36 



hvor Polyperne fortrinsvis sidde. Polypcellerne runde, staa 

 tæt i hverandre og forsynede med 8 adskilte, spikelrige 

 Længderibber, hvorimellem en smal, nøgen Fure, der op 

 imod Cellens Rand udvider sig til et triangulært Rum. 

 Polyperne 5 — 6 mm lange, cylindriske, udvidende sig trakt- 

 formigt imod Tentakelskiven, hvor der åndes 8 trekantede, 

 nogne Felter, rigt besatte med Nematocyster. Tentaklerne 

 halv saa lange som Kroppen, forsynede med Spilder paa den 

 aborale Flade. Pinnulerne uden Spikier; saavel paa disse 

 som paa Tentaklernes adorale Side samt paa Mundskiven 

 en Mængde Nematocyster. Paa Easaldelen væsentligst 

 Dobbeltstjerner ; paa Stammen fornemmelig sammensatte 

 Stjerner og særegne brede, rigt ornamenterede Spikier; 

 paa. Polypeellen elliptiske Spindler, Dobbeltstjerner og eien- 

 dommelige Firlinger; paa Polypkroppen hovedsagelig lange, 

 dels kramme, dels lige, takkede Spindler; saa godt som 

 overalt ere Spiklerne ligesom overstrøede med fine Kalk- 

 korn ; paa Svælget to Rækker spredte, flade, uregelmæssige 

 Spilder. Farven gul. 



I et tidligere Arbeide ! af J. Koren og mig er op- 

 stillet Slægten Duva og karakteriseret saaledes : 



"Zoanthodemet trædannet, stærkt forgrenet. Stammens 

 Basaldel bred. Hovedgrenene lange, bløde, bøielige, enten 

 dele sig i Smaagrene, disse i flere Stilke, der hver 

 bærer paa deres Ender flere Polyper, eller forblive udelte, 

 men ogsaa da bære paa Enden en Samling af Polyper, 

 hvilke dels ere sammenvoxede ved Grunden, dels skilte ved 

 et smalt Coenenchym. Polyperne ikke retraktile, korte, 

 men vel udviklede, forsynede med lange, spindelformede, 

 takkede Spilder. Grenene og Smaagrenene uden Kalk. 

 Spiklerne i Stammen dels mangestraalecle, korte Spindler, 

 dels simple Dobbeltstjerner, ikke synbare for blotte Øie. 

 Septa uden Kalk." 



Senere Undersøgelser have gjort det nødvendigt at 

 foretage nogen Forandring ved denne Karakteristik. 

 Der er nemlig fundet paa den norske Nordhavsexpedition 

 ikke mindre end 8 nye Arter, som jeg finder at maatte 

 henføre til Slægten Duva, omendskjønt flere af dem afvige 

 fra den oprindelig givne Slægtskarakter derved, at der 

 tindes Kalkspikler saavel i Stammen som i Grenene. At 

 danne en ny Slægt for disse anser jeg ikke fornødent; thi 

 naar undtages Kalkafsætningen i Stamme og Grene, saa 

 have de baade i deres ydre og indre Bygning saameget 

 tilfelles, at en Adskillelse i to Slægter ikke vil kunne be- 

 grundes. Hertil kommer, at jeg hos enkelte Arter har 

 fundet Antydninger til Overgange, idet der nemlig enten 



1 Bergens Museum. Nye Alcyonider, Grorgonider og Penna- 

 tulider, tilhørende Norges Fauna ved J. Koren og D. C. Danielssen. 

 Pag. .!. Bergen 18S3. 



closely enveloping branches. These are thick and short, 

 and at the extremities they become dilated in spheriform, 

 the polyps being especially situated there. The polyp-cells 

 are cylindrical, and placed close to each other; they are 

 furnished with 8 separated, longitudinal ribs rich in spicules, 

 between which there is a narrow bare furrow that, in proximity 

 to the margin of the cell, becomes dilated to a, triangular 

 space. The polyps 5— 6 mm in length, cylindrical, dilating, in 

 proximity to the tentacular disk, in infundibuli form, 

 where, 8 triangular bare areas richly occupied by nema- 

 tocysts are found. The tentacles are half the length of 

 the body, and are furnished with spicules on their aboral 

 surface. The pinnules are devoid of spicules. On the 

 pinnules, and also on the adoral side of the tentacles, a 

 multitude of nematocysts are found. On the basal part, 

 principally, bi-stellate spicules. On the stem, principally, 

 complex stellates and peculiar, broad, richly ornamented, 

 spicules. On the polyp-cell, elliptic fusees, bistellates and 

 peculiar quadruplets. On the polyp-body, principally, long, 

 partly bent, partly straight, spicate fusees, almost everywhere 

 the spicules are, as it were, overstrewed with minute, cal- 

 careous grannules. On the gullet, two series of scattered, 

 flat, irregular spicules. The colour yellow. 



In a previous 1 work, by J. Koren and myself, I have 

 proposed to form the genus Duva and distinguished it thus: 



"The Zoanthodem aborescent, strongly ramous. The" 

 "basal part of the stem broad. The main branches long," 

 -soft, flexible, and ramifying, either into branchlets, and" 

 "these, again, into small stalks each of which carries on its" 

 "extremity several polyps; or they remain entire, but in" 

 "that case, also, they carry on the extremity a collection" 

 "of polyps (which, partly, are concreted together at the'.' 

 "root, and partly, are separated by a narrow sarcosoma.'' 

 "The polyps non-retractile, short, but well developed, and" 

 "furnished with long, fusiform, spicate spicules. The'' 

 "branches and the branchlets non-calcareous. The spicules" 

 "of the stem, partly, multi-radiate, short fusees ; partly," 

 "plain bistellates invisible to the naked eye. Septa non-" 

 "calcareous". 



Subsequent examinations have shown the necessity 

 of making some change in these characteristics. There 

 lias, in fact, been discovered during the Norwegian ISTorth- 

 Atlantic Expedition, no fewer than 8 new species which 

 I feel compelled to relegate to the genus Duva, although 

 several of them differ from the generic character origi- 

 nally stated, inasmuch that calcareous spicules are found, 

 both, in the stem as well as in the branches. I do 

 not consider it necessary to form a new genus for these, 

 because, with the exception of the calcareous deposit in 

 the stems and branches, they have, in both their interior 

 and exterior structure, so much in common, that a sepa- 

 ration into two genera can not be maintained. To this 



1 Bergens Museum. Nye Alcyonider, Gorgonider og Peuna- 

 tulider, tilhørende Norges Fauna ved J. Koren og D. C. Danielssen, 

 Pag. :;. Bergen 1883. 



