21 



og rækker i udstrakt Tilstand med dens forreste frie 

 Ende, paa hvilken den simpelt runde Mundaabning uden 

 Vedhæng eller Tentakler er anbragt, ikke ganske frem til 

 Kapperanden. Den indtager formedelst dens Smalhed 

 kun liden Plads i Kappens Hule, hvor den sædvanlig er 

 bøiet til den ene Side, saaledes at Munden ligger tæt 

 hen imod den kortere Side af Kappen (se Fig. 3). 



Fra Mavens noget udvidede Grund løbe 4 linieformige 

 hyaline Radiærcanaler (Fig. 2, 3, d, d) i lige Afstand fra 

 hverandre langs ad Kappens indre Flade (Subumbrella) hen 

 til dens Rand, hvor de ende hver med en rundagtig blod- 

 rød Opsvulmning (Bulbus) (h, h), hvilke forbindes ved en 

 circulær Randcanal. Kappens Aabning er indentil garne- 

 ret med den hos alle lavere Meduser forekommende tynde 

 ringförmige Randhud (Diaphragma, Velum) (Fig. 2, c). 



Af de nys nævnte 4 røde Opsvulmninger (Bulbi) ere 

 de 3 (Fig. 2, 3, h, h) af ens Størrelse, smaa, rundagtige 

 og indsænkede (ikke hævede over Hudens Overflade) ; men 

 den fjerde (g) stor, langt fremragende og trelappet; fra 

 den ydre Ende af hver af disse Lappe (Fig. 5), af hvilke 

 den midterste (g) er størst og pæreformig (Spidsen udad- 

 vendt), Sidelappene (#' g') neppe halvt saa store og af- 

 lange, udgaar der en lang Randtraad (Fig. 2, 3, f). Disse 

 3 Lappe ere derfor egentlig at betragte som fortykkede 

 Rødder af Randtraadene. Denne trelappede Opsvulmning^ 

 hvori Steenstrup (1, c, pag. 23) formoder at Genitalierne 

 udvikle sig, var hos cle iagttagne Individer indvendig fyldt 

 med en celluløs af runde Smaablærer bestaaende Masse 

 (se Fig. 5), som dog ikke viste noget Spor af Kjønsstof- 

 fer. De 3 øvrige Bulber, som ere flere Gange mindre 

 end den trelappede, udsende ingen Randtraade. 



Alle 3 Randtraade (Fig. 2, 3, f) ere af lige Størrelse, 

 i udstrakt Tilstand 5 — 6 Gange længere end Kappen, 

 traaddannede, overmaade tynde og hyaline; under Dyrets 

 Bevægelser, som ere temmelig livlige, opvikles de gjerne 

 i talrige smaa løse Spiraler ligesom en udtrukken Skrue. 

 Betragtede under Mikroskopet (Fig. 5, f & Fig. 6) vise de 

 sig i deres hele Længde besatte med meget smaa blære- 

 formige Nesselkapsler, hvilke samle sig til ophøiede Ringe 

 (Fig. 6, a, a) stillede i regelmæssig Afstand fra hverandre 

 og, som det forekom mig, kun paa den ene Side af Rand- 

 traadene. Ed lignende ringet Anordning af Nesselkaps- 

 lerne vise, som ovenfor allerede er omtalt, de nederste 

 Tentakler hos Corymorpha annulicornis, og Cobbald af- 

 bilder Randtraadene af Thaumantias achroa ganske lige- 

 dan (Qvart. Microskop. Journal, 1857, No. 21, Tab. 1, 

 Fig. 3, 4). 



Jeg fandt denne lille smukke Meduse svømmende nær 

 ved Søens Overflade ved Florøen i Søndfjord den 9de Mai 

 1836 i 3 fuldkommen med hverandre overensstemmende 

 Exemplarer. Den 26de Mai 1838 fandt jeg atter 3 Ex- 

 emplarer, af hvilke det ene i alle Henseender lignede de 

 ovenfor beskrevne; men de 2 andre, som vare ganske 

 lidt mindre, havde kun en eneste Randtraad udgaaende 



interior cavity of a form corresponding to its exterior 

 contour; and its anterior free extremity, where is the 

 simple round oral aperture, without any appendages or 

 tentacles, reaches, when extended, very nearly to the mar- 

 gin of the umbrella. The stomach occupies very little 

 space in the cavity of the umbrella, where it is usually 

 bent to one side ; so that the mouth lies close against 

 the shorter side of the umbrella (see fig. 3). 



From the somewhat enlarged base of the stomach, 4 

 linear hyaline radial canals (fig. 2, 3, d, d) run at equal 

 distances from each other, along the interior surface of 

 the mantle (subumbrella) to its margin, where they ter- 

 minate, each in a roundish blood-red bulb (h h) ; these 

 bulbs are connected by a circular marginal canal. The 

 aperture of the umbrella is garnished inwardly with the thin 

 annular marginal membrane (diaphragm, velum) (fig. 2, c). 



Of the 4 red bulbs above mentioned, 3 (Hg. 2, 3, 

 h h) are of the same size, small roundish and sunk (not 

 raised above the surface of the skin); but the fourth (g) 

 is large prominent and three-lobed; from the outer extre- 

 mity of each of these lobes (fig. 5), — of which the 

 middle one (g) is largest and pear-shaped, (the point 

 turned outwards) the side-lobes {g' g') scarcely half as 

 large and oblong — there issues a long marginal fila- 

 ment (fig. 2, 3, f). These 3 lobes may therefore pro- 

 perly be considered as enlarged roots of the marginal 

 filaments. This three-lobed bulb, in which Steenstrup 

 (1, c, page 23) presumes that the genitals develop them- 

 selves, was, in the specimens examined, filled with a cel- 

 lular substance consisting of small round vesicles (see 

 fig. 5) which did not however exhibit any trace of sexual 

 matter. The 3 other bulbs, which are many times smal- 

 ler than the three-lobed bulb, do not emit any marginal 

 filaments. 



All 3 marginal filaments (fig. 2, 3, f) are of similar 

 size — when extended 5 — 6 times longer than the um- 

 brella — filiform, extremely thin and hyaline; during the 

 movements of the animal, which are rather lively, the 

 filaments are often coiled in numerous small loose spirals 

 like a drawn out screw. Examined under the microscope 

 (fig. 5, f, fig. 6) they appear in their whole length cover- 

 ed with very small vesicular thread-cells collected into 

 raised rings (or half rings) (fig. 6, a, a) at regular inter- 

 vals and, as it appeared to me, only on one side of the 

 marginal filaments. A similar annular arrangement of 

 the thread-cells appears, as before mentioned in the 

 lower tentacles of Corymorpha annulicornis; and Cobbald 

 delineates in like manner the marginal filaments of Thau- 

 mantias achroa. (Quart, Microscop. Journal 1857, No. 21, 

 Tab 1, fig. 3, 4). 



On the 9. May 1836, I found three perfectly simi- 

 lar specimens of this pretty little Medusa swimming near 

 the surface of the sea at Floröen in Söndfjord. On the 

 26. May 1838, I found again 3 specimens, one of which 

 resembled in all respects those above described; but the 

 other two, which were very little smaller, had only a 

 single marginal filament issuing from the larger lobed 



