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phonophorer, hvilke forekom mig at være to forskj eilige 

 Arter henhørende til Slægten Physophora, Forskål, og bleve 

 med en kort Diognose anførte i min Beiseberetning (Nyt 

 Magazin for Naturvidenskaberne, Christiania 1850, B. 6, 

 pag. 158—159)» Slægten Physophora var den Tid kun 

 meget ufuldstændigt bekjendt, nemlig alene af de ældre 

 mangelfulde Beskrivelser af Forskål og Péron. Først nogle 

 Aar derefter lærte jeg ved egen Iagttagelse (se mine „Bi- 

 drag til Middelhavets Littoralfauna" 1857, Hefte 2, pag. 

 60) at kjende den typiske Art, den i Middelhavet ikke 

 sjeldne Physophora hydrostatica, Forskål, som i de senere 

 Aar ogsaa er bleven fuldstændigen undersøgt af Rølliker, 

 Gegenbaur og Claus. 



I det største af de tvende fundne Exemplarer, efter 

 hvilket jeg opstillede min P glandifera, havde jeg tidligere 

 troet at se en ganske eiendommelig Art, afvigende fra de 

 øvrige ved Mangelen af de skrueformige, af en Kapsel 

 omhyllede Nesselknopper paa Fangtraadene, hvilke ud- 

 springe fra Basis af de saakaldte Sugerør eller polypag- 

 tige Maver, som ogsaa her syntes at være ganske ualmin- 

 delig smaa. Istedetfor hine Fangtraade fandtes udenfor 

 eller ovenfor og i en temmelig lang Afstand fra de for- 

 mentlige Sugerør en til disse svarende Kad af tynde, cy- 

 lindriske, extensible og retractile, simple eller ugrenede 

 Traade, hvis indre Del var besat med talrige Kjønskapsler, 

 medens den ydre Del var svagt zigzagformig bugtet, og i 

 hver Udbugtning viste en meget liden fremragende rund- 

 agtig eller kort-cylindrisk Knude. Jeg blev saaledes for- 

 ledet til at antage disse Traade for de egentlige Fang- 

 traade og de alternerende smaa Knuder paa deres ydre 

 Del for Sugevorter. 



Det andet mindre Exemplar, min P. vesiculosa, sva- 

 rede derimod ganske til Charactererne for Slægten Physo- 

 phora: det havde vel udviklede, store Sugerør eller po- 

 lypagtige Maver, fra hvis Basis der udgik en lang Fang- 

 traad, besat med Sidetraade, hvilke endte hver i en skrue- 

 formig oprullet og af en kapselformig Kappe indesluttet 

 Nesselknop. Ved den senere anstillede omhyggeligere 

 Undersøgelse fandtes dog ogsaa her de ovenomtalte sim- 

 ple, i deres ydre Del med smaa Knuder besatte Traade, 

 hvilke jeg tidligere ikke havde bemærket, da de vare 

 stærkt contraherede og ganske skjulte mellem Kjønsknop- 

 perne. 



Da jeg nu imidlertid ved egne Iagttagelser havde lært 

 at kjende den middelhavske P. hydrostatica, Forskål, an- 

 stillede jeg en fornyet Undersøgelse af mine ved Bodø 

 fundne og i Spiritus ret godt conserverede Exemplarer, 

 hvorved det viste sig, at de tvende formentlige Arter (P. 

 glandifera og P. vesiculosa) i Virkeligheden høre sammen 

 og danne en eneste, fra P. hydrostatica vel adskilt Art, 

 som jeg, istedetfor de tidligere foreslaaede kun lidet be- 

 tegnende Navne, har kaldt Physophora borealis. 



Hvad nemlig for det første Sugerørene betræffer, da 

 maa jeg antage, at de, med Undtagelse af et (Tab. 3, Fig, 

 1—4, a) af betydelig Størrelse (hvilket jeg tidligere feil- 



Bodo; these appeared to me to be of two different species 

 belonging to the genus Physophora Forskål, and were with 

 a short diagnosis mentioned in the report of my journey 

 (Nyt Magazin for Naturvidenskaberne, Christiania 1850' 

 Vol. 6, pag. 158—159). The genus Physophora was at that 

 time very imperfectly known and indeed only known through 

 the older incomplete descriptions of Forskål and Péron, 

 It was not until some years afterwards that I became by my 

 own observation (see my ''Bidrag til Middelhavets Littoral 

 fauna, 1857, Hefte 2, p. 60) acquainted with the typical 

 species Physophora hydrostatica Forskål, not uncommon 

 in the Mediterranean, which in the course of the last few 

 years has been completely investigated by Kölliker, Gegen- 

 bauer and Claus. 



I had previously regarded the largest of the two speci- 

 mens found as an entirely peculiar species (P. glandifera), 

 differing from the others in the absence of the spiral in- 

 cysted urticary knobs on the tentacular filaments proceed- 

 ing from the base of the so-called suction-tubes or polyp- 

 like stomachs, which also here seem to be quite unusually 

 small. Instead of this sort of tentacles there were, outside 

 or above and at some distance from the supposed suction- 

 tubes, a corresponding row of the thin cylindrical exten- 

 sible and retractile, simple or unramified filaments, the in- 

 terior part of which was covered with numerous sexual 

 capsules, while the exterior part was slightly sinuous or 

 zigzagged, shewing in each sinuosity a very small promi- 

 nent roundish or shortly-cylindrical tubercle. I was there- 

 fore misled to consider these filaments as the proper ten- 

 tacles, and the alternating small tubercles on their exterior 

 part as suckers. 



The other smaller specimen, my P. vesiculosa answered 

 on the contrary entirely to the characters of the Physo- 

 phora: it had well developed large suction-tubes or polyp- 

 like stomachs, from the base of which issued a long ten- 

 tacular filament covered with lateral threads each ending 

 in a spirally coiled urticary knob enclosed in a capsular 

 mantle. On subsequent more minute observation there ap- 

 peared also the above-mentioned simple filaments with the 

 small tubercles on their exterior part, which I had not pre- 

 viously remarked, as they were strongly contracted and 

 quite hidden among the sexual buds. 



As however I had now by my own observation become 

 acquainted with the Mediterranean P. hydrostatica For- 

 skål, I instituted a new scrutiny of my specimens found at 

 Bodø which had been very well preserved in spirit, and 

 became thereby convinced that the presumed two species 

 (P. glandifera and P. vesiculosa) really belong together and 

 form a single species (quite distinct from P. hydrostatica) 

 which I have called Physophora borealis instead of the not 

 very significative name formerly proposed. 



In the first place, with respect to the suction-tubes 

 I must presume that with exception of one (Tab. 3, fig. 1-4, 

 a) of considerable size (which I had previously mista ke 



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