38 



Basaldelen er fast, læderagtig og føles noget ru af 

 den i den ydre Hud afsatte Kalk; den øvrige Del af 

 Stammen er blødere, glattere, meget bøielig, aftager noget 

 i Tykkelse og er mindre rig paa Kalk; men ved stærk 

 Loupe kan dog Spilder iagttages i Coenenchymets ydre 

 Made, Fig. 2. Stammens øverste Ende deler sig i 3 

 Hovedgrene, der igjen dele sig. De nederste Grene ere 

 de korteste, ofte kun et Par Millimeter; længere op paa 

 Stammen afvexle korte og lange Grene om hverandre uden 

 nogen Regelmæssighecl, Fig. 1. De længste Grene ere 

 omkring 35 ,nm lange og 25 """ i Omkreds ved deres Ud- 

 spring. Grenene ere glatte, runde, furede efter Længden, 

 dele sig i kortere eller længere Afstand fra Stammen i 

 4 — 5 mindre Grene, der ere korte, men forholdsvis tykke, 

 og som atter deles i omtrent lige mange Smaagrene. fra 

 hvilke udgaa 3 — 5 Stilke, der hver bære 3 — 5 Polyper, 

 Fig. 1. 2. Samtlige disse Grene ere i levende Live halv 

 gjennemsigtige. temmelig faste, ligesom elastiske ved Tryk, 

 idet Længdekanalerne ere stærkt udspændte af Ernærings- 

 vædske og forsynede med Kalkspikler. 



Polyperne ere 7 — 8""" lange, ikke retraktile, udspringe 

 alle fra Grenenes yderste Forgreninger, ere cylindriske, 

 noget bredere ved Mundskiven, men smalne af mod den 

 temmelig lange Bagkrop, Fig. 2. Hyppigst ere to Polyper 

 sanimenvoxede ved Grunden, og da er Stilken, hvori de 

 gaa over, noget tykkere, Fig. 3. Polypkroppens ydre 

 Flade er forsynet med 8 dobbelte Længderækker Spikier, 

 der strække sig lige fra, Grunden og op til Tentaklernes 

 Basaldel uden at gaa over paa disse, Fig. 3. Tentaklerne 

 ere fra 3 — 4 mm lange, omtrent ligesaa lange som Kroppen, 

 forsynede med Pinnuler og uden Kalkspikler. 



Den histologisk-anatomiske Bygning af Slægten Duva 

 har J. Koren og jeg i et tidligere Arbeide 1 beskrevet og 

 skal jeg kun her tilføie, at paa Svælgets indre Flade er en 

 triangulær Grube, der er beklædt med lignende Pidskeepithel, 

 som det, der er omtalt hos Slægten Vceringia ; tillige tindes 

 imellem det øvrige Epithel, som beklæder den indre Svælg- 

 væg, encellede Slimkjertler, lig dem hos Vceringia. 



Stammens Basaldel er rig paa Spilder, der optræde 

 som Spindler og Dobbeltstjerner. Spindlerne ere stærkt 

 tornede, dels lige, dels krumme med tilspidsede Ender; de ere 



1 Bergens Museum. Nye Alcyonider, Gorgonider og- Penna- 

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



The basal part is firm and coriaceous, and it feels 

 somewhat rough to the touch, owing to the calcium deposited 

 in the exterior integument. The remaining part of the 

 stem is softer, smoother, and very flexible, and it dimi- 

 nishes somewhat in thickness; neither is it so rich in 

 calcium, but with the assistance of a powerful magnifier, 

 spicules may, however, be observed in the exterior surface 

 of the sarcosoma (PI. Ill, fig. 2). The uppermost extre- 

 mity of the stem ramifies into 3 main branches, which 

 again ramify. The lowest branches are the shortest ones, 

 measuring, frequently, only a couple of millimetres in 

 length. Further up the stem, short and long branches alter- 

 nate with each other without any regularity (PI. Ill, 

 Fig. 1). The longest branches measure, about 35""" in 

 length, and 25'"'" in circumference at their root. The 

 branches are smooth, cylindrical, and longitudinally grooved, 

 and, at a greater or lesser distance from the stem, ramify 

 into 4—5 smaller branches, which are short, but relatively 

 thick, and which, again ramify into about a similar num- 

 ber of branehlets from which 3—5 stalks proceed, each 

 of them carrying 3—5 polyps (PL III, figs. 1. 2). All of 

 these branches are, in the live state, semi-transparent, 

 pretty firm, and, as it Avere, elastic upon application of 

 pressure, owing to the longitudinal ducts being greatly 

 dilated by the nutritory fluids; they are also furnished with 

 calcareous spicules. 



The polyps measure 7—8'""' in length, are non- 

 retractile, and they all spring from the extreme ramifica- 

 tions of the branches; they are cylindrical, somewhat broad- 

 est at the oral disk, but diminish in breadth towards 

 the rather long posterior body (PI. Ill, fig. 2). Very 

 frequently, two polyps are concreted together at their root, 

 and the stalk into which they are produced is. then, 

 somewhat thicker (PL III, fig. 3). The exterior surface 

 of the body of the polyp is furnished with 8 double lon- 

 gitudinal series of spicules, which extend themselves right 

 from the root, and up to the basal part of the tentacles 

 without, however, being produced into these (PL III, 

 fig. 3). The tentacles measure from 3 — 4 mm in length — 

 about the same length as the body — and they are furnished 

 with pinnules, and are devoid of calcareous spicules. 



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

 described the anatomo-histological structure of the genus 

 Duva, and shall only add, here, that on the inner surface 

 of the gullet there is a triangular cavity which is lined 

 with a similar flagellate-celled epithelium to that spoken of 

 in connection with the genus Vceringia; further, that between 

 the remaining epithelium which clothes the inner wall of the 

 gullet, there are found unicellular mucous glands like those 

 in Vceringia. 



The basal part of the stem is rich in spicules, which 

 appear as fusees and bistellates. The fusees are strongly 

 spicate, partly bent, partly straight, with acuminated 



1 Bergens Museum. Nye Alcyonider, Gorgonider og Penna- 

 tulider. tilhørende Norges Fauna ved J. Koren og D. 0. Danielssen 



