92 



Favne, lerholdig Bund. Den var temmelig almindelig i 

 Varangerfj orden, ganske i Nærheden af Vadsø, Alle Ex- 

 emplarer vare mere eller mindre afbrækkede med Und- 

 tagelse af ét, der væsentlig har tjent os til Tegning og 

 Beskrivelse. 



Virgularia affinis characteriseres saaledes: 

 Polyp stokken lige, stiv, og paa dens øverste Ende er 

 Axen nøgen. Ventralfladen forsynet med en bred og dyb 

 Fure. Finnerne sidde afvexlende tæt sammen, ere høiest 

 mod Bugfladen og aftage successivt mod Midten af Dor- 

 salfladen, hvor de ende i en Spids. Omtrent den nederste 

 Halvdel af deres indre Væg er fastvoxet til Hachis. Cel- 

 lerne almindeligst 10, sammenvoxede efter deres hele 

 Høide (Længde). Zooider laterale i stor Mængde imellem 

 Finnerne, yderst sparsomme paa Rygsiden. 14 Par Finner 

 paa 50 Mm. af Rachis's Midtparti. 



FORKLARING OVER FIGURERNE. 



Tab. 4, Fig. 1. Virgularia affinis i naturlig Størrelse. ' a den ten- 

 formige Del; & den nøgne Axe. 



Fig. 2. Et Stykke af Rachis med Finner og Polyper, seet fra Ryg- 

 siden, — forstørret, a Finner; b Polyper; c Zooider. 



Fig. 3. Det øverste Stykke af Polypstokken med den nøgne Axe, 

 seet fra Rygsiden, — forstørret, a Finner; b Polyper; 

 c Zooider; d Serpulaer. 



Fig. 4. Et Stykke af Polypstokken, seet fra Siden, — forstørret. 

 a Finnen; b Polyper; c Zooider. 



Fig. 5. Et Stykke af Polypstokkens Bugside, — forstørret, a Fin- 

 ner; b Polyper; c Zooider. 



Fig. 6. Polyper og Celler, — forstørrede, a Celler; b Polyper; 

 c Tentakler. 



Fig. 7. Axen i naturlig Størrelse, a den tversafskaarne øverste 

 Ende; b den krogformige nederste Ende. 



SLÆGTEN BÜBENIA, Nob. ») 

 SLÆGTSCHARACTEREN. 

 Habitus nærmer sig Stylatula. Stilken forsynet med 

 Endeblære. Rachis har en temmelig lang, lateral Zooid- 

 stribe, samt radiære Kanaler, udgaaende saavel fra Dorsal- 

 som Ventralkanalen og dannende nærmest Finnen en 

 svag Vulst paa Dorsal- og Ventralfladen. Finnerne rudi- 

 mentære, støttes af en Kalkplade, sammensat af kortere 

 og længere Kalknaale, der rage langt op over den rudi- 

 mentære Finne. Polyperne uden Celle, lange, cylindriske, 

 der vanskelig sammentrække sig, men sammenvoxede ved 

 Grunddelen. Kjønsorganerne i de fuldtudviklede Poly- 

 pers hypogastriske Hule. Zooiderne laterale. Axen rund 

 med talrige radiære Fibre. 



NÆRMERE CHARACTERISTIK AF SLÆGTEN. 

 Stilken ender i en tydelig Blære, der er forsynet 

 med en Grube, som er omtr. et Par Mm. dyb, Rachis 



*) I vore foreløbige Meddelelser over Pennatuliderne (se Ma- 

 gazin for Naturvidenskaberne 1874) have vi benævnt en ny Slægt 

 Batea; men senere ere vi blevne opmærksomme paa, at dette Navn 

 allerede var optaget af Fritz Müller for en Crustacé-Slægt, hvorfor 

 vi nu have forandret det til Dübenia, og derved opkaldt vor Yen, 

 den fortidlig afdøde og dygtige Naturforsker, Magnus von Duben. 



60—100 fathoms on clayey bottom. It was rather abun- 

 dant in the Varangerfj ord, quite in the neighborhood of 

 Vadsö. All the specimens were more or less broken ex- 

 cepting one which has chiefly been used for our drawings 

 and description. 



Virgularia affinis is characterised as follows: 

 The polypary straight and stiff, having the axis at its 

 upper end bare. The ventral surface has a broad and deep 

 furrow. The fins are placed alternately, close together- 

 they are highest towards the ventral surface, and diminish 

 successively towards the dorsal surface, where they ter- 

 minate in a point. About the lower half of their interior 

 wall is connatef with the rachis. The cells usually 10 

 connate in their whole height (length), Zooids lateral 

 in great numbers between the fins, extremely rare on 

 the dorsal side; 14 pairs of fins in 50 Mm. of the middle 

 part of the rachis. 



EXPLANATION OF THE FIGURES. 

 Tab. 4, fig. 1. Virgularia affinis, natural size, a the fusiform part' 



b the bare axis. 

 Fig. 2. A piece of the rachis with fins and polyps seen from the 



dorsal side magnified, a fins; b polyps; c zooids. 

 Fig. 3. The upper part of the polypary with the bare axis viewed 



from the dorsal side, magnified, a fins; b polyps; c zooids; 



d serpulæ. 

 Fig. 4. A part of the polypary seen from the side, magnified. 



a fins; b polyps; c zooids. 

 Fig. 5. A part of the ventral side of the polypary magnified. 



a fins; b polyps; c zooids. 

 Fig. 6. Polyps and cells magnified, a cells; b polyps; c tentacles. 



Fig. 7. The axis, natural size, a the truncated upper extremity; 

 b the hook-shaped lower extremity. 



GENUS BÜBENIA, Nob. l ) 

 GENERIC CHARACTERS. 



The habitus has some resemblance to the Stylatula. 

 The stalk furnished with a terminal bladder. The rachis 

 has a rather long lateral band of zooids, and radial 

 canals issuing as well from the dorsal as from the ventral 

 canal, and forming close to the fins a slight swelling on 

 the dorsal and ventral surfaces. The fins are rudimen- 

 tary and supported by a calcareous plate composed of 

 shorter or longer calcareous needles, which project far 

 up beyond the rudimentary fin. The polyps without cells, 

 long, cylindrical and not easily contractile, connate at the 

 basal part. The sexual organs, in the hypogastric cavity 

 of the fully developed polyps. The zooids lateral. The 

 axis round with numerous radial fibres. 

 MORE PARTICULAR CHARACTERISTICS OF THE GENUS. 



The stalk ends in an evident bladder, which has a 

 depression about 2 Mm. deep. The rachis has a lateral 



l ) In our preliminary communications concerning the Penna- 

 tulidæ (Magazin for Naturvidenskaberne 1874) we have named a 

 new genus Batea; but we have subsequently become aware that 

 this name had been already taken up by Fritz Muller for a genus 

 of Crustaceæ; for which reason we have changed the name to 

 "Dübenia", thereby remembring our prematurely deceased friend, 

 the equally talented and amiable Naturalist Magnus von Düben, 



