79 



deise og red at udvide Kropsvæg og Svælgrør til Siderne, 

 Tab. XXII, Fig. 9, viste det sig. at de indre Ddc vare 

 mindre godt konserverede, idet en Del al' Septa med deres 

 Mesenterialfilamenter og Generationsorganer befandtes i en 

 opløst Tilstand. Kun Septaernes Tilheftninger til den indre 

 Kropsvæg og Svælgrøret vare saavidt bevarede, at de 

 kunde tjene til Undersøgelse. Ai' denne fremgaar det, at 

 der er 12 Par Septa, hvoraf (i Par ere fuldstændige, det 

 vil sige, inserere sig paa Svælgrøret, Tab. XXII. Fig. '.> n. 

 imedens de øvrige <i Par eie ufuldstændige og strække sig 

 henimod Svælgrøret uden at nau, dette. Tab. XXII. Fig. 9 b. 

 At' de li Par fuldstændige Septa er der sandsynligvis 2 

 Par, som kunne ansees for Retningssepta, omendskjønt jeg 

 ikke med Bestemthed kan paavise dem ; men der er 2 Par, 

 som ere stillede saaledes, at de fæste sig paa Svælgrorets 

 ydre, modsatte Sider og ere meget stærkere i Bygning end 

 de øvrige, Tab. XXII, Fig. 9 c. Musklerne ere ødelagte 

 saagodtsom paa alle Septa i den ovre Del af Gastrovas- 

 kularhulheden, saa der ingen Veiledning er at erholde ved 

 dem. derimod skulle vi senere se. at Septaerne ere bedre 

 konserverede i Stilken. 



De ufuldstændige Septa ere noget smalere, staa ind- 

 byrdes tættere sammen, saa det intraseptale Ruin er meget 

 smalt, og strække sig paa, nogle Millimeter nær hentil 

 Svælgrøret. Samtlige Septa I Nere Mesenterialfilamenter, 

 hvoraf der kun tindes Rester. De ufuldstændige Septa 

 bære Generationsorganer. 



Til et fuldstændigt Septum lige ved Svælgrøret er 

 fæstet en Acontie, der er overmaade rig paa Xematocyster, 

 Innesten bygget som sædvanligt; kun denne ene lykkedes 

 det mig, at tinde, Tab. XXII, Fig. 10. 



Svælgrorets indre Flade har stærkt udprægede Længde- 

 folder og er beklædt med et bredt Epithel, Tal). XXII, 

 Fig. 9 d; nogen Svælggrube var ikke at opdage. Ved 

 at lotte det spaltede Svælgrør op sees de to Rækker af 

 de indtrukne Tentakler, hvoraf de i den ydre Række ere 

 temmelig medtagne. 



Paa Tversnit af den inkrusterede Kropshud sees, a.t 

 det ydre. tykke Dække dannes af en temmelig tyk, seig 

 Slimmembran, hvori de fremmede Legemer ere indleirede, 

 Tub. XXII, Fig. 11 a. Indenfor denne er et Epithel 

 (Ectoderm), bestaaende af hoie Oylinderceller, forsynede 

 med Kjei ne og Kjernelegeme, Tab. XXII, Fig. 11 b; 

 Tab. XXIII, Fig. 2 a. Imellem disse Celler ligger en 

 stor Mængde noget spredte, encellede Slimkjertler, der ere 

 kolbeformede og fyldte med en kornet Masse, som for Storste- 

 delen skjuler Kjernen, Tab. XXIII, Fig. 2 b, samt enkelte 

 Xeinatocyster. I Ectodermet sees de for omtalte Suge- 

 vorter; di' ere cylindriske, have paa den næsten tvers af- 

 skaarne Ende en Sugeskive og ere udvendig beklædte med 

 et Epithel, hvis ('eller ere noget mindre (lavere) end 

 Ectodermets. Tab. XXIII, Fig. 2 d. Deres indvendige 

 Væg er beklædt med næsten runde (.'(dier, der have en 



commencement of the stem. and upon widening the body- 

 wall and the gullet-tube Literally (Pl. XXII, fig. 9), it ap- 

 peared that the internal portions were indifferently well 

 presi rved, as a portion of the septa. with their raesenterial 

 filaments and reproductive organs, were found to be in a 

 putrid state. Only the septal attachments to the inner 

 body-wall and the gullet tube were sufficiently well pre- 

 served that they could serve for purposes of investigation. 

 I-' rom this investigation it åppears, that there are 12 pairs 

 of septa, of whieh ti pairs are perfect, that is to say, they 

 iusert themselves on the gullet-tube I Pl. XXII, fig. 9 a), 

 whilst the other li pairs are imperfect and extend towards 

 the gullet-tul)e without, however, reaching it (Pl. XXII, 

 fig. 9 b). Of the 6 pairs of perfect septa. there are pro- 

 bably 2 pairs that may be considered to be directive septa, 

 although I am unable, with precision, to point them out; 

 but there are 2 pairs placed in such a manner, that they 

 secure themselves to the exterior opposite sides of the 

 gullet-tube. aud are mucli stronger in structure than the 

 others (Pl. XXII. fig. 9 c). The muscles are destroyed 

 upon nearly all the septa in the superior part ot the 

 gastro-vascular cavity, so that no assistance is to be had 

 from them, but. on the other hand. \ve shall subsequently 

 see that the septa are hetter preserved in the stem. 



The imperfect septa are somewhat narrower, and are 

 placed closer together and to each other. so that the intra- 

 septal spaces are very narrow, and extend to within a few 

 millimetres oi the gullet-tube. All the septa carry raes- 

 enterial filaments, of which remains only are found. The 

 imperfect septa, carry reproductive organs. 



An acpntia is adherent to a perfect septum close to 

 the gullet-tube, which is extremely rich in nematocysts, and 

 otherwise constructed as usual. Only this single one have 

 I been fortunate enough to find (Pl. XXII. rig. 10). 



The inner surface of the gullet-tube has strongly 

 distinguished longitudinal folds, and is covered with a 

 broad epithelium (Pl. XXII, fig. 9 d). It was not pos- 

 sible to discover a ny gullet-groove. Upon raising the fis- 

 sured æsophagus the 2 series of retracted téntacles are 

 observed, of which those in the outer series are consider- 

 ablv damaged. 



Upon transsection of the encrusted integument of the 

 body it is seen. that the external thick covering is formed by 

 a rather thick, viscid, mucous membrane, in which the foreign 

 bodies are entrenched (Pl. XXII, fig. 11 a). Inside this 

 there is an epithelium (ectoderm) consisting of high' cylin- 

 der-cells furnished with a nucleus and nucleus corpuscle 

 (Pl. XXII. fig. 11 6; Pl. XXIII, fig. 2 a). Between those 

 cells there lie a great multitude of somewhat scattered 

 unicellular mucous glands, claviform in shape, and filled 

 with a. granular substance, which for the greater tpart con- 

 ceals the nucleus (Pl. XXIII, fig. 2 b), and also a few 

 nematocysts. In the ectoderm are seen the previously meii- 

 tioned suckers; they are cylindrical, and on the almost 

 truncate extremity have a sucker disc; externally they are 

 clad with an epithelium whose cells are somewhat less 

 (lower) than those of the ectoderm (Pl. XXIII, fig. 2 d) 



