41 



Hele Polypkroppen forsynet med 8 Dobbeltrækker takkede. 

 dels spindel-, dels kolleformede Spikler, hvorimellem sees 

 enkelte korsformede Firlinger. Tentaklerne uden Spikler. 

 Farven gul, spillende lidt i det Rode. 



Duva aurantiaca. n. sp. 



Tab. IV. Fig. 1—41. 



Zoanthodemet er 75 høit. Stammen er rund. tem- 

 melig stiv, furet paalangs, 40'""' i Omfang ved Grunden. 

 men aftager noget i Tykkelse opad, hvor den ender i to 

 tykke Grene. Basaldelen er fast, læderagtig, stærkt furet 

 paa langs og ikke synderlig udvidet. Omtrent 30""" fra 

 Grunden er hele Stammen rundt om forsynet med Grene, 

 der staa noget fra hverandre og afvexle i Længde og Tyk- 

 kelse. De nederste ere kortest og tyndest, men tiltage 

 opad. saa at de øverste ere baade de længste og tykkeste. 

 Grenene ere temmelig stive, furede og dele sig enten lig? 

 ved deres Udspring, eller strax efter i en eller flere 

 Smaagrene, der igjen forgrene sig i flere, tynde Stilke, 

 som bære 4 — 8 Polyper, hvoraf snart 2, snart 3 ere 

 sammenvoxede ved Grunden. Fig. 1. 2. Saavel i Stammen 

 som i samtlige Grene, Smaagrene og Stilke tindes rigelige 

 Kalkafsætninger, der give dem deres Fasthed. 



Polyperne ere korte. 5 — 6""" lange, ikke synderlig 

 gjennemsigtige. Mundskiven meget bred, lidt hvælvet. 

 Munden lidt fremspringende, næsten rund. Kroppen er 

 3—4""" lang. har paa Dorsalsiden G Spikelrækker, 3 — 4 

 Spikler i Bredden, hvilke strække sig langs hele Kroppen 

 og et Stykke op paa Tentaklerne, Fig. 3; paa Ventralsiden 

 er to korte Spikelrækker. som tabe sig omtrent midt paa 

 Kroppen i et bredt Spikelbelte, der gaar tvers over denne. 

 Fig. 4. Oven- og nedenfor dette Belte er Bugfladen uden 

 Spikler. Fig. 4. Tentaklerne ere uoget kortere end Krop- 

 pen, tykke og paa deres aborale Sides nederste Halvdel 

 forsynede med en Spikelrække, Fortsættelse af Kroppens, 

 Fis. 3. 



Hele Zoanthodemet er rigt paa Kalk. I Basaldelen 

 ligge Spiklerne pakkede paa hverandre og fremtræde under 

 mange Former. Spindelformen er den hyppigste, saaledes: 

 Spindler, som ere vingeformigt udvidede og sparsomt be- 

 satte med Takker. 0.088""" lange. 0.044""" brede. Fig. 5 6; 

 takkede, sammensatte Spindler med stumpe Ender og vidt 

 fra hverandre staaende Takker eller Udløbere, der ere for- 



Den norske Nordhavsexpedition. D. C. Danielssen: Alcyonida. 



spicules of variable forms. The polyps elongate, cylindri- 

 cal, with a rather long posterior body. The entire body 

 of the polyp furnished with 8 double series of spicate, 

 fusiform. partly, sub-claviform spicules, amongst which are a 

 fe w cruciform quadruplets. The tentacles devoid of spicules. 

 The colour yellow. shading n little towards red. 



Duva aurantiaca. n. sp. 



Pl. IV. Fi ? . i -41. 



The Zoanthodem measures 75""" in heigbt. The 

 stem is cylindrical. pretty stift', and longitudinally grooved; 

 and it measures 40""" in circumference at the base, dim- 

 inishing. somewhat, in thickness upwards, where it termi- 

 nates in two thick branches. The basal part is tinn. 

 coriaceous, and strongly grooved longitudinally. and is not 

 particularly dilated. About 30""" from the base. the en- 

 tire stem is. round about it, furnished with branches. which 

 are placed somewhat apart from each other and alternate 

 in length and thickness. The lowest ones are shortest 

 and thickest, but they become enlarged. upwards. so that 

 the uppermost ones are. both, the longest and tbe thickest. 

 The branches are rather stiff ; they are grooved. and ramify 

 eitber quite at their root, or immediately beyond it, into 

 several branchlets which again ramify into several thin stalks 

 carrying 4 — 8 polyps, of which, sometimes two. and somr- 

 times three, are concreted together at the base (figs. 1. '2). 

 Both. in the stem, as well as in all of the branches. tbe 

 branchlets aud the stalks. abundant calcareous deposits are 

 found. which impart to them their stiffness. 



The polyps are sbort, and measure 5 — <3""" in length. 

 and they are not particularly transparent. The oral-disk 

 is very broad, and somewhat arcuate. The oral aperture 

 is rather protuberant and almost circular. The body 

 measures 3 — 4""" in length, and has, upon its dorsal side. 

 6 spicular series. 3 — 4 spicules in the breadth. and these 

 extend themselves along the entire body and some way up 

 the tentacles (fig. 3). On the ventral side, there are two 

 short spicular series which crowd together about the middle 

 of the body, into a broad spicular belt that passes across 

 it (fig. 4). Above and below this belt, the ventral sur- 

 face is devoid of spicules (fig. 4). The tentacles are some- 

 what shorter than the body, and thick. and, on the lowest half 

 part ot their aboral side, they are furnished with a spicular 

 series which is a continuatiou of that of the body (fig. 3). 



The entire Zoanthodem is rich in calcium. In the 

 basal portion, the spicules lie packed upon each other, 

 and present themselves in many forms. The fusi-form is 

 the most frequent one; appearing tims. as fusees, pennately 

 expanded, sparingly beset with spikes, and measuring 0.088""" 

 in length, and 0.044""" in breadth (figs. 5. 6); spicate, 

 complex fusees. with blunt extremities. and spikes, placed 



