101 



SLÆGTSCHARACTER. 



Stokken liden, stiv. Cellerne adskilte, siddende paa 

 Rachis i afvexlende Rækker, forsynede med 8 Længde- 

 ribber, samt 8 Papiller omkring Aabningen. Polyperne 

 robuste, retractile. Zooiderne ventrale. Ingen Kalk hver- 

 ken i Polyper, Celler eller Sarcosomaet. 



CLÅD1SCUS GRACILIS, Nob. 

 (Tab. 9, Fig. 13-15). 



Stokken liden, tynd og stiv, næsten rund, maaske 

 lidt fladtrykt paa Ventralfladen, og i Spidsen blottet for 

 Sarcosoma i en Strækning af 1 Mm. Cellerne sidde i 

 spredte, afvexlende Rækker 3 og 3 paa hver Side af Stok- 

 ken, og strække sig over til Dorsalfladen, hvor de paa 

 den midterste Del af Rachis dække ganske denne, der 

 forøvrigt er nøgen. Cellerne ere krukkeformige, 2 Mm. 

 lange, adskilte lige til Sarcosomaet, hvor de ere smalest; 

 de have 8 Længderibber, imellem hver en hvid glindsende 

 Stribe; Aabningen rund, vid, forsynet med 8 temmelig 

 store, bløde Papiller. Afstanden mellem Celleraderne er 

 5 Mm. Paa hver Side af Rachis 21 Cellerader, saa der 

 paa den hele Stok var 126 Celler. 



Polyperne ere retractile, cylindriske, temmelig lange, 

 forsynede med tykke i Spidsen afstumpede Tentakler, der 

 paa hver Side have 10 — 12 tykke Traade. Hverken i 

 Polyperne eller Cellerne findes Spor af Kalk. Sarcoso- 

 maet er ligeledes kalkfrit, meget gjennemskinnende, tyndt 

 især paa Dorsalfladen, saa at Axen sees meget tydeligt. 

 Paa Ventralfladen, der er lidt flad og forsynet med en 

 svag Midtfure, der er nøgen, sees paa hver Side en Række 

 spredte Zooider, der paa det Sted, som findes mellem hver 

 Gruppe Celler, trænge sig mere sammen, blive større og 

 danne stærke Ventralvulster, der have et ganske eien- 

 dommeligt, ligesom crenuleret Udseende, idet nemlig Zooi- 

 derne, som ere meget langstrakte, ligge næsten viftefor- 

 migt ordnede i Vulsten (Fig. 15 a). I hver Vulst er fra 

 20—25 Zooider. 



Farven: Gulhvid, omtrent som Virg. mirabilis. 



Findested: Slotholmen (Lofoten) paa dyndet Lerbund, 

 40 Favne. 



Cladiscus gracilis kan characteriseres saaledes: 

 Stokken liden, tynd og stiv. Rachis 70 Mm. Cel- 

 lerne krukkeformige, siddende 3 i hver Række afvexlende 

 paa Stokken. Farven bleggul. 



FORKLARING OVER FIGURERNE. 



Tab. 9, Fig. 13. Cladiscus gracilis, naturlig Størrelse, seet fra 

 Ryggen. 



Fig. 14. Et Stykke af samme, lidt forstørret. 



Fig. 15. Et Stykke stærkt forstørret, fra Bugsiden, a, a Zooider; 

 h f b de krukkeformige Celler, forsynede med sine Længde- 

 ribber og sine 8 Papiller; c, c Polyper. 



GENERIC CHARACTERS. 

 The polypary small and rigid. The cells situated 

 separately on the rachis in alternating rows with 8 longi- 

 tudinal ribs, and 8 papillæ round the aperture. The 

 polyps stout and retractile. The zooids ventral. No 

 calcareous matter in the polyps, cells or sarcosoma. 



CLADISCUS GRACILIS, Nob. 

 (Tab. 9, fig. 13—15). 



The polypary small, thin and rigid, nearly round, per- 

 haps a little flattened on the ventral surface, and at the 

 point denuded of sarcosoma to an extent of 1 Mm. The 

 cells are situated in dispersed alternating rows 3 and 3 on 

 each side of the polypary, and extend to the dorsal sur- 

 face, which in the middle part of the rachis they entirely 

 cover, and which otherwise is bare. The cells are urn- 

 shaped, 2 Mm. long, separated even to the sarcosoma, 

 where they are narrowest; they have 8 longitudinal ribs, 

 and between each two a white shining stripe. The aper- 

 ture is round and wide, furnished with 8 rather large soft 

 papillæ. The distance between the rows of cells is 

 5 Mm. On each side of the rachis 21 rows of cells, so 

 that on the whole polypary there were 126 cells. 



The polyps are retractile, cylindrical, rather long, having 

 thick tentacles truncated obtusely at the extremity, with 

 10—12 thick filaments. Neither in the polypsnor in the 

 cells, is there any trace of calcareous matter; and the 

 sarcosoma is likewise free from the same, very trans- 

 parent and thin, especially on the dorsal surface, so that 

 the axis is very plainly seen. On the. ventral surface, 

 which is a little flat and has a slight medial furrow which 

 is bare, there appears a series of scattered zooids, which 

 in the spaces between the groups of cells are more ag- 

 glomerated, become larger, and form strong ventral pro- 

 tuberances of a very peculiar, as it were, crenulated ap- 

 pearance; the zooids, which are very much elongated, 

 lying in the protuberances nearly in fan-like arrangement 

 (fig. 15 a). In each protuberance there are from 20 to 

 25 zooids. 



The color is yellowish white, about like that of Virg. 

 mirabilis. 



It is found at Slotholmen (Lofoten) on miry clay 

 bottom at the depth of 40 fathoms. 



Cladiscus gracilis may be thus characterised: 



The polypary small, thin and rigid. The rachis 70 Mm, 

 The cells urn-formed, situated 3 in each row, alternating 

 on the trunk. Color pale yellow. 



EXPLANATION OF THE FIGURES. 



Tab. 9, fig. 13. Cladiscus gracilis, natural size, seen from the 



dorsal side. 

 Fig. 14. A part of the same, slightly magnified. 

 Fig. 15. A part strongly magnified, seen from the ventral side. 



a, a zooids; b, b the jar-formed cells with their longitudinal 



ribs and their 8 papillæ; c, c polyps. 



14 



