52 



Duva violacea, n. sp. 



Tab. III. Fig. 30—52. 



Zoanthodemet er indtil 80" ?m høit. Stammen, der ved 

 Granden er 70 mm i Omkreds, deler sig omtrent 35 Wi * fra 

 Granden i to, hvoraf den ene er lidt tykkere end den 

 den anden, Fig. 30. Basaldelen er temmelig fast, lidt ud- 

 videt og meget furet; fra den udspringe et Par yderst 

 korte og tynde Grene, paa hvis Ender sidde nogle faa — 

 3 — 4 — Polyper. De nævnte to Stammer ere 45 mi " høie, 

 glatte, bløde, med temmelig fremtrædende Længdekanaler 

 og lige fra Granden forsynede med en Mængde bløde, 

 meget bøielige Grene, der dele sig i mange Smaagrene, 

 som igjen forgrene sig i flere tynde Stilke, der hver bærer 

 fra 3 — 6 Polyper. Smaagrenene ligesom Stilkene ere runde, 

 glatte, glindsencle og halv gjennemsigtige, Fig 30. 



Polypeme ere cylindriske, Fig. 31. noget bredere mod 

 Mundskiven, der er lidt hvælvet. Paa Polypkroppens 

 Rygside sees 6 Rækker Spikier, der indtage Kroppens 

 hele Længde og strække sig op til Grunden af Tentaklerne ; 

 i hver Række er der 3—4 Spikier i Bredden, Fig. 32. 

 Paa Bugsiden er der kun 2 Rækker, og disse ere meget 

 korte, idet de afbrydes af et paa Midten af Kroppen paa- 

 tversgaaende Spikelbelte; ovenfor dette Belte er saaledes 

 Bugsiden delt i 3 nøgne Felter, hvoraf det Midterste ei- 

 det største; under Beltet er hele Fladen fri for Spilder, 

 Fig. 33. Tentaklerne ere tykke, forsynede med Pinnuler 

 og uden Spikier. I Regelen er dels 2, dels 3 Polyper 

 sammen voxede ved Grunden, Fig. 32, og kun sjeldent sees 

 en enkelt Polyp at gaa umiddelbart over i Stilken; hvor 

 dette er Tilfældet, er altid denne enkelte Polyp længere, 

 idet nemlig Bagkroppen er noget forlænget. 



Kjønsprodukterne ud vikle sig ikke alene i den bagerste 

 Del af Mavehulheden, men ogsaa i dennes Forlængelse i 

 Stilken, hvor Æggene stundom ligge pakkede og give den 

 Udseende af en Perlesnor. Kun paa 2 af Septula udvikle 

 Kjønsorganerne sig. 



Basaldelen er det eneste Parti af Stammen og Gre- 

 nene, der er forsynet med Spilder. De ligge temmelig tæt 

 i det ydre Bindevævslag, dækket af Ectodermet og have 

 forskjellige Former. De hyppigste ere dog simple Dobbelt- 

 stjerner, dels med et nøgent, smalt Midtparti og vorte- 

 dannede Takker paa Enderne, Fig. 34. 35. 36, dels med 

 et Midtparti, der er besat med yderst smaa Takker; de ere 

 fra 0.060— 0.100""" lange og fra 0.012—0.016""" brede paa 

 Midten. Foruden disse Dobbeltstjerner findes enkelte Køller, 

 der ere takkede i den tykke Ende med et tilrundet, næsten 



Duva violacea, n. sp. 



Pl. III. Figs. 30—52. 



The Zoanthodem measures up to 80 ! T in height. 

 The stem, which at the base measures 70 mm in circum- 

 ference, ramifies, at about 35""* beyond the base, into 

 two parts, of which, the one is a little thicker than the 

 other (fig. 30). The basal part is pretty firm, a little 

 dilated, and much grooved, and from it, there shoot out a 

 couple of extremely short and thin branches, on whose 

 extremities a few, 3—4, polyps are situated. The two 

 stems mentioned, measure 45 OTm in height and are smooth 

 and soft; they have rather prominent longitudinal ducts and, 

 quite from their base, are furnished with a multitude of 

 soft, very flexible branches which ramify into numerous 

 branchlets, which, again, ramify into several thin stalks, 

 each of which carries 3 — 6 polyps. The branchlets, as 

 well as the stalks, are cylindrical, smooth, and shining, 

 and are semitransparent (fig. 30). 



The polyps are cylindrical (fig. 31), somewhat broad- 

 est toAvards the oral disk, which is a little arcuated. On 

 the dorsal side of the body of the polyp, 6 series of spi- 

 cules are seen; these occupy the entire length of the body 

 and extend themselves up to the root of the tentacles; in 

 each series, there are 3 — 4 spicules in the breadth (fig. 32). 

 On the ventral side, there are only two series, and these 

 are very short, because they are interrupted by a spicular 

 belt running transversally across the middle of the body. 

 Above this belt, the ventral side is, consequently, divided 

 into 3 bare areas, of which the mesial one is the largest; 

 below the belt the entire surface is devoid of spicules 

 (fig. 33)- The tentacles are thick, furnished with pinnules, 

 and devoid of spicules. As a rule, sometimes 2, and some- 

 times 3, polyps are concreted together at the base (fig. 32), 

 and, only rarely is an occasional polyp seen to be pro- 

 duced immediately into the stalk. "Where that is the case, 

 this occasional polyp is always longer than the others, 

 owing to its posterior body being somewhat prolonged. 



The sexual products develope themselves, not only 

 in the posterior part of the ventral cavity, but also in its 

 prolongation into the stalk, where, the ova, now and then, 

 lie crowded, and impart to -it the appearance of a string 

 of pearls. Upon 2 of the septula only do the sexual 

 organs develope themselves. 



The basal part is the only part of the stem and 

 the branches that is furnished with spicules. They are 

 placed, pretty close, in the exterior layer of connective-tissue, 

 are covered by the ectoderm, and possess varying forms. 

 The most frequent forms are, however, plain bistellates, partly, 

 having a bare narrow mesial part and wart-shaped spikes 

 on the extremities (figs. 34. 35. 36); partly, having a me- 

 sial part beset Avith extremely minute spikes; they measure, 

 from 0.C60— 0.100""" in length, and from 0.012—0.016""" 

 in breadth at the middle. Besides these bistellates, a 



