81 



væsentligst fra Grenenes Sider, ere retraktile, langstrakte. 

 Zoanthodemet er overalt i Huden vel forsynet med Spilder, 

 der gjennemgaaende optræde under Form af Dobbelt- 

 stjernen, — kun paa Polypernes Forkrop optræder Spindel- 

 formen. Svælget spikelholdigt. 



Artskarakter. 



Zoanthodemet 60—70""" høit med en noget udvidet, 

 svampet Basaldel. Stammen næsten rund, furet paalangs, 

 30 — 35""" i Omkreds ved Granden, aftagende successivt til 

 Toppen, hvor den deler sig i, to Girene, og saagodtsom 

 nogen paa to Sider (Bug og Kyg). Grenene udspringe 

 langs Stammens Sider fra Basaldelen til Toppen, staa 

 temmelig langt fra hverandre, ere alle nøgne paa den til 

 Ey-ggen svarende Side, imedens dog enkelte have to nøgne 

 Sider, lig Stammen; de længste Girene tindes paa Midten 

 af Stammen. Ligefra Grenenes Udspring og til deres 

 Ende ere de forsynede med Polyper, der udspringe dels 

 enkeltvis og direkte, dels danne Grupper, som samle sig i 

 en Smaagren. Paa Enden af Grenene er der i Alminde- 

 lighed en Samling af 6 — 8 Polyper. Polyperne ere cylin- 

 driske, 8 — 9'"'" lange, med en temmelig lang Bagkrop, hvor 

 Spiklerne ligge paatvers i Længderækker, og en noget 

 kortere Forkrop, hvor Spiklerne danne 8 Længderækker. 

 Tentaklerne halvt saalange som Kroppen. Hele Zoantho- 

 demet forsynet med Spilder, der gjennemgaaende optræde 

 under Form af Dobbeltstjerner, kun paa Polypens For- 

 krop optræder Spindelformen. Svælget har paa hver Side 

 en bred Længderække Spilder; dets Bug- og Rygside er 

 nden Spilder. Farven rødlig-gul. Polyperne svagt rosen- 

 røde. 



Nephthya flavescens, n. sp. 



(Ammothea, Lam. 1 ). 



Pl. XI. 



Zoanthodemet er indtil 30"" n 

 rund, furet paalangs, omtrent 7"™ 



høit. Stammen haarcl, 

 tyk ved Grunden, men 



1 Navnet Ammothea er givet til en Crustace-Slægt af Leach 

 1814. Lamarck, som sandsynligvis har været ubekjendt dermed, har 

 givet det samme Navn til en Alcyonide i 1816. I 1818 beskrev 



Den norske Nordhavsexpeditiou. I). C. Danielssen: Alcyonida. 



polyps which shoot out, partly singly, and partly in groups, 

 principally from the sides of the branches, are retractile 

 and elongate. The dermal covering of the Zoanthodem 

 is, everywhere, well furnished with spicules, which appear, 

 throughout, in the bistellate form. On the anterior body 

 of the polyps alone does the fusi-form appear. The gullet 

 contains spicules. 



Specific characteristics. 



The Zoanthodem measures 60 — 70""" in height, and 

 has a somewhat dilated spongy basal part. The stem is 

 almost cylindrical, longitudinally grooved, and measures 

 30 — 35""" in circumference at the base, diminishing grad- 

 ually towards the summit, where it ramifies into two 

 branches, and it is almost bare on two sides — - (the ventrum 

 and the dorsum). The branches shoot out along the 

 sides of the stem, from the basal part to the summit, and 

 are placed pretty far apart from each other; they are all 

 bare on the side corresponding to the dorsum, whilst a 

 few, however, have two bare sides like the stem. The 

 longest branches are found at the middle of the stem. 

 Quite from the root of the branches and up to their extre- 

 mities, they are furnished with polyps which appear, partly 

 singly and direct, and partly forming groups that collect 

 themselves into a branchlet. On the extremities of the 

 branches, there is, usually, a collection of 6 — 8 polyps. 

 The polyps are cylindrical, 8 — 9""" long, have a rather 

 long posterior body, where the spicules are situated trans- 

 versally, in longitudinal series ; and a somewhat shorter 

 anterior body, where the spicules form 8 longitudinal 

 series. The tentacles are half the length of the body. 

 The whole of the Zoanthodem is furnished with spicules 

 which appear, throughout, in' the form of bistellates; on 

 the anterior body of the polyps alone does the fusi-form 

 appear. The gullet has on each side, a broad longitudi- 

 nal series of spicules, whilst its ventral and dorsal sides are 

 devoid of spicules. The colour is reddish yellow. The 

 polyps, faint rose-red colour. 



Nephthya flavescens, n. sp. 



(Ammothea, Lam. 1 ). 



PI. XI. 



The Zoanthodem measures up to 30""" in height. 

 The stem is hard, cylindrical, and furrowed longitudinally 



1 The designation Ammothea is applied to a crustaceous genus, 

 by Leach, in 1814. Lamarck, who was probably ignorant of this 

 fact, has given the same designation to an Alcyonoid, in 1816. In 



11 



