

40 



Ende og nu ere ordnede i en regelmæssig Tværrad, der 

 indtager den l l / 2 sidste Vending af Strengen. Denne Om- 

 dreining foraarsages derved, at Stilkens skaalformigt udvi- 

 dede Ende indgaar i Kapselens Dannelse, og idet den 

 voxer mere og mere langs nedad dennes ene Side (Fig. 

 31), fører Strengens proximale, ved sine store gule Nessel- 

 celler kjendelige Ende med sig, saa at denne omsider kom- 

 mer til at ligge ved Kapselens distale Ende. 



De store gule Celler (Fig. 34) indslutte en i mangfol- 

 dige Bugter slynget fin Nesseltraad, som synes at være 

 indplantet paa en tykkere Del ligesom et Skaft, der er be- 

 liggende nærmest ved den smalere Ende af Cellen. De 

 talløse Nesselceller, som besætte de øvrige Vendinger, paa 

 hvilke de staa lodrette og tæt sammentrængte, ere meget 

 smaa (Fig. 35), langstrakt-elliptiske og noget bøiede; de 

 syntes at indslutte en mangfoldig spiraldreiet Nesseltraad, 

 som dog kun utydeligt kunde skjelnes. 



Ingen af de af mig iagttagne Nesselknopper viste flere 

 end 5 Spiralvendinger; hvormod Claus (1. c. Tab. 26, Fig. 

 26) hos P. hydrostatica afbilder 9 — 10 saadanne, og Ge- 

 genbaur (1. c. Fig. 42) bemærker, at Spiralen hos de fuld- 

 komneste Nesselknopper opløser sig og ligger sammen- 

 slynget i uregelmæssige Vendinger, hvilket ogsaa er syn- 

 ligt hos nogle af de af mig fra Middelhavet hjembragte 

 Exemplarer. 



Nesselknopperne af P. borealis afvige fra samme af 

 P. hydrostatica ved Kapselens but tilrundede (ikke tilspid- 

 sede) distale Ende, ved Mangelen af de 2 tilspidsede Side- 

 flige, og ved Nesselstrængens ringere Antal af Spiralven- 

 dinger. 



KJØNSVEDHÆNGENE. 



Kjønsvedhængene (Gonophorerne) ere anbragte i Rum- 

 met mellem Følerne og Sugerørene, altsaa netop paa Ran- 

 den af Skivens ydre Bue, et Par for hvert Afsnit. Lige- 

 som alle de før omtalte Vedhæng spire de frem fra den 

 smalere Ende af Skiven og tiltage gradvis i Størrelse mod 

 den bredere. De have ligesom hos P. hydrostatica Form 

 af Drueklaser, idet de talrige Knopper, der indslutte Kjøns- 

 stofferne, sidde fast paa cylindriske, fra Stammen (Skiven) 

 udgaaende Stilke (gonoblastidia, Huxley). Hver af disse 

 Drueklaser (Fig. 14) viser sig ved nærmere Betragtning 

 at bestaa af to i Udseende forskjellige Hovedgrene, den 

 ene stillet udenfor eller rettere ovenover den anden, hvilke 

 have deres Udspring saa ganske tæt ved hinanden, at de 

 synes at udgaa fra en fælles Basis. Knopperne paa den 

 øverste Gren (Fig. 14, q), som vender mod Følerne, danne 

 nemlig talrige, meget smaa, tæt sammenhobede rundagtige 

 Bær; men paa den underste (ibid. m.), som vender mod 

 Sugerørene, ere de færre i Antal, større og af langstrakt, 

 næsten cylindrisk Form. Hertil kommer endnu den For- 

 skjel, at den øverste Gren eller Stamme er forgrenet, den 

 nederste derimod simpelt traaddannet. Hin bærer lutter 

 kvindelige, denne lutter mandlige Kjønsknopper. 



thread-cells which were previously situated nearest to the 

 base of the capsule, are now situated nearest to its extre- 

 mity and arranged in a regular transverse row occupying 

 the last l l / a coils of the chord. This revolution is caused 

 by the calyx-like enlarged extremity of the stem going in- 

 to the formation of the capsule, and, while growing more 

 and more along one side of it downwards (fig. 31), carry- 

 ing in the same course the proximal extremity of the chord 

 — (recognisable by its large yellow thread-cells) -— which 

 thus comes at last to the distal extremity of the capsule. 



The large yellow cells (fig. 34) enclose a fine urticary 

 filament, twined in many coils, which seems to be planted 

 on a thicker part as if on a shaft situated nearest to the 

 narrower extremity of the cell. The innumerable thread- 

 cells covering the other coils on which they stand perpen- 

 dicularly and closely compressed, are very small (fig. 35) 

 elongated, elliptical and somewhat curved; they appeared 

 to contain a many-coiled spiral urticary filament, which 

 however could not distinctly be perceived. 



None of the urticary knobs observed by me shewed 

 more than 5 spiral coils ; but Claus (1. c, Tab. 26, fig. 26) 

 in P. hydrostatica delineates 9 — 10 of them, and Gegen- 

 baur (1. c, fig. 42) remarks that the spiral in the most per- 

 fect urtinary knobs becomes decomposed and lies twisted 

 together in irregular coils, which is also apparent in some 

 of the specimens brought home by me from the Mediter- 

 ranean. 



The urticary knobs of the P. borealis differ from those 

 of the P. hydrostatica in the obtusely rounded (not pointed) 

 distal extremity of the capsule, in the absence of the 

 2 pointed lateral lobes, and in the smaller number of the 

 spiral coils of the urticary chord. 



THE SEXUAL APPENDAGES. 



The sexual appendages (Gonophores) are placed in 

 the interval between the feelers and the suction-tubes, 

 that is just at the margin of the exterior curve of the disc, 

 a pair for each section. Like all the appendages previous- 

 ly mentioned, they issue from the narrower end of the disc, 

 and increase gradually in size towards the wider end. They 

 have, as in the P. hydrostatica, the form of clusters (bun- 

 ches of grapes); the numerous buds which contain the 

 sexual matter being attached to cylindrical stalks proceed- 

 ing from the axis (the disc) (gonoblastidia Huxley). Each 

 of these clusters (fig. 14) is found on closer examination 

 to consist of two main branches differing in appearance, 

 one placed outside of, or more properly above the other, 

 and issuing at first so closely together that they seem to 

 proceed from a common base. The buds on the upper 

 branch (fig. 14, q) which are turned towards the feelers, 

 form numerous very small closely congregated roundish ber- 

 ries; but on the lower branch (ibid, m) which is turned 

 towards the suction-tubes, they are fewer in number, larger 

 and of an elongated nearly cylindrical form. There is also 

 the difference that the upper branch or stem is branched, 

 while the lower on the contrary is simply filiform : the for- 



