83 



P. borealis, Herklots. Not, pour servir å l'étude des polypiers 

 nageurs ou pennatulides. Pag, 17. 



P. borealis, Gray. Ann. and Magazine Natur. Hist. 1860. 

 Pag. 22. 



P. borealis, Eichiardi. Monograf. d. fam. dei pennatularii. 

 Pag. 31, Tab. 2, Fig. 15, 16, 17. 



P. Borealis, Kölliker. Anat.-systemat. Beschreibung der Al- 

 cyonarien. lste Ab theilung. Die Pennatuliden. Pag. 136. 



Ptilella borealis, Gray. Catalogue of Sea-Pens or pennatu- 

 lariidæ. Pag. 21. 



Til de af Sars og Kölliker givne Beskrivelser over 

 denne skjønne Søfjær, skulle vi tilføie Følgende: 



Ventralfladen er bred og nøgen. Zooiderne indtage 

 ikke alene Lateralfladen, men strække sig i stor Mængde 

 langs den øverste Side af Finnen over paa Dorsalfladen, 

 hvor de henimod dennes Midte ende i 3 stundom 4 

 Rækker, hvoraf den 4de er den mindste. Omtrent to 

 Trediedele af Finnens Ventralrand ere optagne af stærkt 

 udviklede Zooider. Af Lateralzooiderne udmærke især 

 nogle sig ved deres Størrelse, og disse have sædvanligen 

 sit Sæde to ved hver Bladbasis, og ikke som Kölliker og 

 tildels Sars siger „1 mellem hvert Blad." 



Finnens Dorsalrand, der er Sars's convexe, er besat 

 med fra 2 — 4 Rader Celler, der, som Sars rigtig udtryk- 

 ker sig, staa mere paatvers end paalangs af Finnen. 



Polyperne ere uden Spicier, hvorimod Cellerne ere 

 rigt udstyrede dermed. 



Kølliker betvivler Rigtigheden af de af Sars beskrevne 

 røde Vorter paa Stilken, og antager dem for Længdefol- 

 der, der sandsynligvis ere fremkomne først ved Døden; 

 men Sars har aabenbar Ret; thi foruden at vi paa mange 

 Exemplarer have iagttaget baade Længde- og Tverfolder 

 paa det nævnte Sted, have vi tillige seet, at de omtalte 

 Vorter have siddet tildels paa selve Folderne, tildels 

 mellem dem. De af Sars beskrevne Appendices paa den 

 øverste Spidse af Rachis ere kun endnu ikke fuldt ud- 

 viklede Blade (Finner); thi paa meget store Exemplarer 

 have vi observeret, at disse af ham beskrevne Lapper ere 

 udvoxede til fuldkomne Finner, forsynede med Polyper, 

 dog saaledes, at selve Finnens Basis endnu bærer Spor 

 af dets lappede Oprindelse. Sars har ogsaa virkelig 

 været inde paa den Tanke, at disse Appendices kunde 

 være fremvoxende Finner; men hans Tvivl var dog saa 

 stærk, at han igjen frafaldt den, og antog dem for sær- 

 egne Organer. 



Hvad nu den indre Bygning angaar, saa omtaler Sars 

 kun Axen, og det paa en temmelig ufuldstændig Maade. 



liker og Eichiardi, have bragt det til fuld Sikkerhed, at Sars's 

 borealis er Ehrenbergs „grandis". Selv Sars sees i sin Beskrivelse 

 overP. borealis at have været i Tvivl om, hvorvidt disse to Søfjære vare 

 identiske; og Milne-Edwards nærer den samme Tvivl; men da in- 

 gen af disse Naturforskere havde seet Ehrenbergs Originalexemplar 

 i Berlinermuseet, forblev Sars's Art i lange Tider staaende som en 

 fra „grandis" forskj eilig, indtil endelig Kölliker ved selvstændige 

 Undersøgelser og Sammenligninger af Originalexemplarerne kom til 

 det sikkre Resultat, at „borealis" og „grandis" var den samme Art. 

 Da nu Ehrenbergs Navn er det ældste, finde vi det rigtigst at op- 

 tage dette» 



P. borealis, Herklots. Not. pour servir å l'étude des polypiers 

 nageurs ou pennatulides, pag. 17. 



P. borealis, Gray. Ann. and Magazin Natur. Hist. I860, 

 pag. 22. 



P. borealis, Richiardi. Monograf. d. fam. dei pennatularii, 

 pag. 31, tab. 2, fig. 15, 16, 17. 



P. borealis, Kölliker. Anat.-systemat. Beschreibung der A1-. 

 cyonarien. lste Abtheilung. Die Pennatuliden. Pag. 136. 



Ptilella borealis, Gray. Catalogue of Sea-Pens or pennatula- 

 riidæ. Pag. 21. 



To the descriptions given by Sars and Kölliker of 

 this beautiful Sea-Pen we will add the following. 



The ventral surface is broad and naked. The Zooides 

 occupy not only the lateral surface, but extend in great 

 numbers along the upper side of the fin (pinna) on to 

 the dorsal surface, towards the middle of which they 

 terminate in 3, sometimes 4 rows, whereof the 4th is the 

 smallest. About two thirds of the ventral margin is 

 occupied by strongly developed zooides. Of the lateral 

 zooides, some are especially remarkable for their size, and 

 are moreover usually situated two at each leaf-base; not as 

 Kölliker and (occasionally) Sars say "1 between each leaf". 



The dorsal margin of the fin, which is Sars' convex, 

 bears 2 — 4 rows of cells which, as Sars correctly expres- 

 ses it, are situaded more across than along the fin. 



The Polyps are without spicula, while the cells have 

 them in abundance. 



Kölliker doubts the accuracy of Sars 5 description of 

 the red warts on the stalk, and supposes them to be longi- 

 tudinal folds which have probably been produced by 

 death; but Sars is evidently right; for we have in many 

 specimens seen both longitudinal and transverse folds 

 in the places mentioned, and moreover we have also seen 

 the warts situated partly on the folds and partly between 

 them. The appendages described by Sars on the supe- 

 rior point of the Eachis, are only imperfectly developed 

 leaves (fins); for in very large specimens we have obser- 

 ved these lobes described by him developed into com- 

 plete fins bearing Polyps, while the base of the fin itself 

 still bore traces of its originally lobed form. Sars had 

 also really entertained the notion that these appendages 

 might be nascent fins; but his doubt was still so strong 

 that he abandoned the notion and supposed them to be 

 particular organs. 



Now as to the interior structure, Sars mentions only 

 the axis, and that rather incompletely. II is probable 



I 



liker and Eichiardi, have established beyond a doubt that Sars* 

 borealis is Ehrenberg's „grandis". Sars himself in his description 

 of P. borealis seems to have been in doubt as to the identity 

 of these two Sea-Pens; and Milne Edwards entertains the same 

 doubt, but as neither of these naturalists had seen Ehrenberg's ori- 

 ginal specimen in the Berlin Museum, Sars' species continued for 

 a long time to be considered as distinct from „grandis" until at 

 last Kölliker, by independent investigation and comparison of the 

 original specimens, came to the positive result that „borealis" and 

 „grandis" are one and the same species. As Ehrenberg's name i& 

 the oldest, we feel bound to adopt it. 



