Polypeme ere retraktile, cylindriske, vandklare, 12""» 

 lange. Kroppen er 8™" lang og har paa sin udvendige 

 Side 8 Linier, der dele den i 8 Længdefelter, hvert for- 

 synet med 2 Eækker tæt paa hinanden liggende Spilder, 

 Fig. 3. Tentaklerne ere 4""" lange og have paa deres aborale 

 Flade, lige til deres Spids, 2 Rækker Spikier, Fig. 3. 4. 



Den nederste Del af Tentakelen er hyppigt blottet for 

 Pinnuler; hvor disse ere tilstede, staa de meget spredte og 

 ere meget smaa, Fig. 4. Pinnnlerne ere uden Kalk. 



Munden er aflang med lidt opsvidmede Læber. 



Zoanthodemets anatpmisk-histologiske Bygning. 



Stammen er omgiven ai et tykt Ectoderm, bestaaende 

 af mange Lag Celler, der ere af lidt forskjellig Størrelse 

 og Form. De yderstliggende ere polyædriske, 0.011™'" brede, 

 have en tynd Membran, som indeslutter en rund Kjerne, 

 0.002""" stor, forsynet med et Kjernelegeme og omgiven af 

 en yderst sparsom Protoplasm amasse, saa at de have et 

 næsten vandklart Udseende, Fig. 5. De indenfor liggende 

 Celler ere mindre kantede, antage dels en rund, dels en 

 aflang Form, ere fra 0.011—0.013'"'" lange med en mnd 

 Kjerne, 0.002""", og Kjernelegeme, omgiven af et tættere, 

 finkornet Protoplasma, Fig. 6. Disse Celler ere ikke saa 

 klare som de, der tindes i det ydre Lag. 



Indenfor Eetodermet er et bredt, hyalint Bindevævslag, 

 hvori sees en Mængde større og mindre Ernæringskanaler, 

 der korrespondere med hverandre og ere beklædte med et 

 Epithel, hvis Celler ere lidt aflange, have en rund Kjerne, 

 indhyllet i Protoplasmaindholdet, Tab. II, Fig. 1, a. I de 

 mindste af disse Saftkanaler er Lumenet ganske udfyldt af 

 dette Epithel, Tab. Il, Fig. 1, b, hvorom jeg i tidligere Af- 

 handlinger over Pennatulider og Alcyonicler har udtalt mig 

 udførligt 1 . 



Imellem Saftkanalerne ligge spredte Binclevævslegemer, 

 der ere dels aflange, dels kantede med en lidt aflang 

 Kjerne og dens Kjernelegeme samt mange Udløbere, Fig. 7, 

 som korrespondere med de tilgrændsende Celler. Disse 

 Binclevævsceller staa med enkelte af sine Udløbere i direkte 



1 Fauna littoralis Norvegiæ ; 3die Hefte. 

 Nye Alcyonider, G-orgonider og Pennatulider, tilhørende Norges 

 Kyst, ved J. Koren og D. Danielssen. Pag. 2. Bergen 1883. 



The polyps are retractile, cylindrical, and pellucid, 

 and they measure 12""" in length. The body is 8""" long, 

 and has, on its exterior side, 8 lines which divide it into 

 8 longitudinal areas, each of which is furnished with 2 

 series of spicules placed close to and upon each other, 

 (PI. I, fig. 3). 



The tentacles measure 4""" in length, and on their 

 aboral surface, right up to their point, have 2 series of 

 spicules, (PI. I, figs 3. 4). The lowest part of the tentacle 

 is frequently devoid of pinnules; when these are present 

 they are placed much dispersed, and are very minute, 

 (PI. I, fig. 4). The pinnules are non-calcareous. 



The oral aperture is oblong, with slightly tumified 

 labiæ. 



The Anatomo-histological structure of the Zoanthodem. 



The stem is encompassed by a thick ectoderm con- 

 sisting of many layers of cells, which are of somewhat vari- 

 able size and form. Those lying on the extreme exterior 

 are polyhedrical, and measure 0.011""" in breadth, and they 

 have a thin membrane which encloses a round nucleus mea- 

 suring 0.002""" in diameter, furnished also with a nucleus 

 body surrounded by an extremely sparing protoplasmic 

 mass, so that they acquire an almost translucent appearance, 

 (PL I, fig. 5). The cells, which lie inside, are not so 

 polygonal, and they take, partly, a cylindrical, partly, an 

 oblong form, and measure from 0.011—0.013'"'" in length; 

 they have a round nucleus measuring 0.002'"™ in diameter, 

 and a nucleus body surrounded by a dense, minutely-granular 

 protoplasm, (PL I, fig. 6). These cells are not so translucent 

 as those which are found in the exterior layer. 



Inside of the ectoderm there is a broad, hyaline, con- 

 nective-tissue layer, in which a multitude of larger and 

 smaller nutritory ducts are visible; these correspond with 

 each other, and are coated with an epithelium whose cells 

 are slightly oblong, and contain a round nucleus enclosed 

 in the protoplasmic substance, (PL II, fig. 1, a). In the 

 smallest of these nutritory- ducts, the channel is quite filled 

 out by this epithelium, (PL II, fig. 1, &), regarding which 

 I have spoken, at length, in my previous treatises con- 

 cerning Pennatulidæ and Alcyonidæ L 



Between the nutritory ducts there lie dispersed, con- 

 nective-tissue corpuscles, which are, partly, oblong, partly, 

 angular, and have a slightly oblong nucleus and its nucleus 

 body, as well as numerous prolongations, (PL I, fig. 7) 

 which correspond with the adjoining-cells. These conuec- 



1 Fauna littoralis Norvegiæ 3die Hefte. 



Nye Alcyonider, Gorgonider og Pennatulider, tilhørende Norges 

 Kyst, ved J. Koren og D. Danielssen. Pag. 2. Bergen 1883. 



