85 



Yentralfladen, den concave 

 temmelig tynd, 15 Mm. fra 

 vendt mod Dorsalfladen (Fig. 

 i Stilken næsten 8 Formen, 

 den nederste Bøining, og 27 

 svarer til Stilkens op svulme d 

 er blød og bøielig, bestaar 

 indsprængte Kalkkorn. 



til DorsalfLaden, og ender 



Stilkens Spidse i en Krog, 



6). Axen antager saaledes 



er 32 Mm. i Omkreds paa 



Mm. paa den Krumning, som 



e Del. Axens nederste Ende 



af fibrillært Bindevæv med 



Ved Axens Skede findes intet Særegent, uden at den 

 i den nederste Trediedel af Stilken bliver meget tyk, ja 

 endog indtil 3, 5 Mm. 



Axens Cuticula dannes af en hyalin elastisk Membran, 

 hvori sees en Mængde Ernæringskanaler og Kalkkorn. 



Efter hvad vi ovenfor have fremhævet, kan Slægten 

 Ptilella characteriseres saaledes: 



Meget store Søfjære med store, brede, halvmaanefor- 

 mige Finner, forsynede med flere Rækker Polypceller. 

 Ventralfladen nøgen. Zooiderne laterale, strækkende sig 

 henimod Dorsalfladens Midte. Paa Finnernes ventrale 

 Rand stærkt udviklede Zooider. Kjønsorganerne i Fin- 

 nerne. Paa Stilkens øverste Del en stor, kjødet Opsvul- 

 men. Axen tyk, rund, nedentil S formig bøiet, endende i 

 en Krog; oventil derimod ender den slyngeformig. 



Af de Exemplarer, der have staaet til vor Raadighed, 

 give vi nedenstaaende Maalinger i Millimeter: 



1. 2. 3. 4. 5. 6. 7. 



Stokkens Længde .... 250 250 465 600 660 740 780 



Fjærens Do 170 148 305 435 465 530 545 



Stilkens Do 80 102 160 165 195 210 235 



Finnernes Do 24 26 30 33 35 50 42 



Finnernes Bredde ved 



Basis 10 11 16 15 17 15 16 



Finnernes Antal paa hver 



Side 30 30 45 49 39 58 70 



Omkredsen af Stilkens 



opsvulmede Del . . . 50 55 110 95 113 155 120 



Cellernes Antal 48-50 50 80-85 90-96 85-90 90-100 80-90 



Do. Afstand 0,5 0,5 0,5 0,5 1 1 1 



Denne Søfjær synes at have en stor Udbredning ved 

 den norske Kyst. Sars angiver Ranenfjord i Nordland og 

 Herø paa Søndmør som de Steder, hvorfra de to Exem- 

 plarer, han havde til sin Beskrivelse, vare tagne. Af de 

 7 Exemplarer, vi have havt til Undersøgelse, er No. 1 

 fra Helgeland, No. 2 fra Lofoten (begge Steder tilhørende 

 Nordlands Amt), No. 3 Stavangerfjord, No. 4 Hardanger- 

 fjord, No. 5 og 7 Bergensfjord, No. 6 Christiansund. — 

 Dybden angives fra 150—200 Favne paa Dyndbund. Alle 

 ere opfiskede paa Liner. 



BESKRIVELSE OYER FIGURERNE. 



Tab. 11, Fig. 4. v Ventralkanal; d Dorsalkanal; v' den udvidede 

 Del af Ventralkanal en, som indeholder Axens bugtede Del 

 eller a Krumning. Sv. Sv den ved Snittet aabnede 

 venstre Sidekanal, i hvis blinde Del er indført Sonden r; 



then runs a little way almost perpendiculary, after which 

 it again forms a curve with the convex part towards the 

 ventral surface, and the concave part towards the dorsal 

 surface, terminating rather thin 15 Mm. from the point 

 of the stalk in a hook turned towards the dorsal surface 

 (fig. 6). The axis thus assumes nearly the form of S 

 in the stalk; it is 32 Mm. in circumference at the 

 lowest curve, and 27 Mm. at the curve which answers to 

 the swollen part of the stalk, The lower extremity of 

 the axis is soft and flexible, consisting of fibrillous con- 

 necting tissue with calcareous granules therein. 



In the sheath of the axis there is nothing peculiar, 

 excepting that in the lower third part of the stalk it 

 becomes very thick; even to 3,5 Mm. 



The cuticle of the axis is formed of a hyaline elastic 

 membrane, wherein appear a number of alimentary canals 

 and calcareous granules. 



According to what we have above stated, the genus 

 Ptilella may be characterised as follows: 



Very large sea-pens with large broad semilunar fins 

 bearing several rows of polyp-cells. The ventral surface 

 naked. The zooids lateral, exteading towards the centre 

 of the dorsal surface. On the ventral margin of the fins 

 strongly developed zooids. The sexual organs in the 

 fins. On the upper part of the stalk a large fleshy en- 

 largement. The axis thick, round, curved downwards in 

 the form of an S terminating in a hook, while in the 

 upper part it terminates in a volute. 



Of the specimens that have been at our disposal, we 

 give below the dimensions in Millimetres: 



1. 2. 3. 4. 5. 6. 7. 



Length of Polypary ... 250 250 465 600 660 740 780 



Do. of Feather .... 170 148 305 435 465 530 545 



Do. of Stalk 80 102 160 165 195 210 235 



Do. of Fins 24 26 30 33 35 50 42 



Breath of Fins at Base . 10 11 16 15 17 15 16 



Number of Fins on each 



side 30 30 45 49 39 58 70 



Circumference of enlar- 

 ged part of stalk . . 50 55 110 95 113 155 120 

 Number of cells ..... 48-50 50 80-85 90-95 85-90 90-100 80-90 



Distance of do 0,5 0,5 0,5 0,5 1 11 



This sea-pen seems to be extensively distributed on the 

 Norwegian coast. Sars indicates Kanenfjord in Nordland 

 and Herö in Sondmör as the places whence the two spe- 

 cimens which he had for his descriptions were taken. 

 Of the 7 specimens we have had for examination No. 1 

 is from Helgeland, No. 2 from Lofoten (both places in the 

 district of Nordland); No. 3 Stavangerfjord; No. 4 Har- 

 dangerfjord; No. 5 & 7 Bergensfjord; No. 6 Christian- 

 sund. — The depth is given at 150 & 200 fathoms on 

 miry bottom. All the specimens were taken on fisher- 

 men's lines. 



DESCRIPTION OF THE FIGURES. 



Tab. 11, fig. 4. v the ventral canal; d the dorsal canal; v 4 the 

 enlarged part of the ventral canal containing the sinuous 

 part of the axis, or a curve; Sv. Sv the left lateral 

 canal opened by the section, with the probe r inserted in 



12 



