa ei- 

 der det Særegne ved dem, at de udgaa fra Spiserøret og 

 Tarmkanalen og ikke fra Kropsvæggen, og at de tiltage i 

 Bredde, jo mere de nærme sig Dyrets Bagdel, saa at de 

 ere bredest omkring Rectum. Imellem Epithelet og Binde- 

 vævet er der en yderst fin Membran (Peritonæum), hvortil 

 Cylindercellerne ere fæstede, og som dækker et tyndt Lag 

 cirkulære Muskelfibre, Tab. XVIII, Fig. 2 e. der synes at 

 være Fortsættelse af Skillevæggenes Muskulatur, og som 

 støde til et meget bredt Bindevævslag, Tab. XVIII, Fig. 

 2 /. Dette er stærkt fibrillært og forsynet med en Mængde 

 Bindevævslegemer med en eller flere Udløbere, samt 

 Ernæringskanaler med deres Epithel. Fra dette Binde- 

 vævslag udgaa temmelig lange, koniske Prolongationer, 

 Tab. XVIII. Fig. 2 g, som i væsentlig Grad bidrage til 

 at danne Folderne paa Spiserørets og Tarmkanalens indre 

 Væg, Tab, XVII, Fig. 7 /; Tab. XVIII, Fig. 2 g. Paa 

 den indre Flade af Bindevævet og dets Forlængelser er 

 et stærkt udviklet Muskellag, Tab. XVIII, Fig. 2 h, der 

 dannes af Tver- og Længdeiibre, og som er beklædt med 

 et tykt Epithel, bestaaende af forholdsvis brede Cylinder- 

 celler, forsynede med temmelig lange Cilier, Tab. XVII, 

 Fig. 7 g; Tab. XVIII. Fig. 2 i. Imellem Cellerne sees 

 aflange, encellede Slimkjertler, der med sin Udførselsgang 

 munker ud paa Epithelets Overflade. 



Hvad nu Nervesystemet angaar, saa har jeg ikke ret 

 meget at berette derom; imidlertid viser dog det Lidet, jeg 

 kan meddele, at F en ja mirabilis ikke i saa Henseende atviger 

 væsentlig fra det af Brødrene Hertwig først paaviste Nerve- 

 system hos Actinierne. Lige under Mundskiven, umiddel- 

 bart indenfor (under) Ectodermet, imellem dette og Binde- 

 vævet, iagttages et smalt Lag, der er finkornet, og som ved 

 Maceration fulgte med Ectodermet. Foruden de fine, runde, 

 glinsende Korn (overskaarne Nervefibriller) sees hist og 

 her store Ganglieceller med en stor, næsten rund Kjerne, 



On transversal section of the outer wall ut' the gullet- 

 tube and intestinal canal, fillet-formed protuberances of 

 fibrillous connective-tissue are seen (Pl. XVII, fig. 7 e, 

 11, 12 6), whose epithelial covering consists of long. narrow. 

 cylinder-cells with a very thin membrane, and an oblong 

 nucleus with corpuscle surrounded by a transparent proto- 

 plasmic mass (Pl. XVIII, fig. 2 d). The connective-tissue 

 fillets are arranged in such manner, that a few of them 

 are more prominent than others, and it appears as if they 

 are broken off by the septa. as in the space formed 

 between two septa the fillets reach far forward into the 

 middle nt' the chamber, whilst they also diminish in breadth 

 the closer they approach to the septa (Pl. XVIII, fig. 2). 

 The whole object appears, under the microscope, as if the 

 gullet-tube and intestinal canal are surrounded by a collar 

 of connective-tissue, covered by cylinder-cells furnished with 

 eiliæ, but whether there is only one, or several eiliæ on 

 each cell, it has not been possible for me to observe. 

 These connective-tissue fillets may be regarded as really 

 rudimentary septa, but there is this peculiarity about them. 

 that they issue from the gullet-tube and intestinal canal 

 and not from the wall of the body, and that they increase 

 in breadth the nearer they approach to the posterior part 

 of the body of the animal, so that they are broadest round 

 the rectum. Between the epithelium and the connective- 

 tissue there is an extremely fine membrane (Peritoneum) 

 to which cylinder-cells are attached, and which covers a 

 thin layer of circular muscle fibres (Pl. XVIII, fig. 2 é) 

 that appear to be a continuation of the musculosity of the 

 septa, and unite to a very broad laver of connective- 

 tissue (Pl. XVIII, fig. 2 /). This layer is strongly fibril- 

 lous, and is furnished with a multitude of connective-tissue 

 corpuscles having one or several prolongations, and also 

 with nutritory ducts with their epithelium. From this 

 connective-tissue laver, pretty long, conical prolongations 

 issue (Pl. XVIII, fig. 2 g), which in a material degree 

 contribute to form the folds on the inner wall of the 

 gullet-tube and intestinal caual (Pl. XVII, fig. 7 /; Pl. 

 XVIII, fig. 2 g). On the inner surface of the connective- 

 tissue and its prolongations, there is a strongly developed 

 muscular laver (Pl. XVIII, fig. 2 li), formed of trans- 

 versal and longitudinal fibres, and which is clad with a 

 thick epithelium consisting of relatively broad cylinder- 

 cells furnished with rather long eiliæ (Pl. XVII, fig. 7 g; 

 Pl. XVIII, fig. 2 i). Between the cells oblong unieellular 

 mucous glands are seen. w r hose excremental ducts open 

 upon the surface of the epithelium. 



As regards the nervous system, I have not very 

 much to say; however, the little I have to report enables 

 me to say, that in Fenja mirabilis the nervous system does 

 not differ materially from that of the Actiniæ first shown 

 by the Brothers Hertwig. Just below the oral disc, im- 

 mediately inside (below) the ectoderm, between it and the 

 connective-tissue, a narrow layer is observed. which is 

 finely granular and upon maceration followed with the 

 ectoderm. Besides the minute, round, shining grains 

 (transsected nerve-fibrills), there are seen. here and there, 



