155 



Forbindelse imellem dem og Tannens Linnen existerede 

 ikke; thi der er et meget bredt Bindevævslag, som skarpt 

 adskiller disse Dele fra hinanden. 



Spiserørets og Tarmens Bindevæv er meget bredt, 

 stærkt fibrillært, rigt paa Bindeyævslegemer og Ernærings- 

 kanaler. og paa dets ydre Væg findes longitudinelle og 

 transverselle Muskler. Fra dette Bindevævs indre Flade 

 udgaa tykke, lange Forlængelser, der rage ind i Spiserørets 

 og Tarmens Linnen og danne de betydelige Folder, som 

 her tindes. Tab. XIX. Fig. 1 g. Disse Bindevævsbjælker 

 ere beklædte med temmelig hoie Cylinderceller, der bære 

 Cilier, Tab. XIX. Fig. 1 h, og imellem hvilke iagttages 

 hist og lier encellede Slimkjertler; især synes den bagre 

 Del af Tarmen at være rig paa saadanne Kjertler. 



Tversnit at den bagre Del af Rectinn. just hvor der 

 paa den ydre Flade findes de omtalte fine Spalter, viser, 

 at disse Spalter fore direkte ind i Tarmen. Denne er 

 paa dette Sted meget udvidet, og fra dens indre Flade 

 bugter nd 12 Kanaler, som ere aflange, passere igjennem 

 Bindevævet, der her ikke er meget bredt og munder nd 

 netop i Mellemrummet af 2 Septa, hvor den nævnte Spalte 

 tindes. Tab. XIX. Fig. 3 r. Disse Kanaler ere beklædte 

 med Epithel, bestaaende af cilierende Cylinderceller. Tab. 

 XIX. Fig. •'> d, lig det, der beklæder den indre Tarmvæg, og 

 imellem sees hist og hei- enkelte aflange. ganske klare og 

 tomme Celler, som sandsynligvis ere Slimkjertler, Tab. XIX, 

 Fig. 3 e. Her synes næsten at være en Slags Kloakdan- 

 oelse, hvori Spalterne aabne sig. Paa det afbildede Tver- 

 snit sees kun 4 saadanne Kanaler; men der er virkelig 

 12. som ere paaviselige ved at sammenholde flere paa 

 hinanden følgende Snit. hvorved det sande Antal fremkom- 

 mer. Her findes altsaa en direkte Kommunikation imellem 

 Kamrene og Tarmen, hvilket ikke er Tilfældet hos Feuja 

 mirabilis, hvor de antagne Genitalspalter. som findes i 

 Bunden af Kamrene udenfor Rectum, aabne Isig omkring 

 denne, imellem de beskrevne Hudpapiller eller Folder, og 

 saaledes kommunicere direkte med det ydre Medium (Sø- 

 vandet). Men begge disse Slags Spalter udføre visselig 

 den samme Funktion. nemlig at fore Afkommet udenfor 

 Lesemet. 



De 12 Septa bære alle Mesenterialfilamenter og 

 Grenerationsorganer, Tab. XVIII, Fig. 7. De første ud- 

 springe ved Spiserørets forreste Del. lige under Mundaab- 

 ningen. ere festede til Bindevævsmembranen, der danner 

 Septum, og strække sig slangeformigt bagover til omtrent 

 Midten af Tarmen. 



Æggestokkene ligge udenfor Mesenterialfilamenterne, 

 hengere fjernede fra Spiserøret og Tarmen, men udspringe 

 forrest ved Spiserøret under Mundskiven og strække sig 

 bagover, næsten lige til Grenitalspalterne. Paa enkelte 

 Septa vare de dog ikke saa lange, men strakte sig kun 

 noget bagenfor den forreste Halvdel af Tarmen: dog tor 



may come in contact. No correspondent connection be- 

 tween them and the channel of the intestine exists. as 

 there is a very broad connective-tissue laver, which sharply 

 defines those parts from each other. 



The connective-tissue of the gullet-tube and the 

 intestine is very broad, strongly fibrillous, and rich in 

 connective-tissue corpuscles and nutritory ducts, and upon 

 its exterior surface longitudinal and transversal muscles 

 are found. From the inner surface of this connective- 

 tissue, thick. long prolongations issue. which extend into 

 the channels of the gullet and intestine and form the 

 large folds that are here observed (Pl. XIX. fig. 1 g), 

 These connective-tissue beams are clad with pretty long 

 cylinder-cells carrying ciliæ (Pl. XIX, fig. 1 ln between 

 which unicellular mucous glands are here and there ob- 

 served: especially does the posterior part of the intestine 

 appear to be rich in such glands. 



A transversal section of the posterior part of the 

 rectinn, just at the point where the fine fissures previously 

 mentioned are found upon the exterior surface. shows, that 

 those fissures lead direct into the intestine. In this situa- 

 tion the intestine is niucli dilated, aud from its inner 

 surface 12 canals bulge out; these are oblong, penetrate 

 through the connective-tissue. which is hei' not very 

 broad, and open out exactly in the interval between 2 

 septa. where the fissure named is found (Pl. XIX. fig. 

 :; c These canals are clad with epithelium consisting of 

 ciliating cylinder-cells (Pl. XIX, fig. 3 cl), like that which 

 clothes the inner wall of the intestine, and in it there are 

 seen here and there. a few oblong, quite clear and empty 

 cells, which are, presumably, mucous glands iPl. XIX, fri. 

 3 e). Here there appears to be almost a kind of cloacum 

 into which the fissures open. In the transversal section 

 illustrated 4 such canals are seen. but there are really 12. 

 which may be observed on comparison of several closely con- 

 tinuous sections, by which the true number is brought out. 

 Here. therefore, a direct communication between the cham- 

 bers and the intestine is found. which is not the case in 

 Fenja mirabilis. where the presumable genital fissures 

 found in the bottom of the chambers. outside the rectum 

 open around it. between the integumental papillæ or 

 folds described. and thus communicate direct with the 

 external medium (the sea-water). But botli those descrip- 

 tions of fissures certainly perform the same funetion viz. 

 to lead the offspring out of the body. 



All the 12 septa carry mesenterial filaments and re- 

 productive organs (Pl. XVIII, fig. 7). The first issue 

 from the anterior part of the gullet-tube. exactly under 

 the oral aperture. and are secured to the connective-tissue 

 membrane that forms the septum, and retreat sinuously, 

 backwards, to about the middle of the intestine. 



The ovaries are situated outside the mesenterial 

 filaments, farther from the gullet-tube and the intestine. but 

 issue in front at the gullet-tube, under the oral disc. and 

 extend backwards almost right to the genital fissures. In 

 a few septa, however. they were not so long, but extended 

 only a Little way behind the anterior half-part of the 



2i i * 



