hos de før omtalte yngre Gemmer, ganske farveløs og 

 vandklar, Maven og Randknuderne samt alle Kar opak 

 hvide. Paa Randknuderne saavelsom paa den smalere frie 

 Ende af Maven (Mundpartiet) bemærkedes talrige rund- 

 agtige Nesselkapsler, af hvilke udkom en meget lang og 

 fin lige eller børsteformig Nesseltraad* 



Hos alle disse største eller mest udviklede Meduse- 

 gemmer bemærkedes af og til selvstændige og livlige Bevæ- 

 gelser af Kappen, en Systole og Diastole ligesom for at løs- 

 rive sig fra deres Ammedyr. Hyppig trak Kappen sig 

 ogsaa sammen i longitudinal Retning, hvorved den blev 

 saameget bredere, og hvorved den ydre Halvdel af Maven 

 straktes frem udenfor Kappens Aabning (Fig. 24). Genera- 

 tionsorganer bemærkedes ikke hos nogen af disse Gemmer. 



I Sommeren (Midten og Slutningen af Juni) 1866 

 observerede min Søn denne Art ved Fiskeværet Skraaven 

 i Lofoten, hvor den forekommer i stor Mængde paa en 

 enkelt Localitet, 12—20 F. D. grov Sandbund, (Tab. 4, 

 Fig. 9 — 23). De største Exemplarer vare 3^" lange, altsaa 

 betydelig større end de af mig ved Reine iagttagne, med 

 hvem de forresten paa det nøieste stemmede overens. De 

 mindste fundne Individer, der vare 5 M.m. lange, havde 

 endnu ingen Gemmer; derimod vare disse allerede til- 

 stede paa Individer af 10 M.m. Længde, men kun faa i 

 Antal, skjøndt forholdsvis ret store (de største vare 1^ M.m. 

 lange). Gemmestilkenes Tal varierede lios de forskjellige 

 Individer efter Størrelsen og gik hos de største op til 

 mere end 24, hvoraf dog 6—10 vare meget smaa og ure- 

 gelmæssigt stillede mellem de større. Disse sidste vare 

 forholdsvis betydeligt længere end hos de af mig ved Reine 

 iagttagne Individer, idet enkelte af dem opnaaede den 

 anseelige Længde af 12 M.m., og havde undertiden foru- 

 den Endegrenene en liden accessorisk Gren paa Midten 

 af deres Længde (Fig. 9). Gemmerne selv vare talrigere 

 og ogsaa viderekomne end de af mig iagttagne, de største 

 indtil 4 M.m. lange, og, hvad der var af stor Interesse, 

 de indeholdt hos de fleste Individer tydeligt udviklede 

 Generationsstoffe. — Alle Medusegemmer paa en Amme 

 vare altid af ens Kjøn. Hungemmerne kjendes let ved den 

 større Gjennemsigtighed af deres Manubrium og dettes 

 bleg rosenrødlige Farve, som hidrører fra de sig udvik- 

 lende Æg. Hangemmerne ere kjendelige ved deres opake, 

 hos nogle brunrødlige, hos andre lysegule Manubrium; 

 Spermatozoiderne (Fig. 22), som udvikles i Væggene af 

 Manubrium, ere overmaade smaa, med oval Krop og ikke 

 meget lang traaddannet Hale, og bevæge sig meget livligt. 



Manubrium (b) er hos de udviklede Hangemmer (Fig. 21, 

 23) noget længere end hos Hungemmerne (Fig. 10—12) 

 og rækker et lidet (Fig. 21), ofte ogsaa et langt Stykke 

 (Fig. 23), udenfor Aabningen af Kappen, hos Hungem- 

 merne derimod i det høieste til denne Aabning, ikke udenfor 



living animal is in a constant state of circulation. The 

 umbrella is, as in the younger germs above mentioned, 

 quite colorless and pellucid; the manubrium, the margi- 

 nal tubercles and all the vessels are opaque white. On 

 the marginal tubercles, as well as on the thinner free end 

 of the manubrium (the oral part) there were numerous 

 roundish thread-cells, from each of which issued a very 

 long and fine straight bristle-like urticary filament. 



In all these largest or most developed gonozooids 

 spontaneous and animated movements of the umbrella 

 were occasionally observed; a systole and diastole as if 

 with the object of separating themselves from the parent 

 animal. Frequently also the umbrella was contracted in 

 a longitudinal direction, whereby it became so much 

 wider, and whereby the outer half of the manubrium be- 

 came protended beyond the aperture of the umbrella 

 (fig. 24). No organs of generation were observed in any 

 of these germs. 



In the summer of 1866 (in the middle and latter part 

 of June) my son observed this species at the fishing-place 

 Skraaven in Lofoten, where it occurs very abundantly in 

 one single locality at the depth of 12 — 20 fathoms on 

 coarse sand (Tab. 4, fig. 9 — 23). The largest specimens 

 were 3V 2 " long, that is much larger than those which I 

 observed at Reine, but otherwise agreeing most minutely 

 with the same. The smallest specimens found, which 

 were 5 M.m. long, had not yet any gonozooids; while 

 those of 10 M.m. length had gonozooids, few in number 

 though relatively large, (the largest of these were lV 2 M.m. 

 long). The number of the reproductive stalks varied in 

 different individuals according to size; the largest speci- 

 mens having as many as 24 stems, whereof however 

 6 — 10 very small and irregularly distributed among the 

 others, which latter were much longer in proportion than 

 the stems of the specimens observed by me at Reine, 

 some few of them even attaining a length of 12 M.m. 

 and having, besides terminal branches, a small accessory 

 branch in the middle of their length (fig. 9). The gono- 

 zooids themselves were more numerous, and also more 

 advanced than those observed by me; the largest being 

 as much as 4 M.m. long, and — what was of great in- 

 terest — containing in most of the specimens plainly de- 

 veloped generative elements. All the gonozooids on one 

 parent stem were always of one and the same sex. The 

 females are easily known by the greater transparency of 

 their manubrium, and by its pale rose color attributable 

 to the development of the ova. The males are recognis- 

 able by their opaque, in some reddish brown, in others 

 light yellow manubrium; the spermatozoides (flg. 22) de- 

 veloped in the walls of the manubrium are excessively 

 small, with an oval body and a not very long filiform tail; 

 they move very actively. 



The manubrium (b) is in fully developed male gono- 

 zooids (fig. 21—23) somewhat longer than in the female 

 gonozooids (fig. 10-12) and extends a little (fig. 21) 

 often even considerably (23) beyond the aperture of the um- 

 brella; while in the female gonozooids it reaches, at the 



