94 



Findested. 



Nogle meget smaa Exemplarer. 



Habitat. 



Station 2', 



Station 267. 2 Exemplarer. 



Station 275 4 Exemplarer. 



Artskarakter. 



Zoanthodemet indtil 35""" høit, busket. Basaldelen 

 skiveformigt udvidet, fast, meget kalkholdig. Stammen 

 rund. den nederste Halvdel blottet for Grene, men tæt 

 besat med Foraminiferer. Grenene tykke, rigt besatte med 

 Polyper, ordnede saaledes, at liver Gren danner næsten en 

 Kugle. Stammen og Grenene spikelrige. Polyperne, der 

 udspringe direkte fra Grenene, ere 4""" lange, traktformige 

 med en kort Bagkrop. Tentaklerne 1.5"™ lantre. tykke og 

 aoget afstumpede. Polypkroppen, især paa Rygsiden og 

 paa Tentaklerne, er meget rig paa Kalk; Pinnulerne uden 

 denne. Paa Basaldelen og nederst paa Stammen er 

 Dobbeltstjernen almindeligst. Paa Stammens øvrige Del 

 og Grenene er Dobbeltstjernen meget sjeldnere, men her 

 er enklere, næsten spindelformige Spikler hyppigst; paa 

 Polyperne ere Køller og Klubber almindeligst. 



Station No. 237. A few very small specimens. 

 Station No. 267. Two specimens. 

 Station No. 275. Pour specimens. 



Speeiflc characteristics. 



The Zoanthodem measures up to 35""" in height, 

 fruticose; the basal part discoidally dilated. hard. very cal- 

 careous. The stem cylindrical, the lowest half part devoid 

 of branches but closely occupied by foraminifera. The 

 branches thick, richly beset with polyps, arranged so that 

 each branch forms, almost, a ball. The stem. aud the 

 branches. rich in spicules. The polyps spring direct from 

 the branches. measure 4""" in length, are infundihuliform. 

 with a short posterior body. The tentacles measure 1.5 " 

 in length, are thick and somewhat truncated. The polyp- 

 body, especially on the dorsal side and upon the tentacles, 

 is verv rich in calcium. The pinnules noncalcareous. In 

 tin 1 basal part, and lowest part of the stem. the bistellate 

 spicular form is the most frequent. < >n the rest of the 

 stem. and the branches, the bistellate form is muen rarer, 

 and, here, plainer. aearly fusiform, spicules are the most 

 frequent. On the polyps, subclavates, and clavates, are the 

 niost usual fonns. 



Farven. 



Stammen, Grenene, Polypkroppen og den nederste 

 Halvdel af Tentaklerne sva»; brunrød; den øverste Halvdel 

 samt Pinnulerne mørk kastaniebrun. 



Colour. 



Tin- stem. the branches. the polyp-body, and the 

 inferior half-part of the tentacles are faiut brownish-red. 

 The superior half-part, aud the pinnules. dark chestnut-brown. 



Embryologiske Undersøgelser. 



De ovenfor beskrevne Arter af Slægten Nephthya føder 

 levende (Jnger, hvilket forøvrigt er det Almindeligste blandt 

 Alcyoniderne. Hos alle fandtes forskjellige Udviklings- 

 stadier af de i Mave- og Svælghulheden indesluttede Æg 

 og Embryoner; men da Exemplarerne vare opbevarede i 

 Spiritus, er det selvsagt, at Undersøgelserne maa blive 

 mangelfulde og ikke mindst derved, at det er ugjørligt at 

 fremstille en sammenhængende Haike i Udviklingen. Paa 

 Nordhavsexpeditionen havde jeg hverken Tid. ei heller var 

 Søen saa rolig, at jeg kunde anstille embryologiske Under- 

 elser; imidlertid tor de paa Spiritusexemplarer foretagne 

 Iagttagelser have nogen Interesse derved, at de udfylder 

 enkelte Huller i Alcyonidei - nes Embryogeni og for en Del 

 konstaterer de af Kowalevsky og Marion 1 anstillede Obser- 

 vationer over Alcyonidernes Udvikling. 



Embryological Examination. 



Both the above described speciesof the genus Nephthya 

 give birth to living young, which is. also. the usual case 

 amongst the Alcyonoids. In both of them, different 

 developed stages in the ova and embryons contained in 

 the ventral cavity were found, but as the specimens were 

 preserved in alcohol, it is a matter of course that the 

 examinations must be imperfect, none the less so. that it 

 is impracticable to procure a continuous series in develop- 

 ment. On the North-Altantic Expedition, neither bad I 

 time. nor was the ocean so calm that I could undertake 

 embryological examinations. Bowever, the observations 

 made. upon the specimens preserved in alcohol, inay have 

 sonie interest, because they serve to till up some voids in 

 the embryogeny of the Alqyonoids, and to some extent they 

 confirm the observations made by Kowalevsky and Marion 1 

 upon the development of the Alcyonoids. 



1 A. Iv • et A. F. Marion: Documents pour 1'histoire 



embryogénique des Alcyonaires. Annales du Musée d'histoire naturelle 

 de Marseille. — Zoologie. Tome I. Memoire Xe. 4. Marseille 1883. 



1 A. Ivow: et A. F. Marion: Documents pour l'histoire 



embryogénique des Alcyonaires. Annales 'lu Musée d'histoire naturelle 

 'le Marseille. Zoologie. Tome 1. Memoire No. 4. Marseille 1883. 



