52 



Duva violacea. n. sp. 



Tab. III. Fig. 30—52. 



Zoanthodemet er incltil 80"" a hoit. Stammen, der ved 

 Granden er 70""" i Omkreds, deler sig omtrent 35""" 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""" hoie, 

 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, glindsende og halv gjennemsigtige, Fig 30. 



Polyperne ere eylindriske, Fig. 31, noget bredere mnd 

 Mundskiven, der er lidt hvælvet. Paa Polypkroppens 

 Rygside sees 6 Rækker Spikler, der indtage Kroppens 

 hele Længde og strække sig op til Granden af Tentaklerne; 

 i liver Række er der 3 — 4 Spikler i Bredden, Fig. 32. 

 Paa Bugsiden er der kun 2 Rækker, 



og disse ere meget 



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

 tversgaaende Spikelbelte; ovenfor dette Belte er saaledes 

 Bugsiden delt i 3 nogne Felter, hvoraf det Midterste er 

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

 Fig. 33. Tentaklerne ere tykke, forsynede med Pinnuler 

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

 sammenvoxede ved Granden, 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 forhenget. 



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 at Stammen og Gre- 

 nene, der er forsynet med Spikler. 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 nogent, 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. Fortiden disse Dobbeltstjerner rindes enkelte Koller, 

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



Duva violacea. n. sp. 



Pl. III. Figs. 30- v 1 . 



The Zbanthodem measures up to 80""" in height. 

 The stem. which at the base measures 70'""' in circum- 

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

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

 other (fig. 3<M- The basal part is pretty tinn, a little 

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

 eouple of extremely short and thin branches, on whose 

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

 stems mentioned, measure 45""" in height and are smooth 

 and soft; they have rather prominent longitudinal ducts and. 

 quite from their base', are furnished with a multitude of 

 sutt. very rlexible branches which ramify into numerous 

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

 each in' which carries 3 — (i 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 towards the oral disk, which is a little arcuated. On 

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

 ddes are seen i these occupy the entire length ol the body 

 and extend themselves up to the root oi' 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. 

 Almve 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 

 i ti-. 3.'!)- The tentacles are thick, furnished with pinnules, 

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

 tinies 3, polyps are concreted together at the base < tiu'- 32), 

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

 duced immediately into the stalk. Wliere that is the case, 

 this occasional polyp is alwavs 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 ot 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 fonns. 

 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 with 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 



