88 



Baade Whiteaves og Verrill ere enige deri, at aculeata er 

 en fra phosphorea distinct Art. 



Den kan characterises s saaledes: Stokkens Ventral- 

 fiade forsynet med 4—6 Rader stærkt udviklede Zooider 

 i Form af Pigge, hvoraf de yderst stillede ere de største. 

 Bladene staa vidt fra hverandre, ere brede ved Basis og 

 bære lange Celler. 



Udmaalinger i Millimeter af forskjellige Exempl.: 



A. B. C. D. 



Stokkens Længde 175 125 75 53 



Hachis' do 109 79 44 30 



Stilkens do. ...... 66 46 31 23 



Bladenes do 25 20 11 7 



— Bredde ved Basis .5 4,5 3 1 



— Antal 31 27 19 11 



Polypernes Antal ...... 11 11 7 5 



FORKLARING OVER FIGURERNE. 



Tab, 11, Fig. 8. Pennatula aculeata, naturlig Størrelse, seet fra 



Bugsiden. 

 Fig, 9, Samme fra Rygsiden. 



PENNATULA ACULEATA VAB1ET. BOSEA, Nob. 



Stokken 72 Mm. lang. Kachis 45 Mm., paa Midten 

 3 Mm, bred. Stilken 27 Mm., dens nederste Ende næsten 

 kølleformig. Ventralfladen har paa Midten en Længde- 

 fure, der er nøgen, og paa hvis begge Sider findes en 

 stor Mængde Zooider, som danne temmelig fremragende 

 tilspidsede Papiller, der staa saa tæt sammen, at hele 

 Hachis paa dette Sted faar et taglagt Udseende. Zooi- 

 derne næsten hvide; de yderste, altsaa de nærmest Bla- 

 dene, ere størst. 



Dorsalfladen har ligeledes en Længdefure, og her 

 staa Zooiderne paa den nederste Del af Rachis i 1, 

 paa Midten i 2, fra Midten og op til Spidsen i 3 Rækker, 

 der dog afbrydes ved Bladinsertionerne, Zooiderne 

 næsten hvide. 



Bladenes Antal 19. Længden 11 Mm. og deres Bredde 

 ved Basis 3, 5 Mm. 



Polypernes Antal 8. Cellerne temmelig lange, hvide 

 paa deres øverste Del og forsynede i Randen med 8 hvide 

 lange Spieler. Polyperne hvide med et svagt rødligt 

 Skjær, og Tentaklerne, ligesom deres Traade, forsynede 

 med en Rad rosenrøde Spieler. 1 ) Stilkens Farve er svag 

 gulrødlig, den øvrige Del af Søfjæren fin rosenrød. 



Denne Varietet adskiller sig fra den egentlige acule- 

 ata væsentlig ved følgende: 1. Den har en robustere Byg- 

 ning. 2. Zooiderne paa Ventralfladen staa tættere og 

 opnaa langtfra den Længde, som Piggene paa aculeata; 

 paa Dorsalfladen derimod danne de flere Rader og ere 

 større. 3. Bladene staa tættere, ere flere i Antal, bredere 

 og kortere, og bære flere Polyper. 4. Cellernes øverste 



*) Hos et ligestort Exemplar af aculeata var Bladenes Antal 

 16; deres Længde 12 Mm. og Bredden ved Basis 2 Mm. Polyper- 

 nes Antal 5. 



Both Whiteaves and Verrill agree that aculeata is a spe- 

 cies distinct from phosphorea. 



It may be characterised thus: The ventral surface 

 of the polypary bearing 4 — 6 rows of strongly developed 

 zooids in the from of spines, of which the outermost 

 are the largest. The leaves standing far from each other 

 are broad at the base and bear long cells. 



Measurements in Millimetres of different specimens. 



A. B. C. D. 



Length of Polypary 175 125 75 53 



Do. - Rachis 109 79 44 30 



Do. - Stalk 66 46 31 23 



Do. - Leaves 25 20 11 7 



Breadth - Do. at base . . 5 4,5 3 1 



Number - Do 31 27 19 11 



Number - polyps 11 11 7 5 



EXPLANATION OF THE FIGURES. 



Tab. 11, fig. 8. Pennatula aculeata, natural size, seen from the- 



ventral side. 

 Fig. 9. The same from the dorsal side. 



PENNATULA ACULEATA VAB1ET BOSEA, Nob. 



The polypary 72 Mm. long. Rachis 45 Mm., in the 

 middle 3 Mm. broad. The stalk 27 Mm. its lower end 

 nearly club-shaped. The ventral surface has in the middle 

 a longitudinal furrow, which is naked, and on both sides 

 of which there are^ a great number of zooids forming 

 rather prominent pointed papillæ, so close together that 

 the whole rachis has in this part an imbricated ap- 

 pearance. The zooids nearly white; the outermost ones, 

 or those nearest the leaves, largest. 



The dorsal surface has also a longitudinal furrow; 

 and here the zooids are situated on the lower part of 

 the rachis in 1, in the middle in 2, from the middle and 

 up to the point in 3 rows, which are however interrupted 

 by the insertions of the leaves. The zooids nearly white. 



The number of the leaves 19; the length 11 Mm. 

 and their breadth at the base 3,5 Mm. 



The number of the polyps 8; the cells rather long r 

 white on their upper part with 8 long white spicula in 

 the margin. The polyps white, with a slight reddish 

 tint, and the tentacles as also their filaments, furnished 

 with a row of rose-red spicula 1 ). The color of the stalk 

 is pale yellowish-red; the other part of the sea-pen, 

 fine rose-red. 



This variety differs from the proper aculeata chiefly: 

 1. by its having a more robust structure; 2. by the 

 zooids on the ventral surface standing closer together 

 and not attaining to nearly the length of the spines of 

 the aculeata; while on the dorsal surface they form more 

 rows and are larger; 3. by the leaves standing closer 

 together, being more numerous, broader and shorter 



*) In a specimen of aculeata of similar size, the number of 

 leaves was 16; their length 12 Mm. and breadth at the base % Mm. 

 The number of polyps 5. 



