Polyperne ere retraktile, eylindriske, 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 Rrekker tæt paa hinanden liggende Spikka-, 

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

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



Den nederste Del af Tentakelen er hyppigt blottet for 

 Pinnuler: hvor disse ere tilstede, staa ile megel spredte og 

 ere meget smaa, Fig. 4. Pinnulerne ere nden Kalk. 



Munden er aflang med lidt opsvulmede Læber. 



Zoanthodemets anatomisk-histologiske Bygning. 



Stammen er omgiven at et tykt Ectoderm, bestaaende 

 at' mange Lag (Adler, der ere af lidt forskjellig Storrelse 

 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 Protoplasmamasse, saa at de have et 

 næsten vandklart Udseende, Fig. 5. De indenfor liggende 

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

 atlant;' Form, ere fra 0.011 — 0.013""" lange med en rund 

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

 finkornet Protoplasma, Fig. (i. I>is-o Celler ere ikke saa 

 klare som de, der tindes i det ydre Lag. 



Indenfor Ectodermet er et bredt, hyalint Bindeveevslag, 

 hvori sees en Msengde 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 Protoplasmaiudholdet, Tab. II, Fig. 1, a. I de 

 mindste af diss.' Saftkanaler or Lumenet ganske udfyldt af 

 dette Epithel, Tab. 11, Fii;-. 1. b, hvorom jeg i tidligere Af- 

 handlinger over Pennatulider og Alcyonider har udtalt mig 

 udforligt 1 . 



Imellem Saftkanaleme ligge spredte Bindevævslegemer, 

 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 

 Bindevævsceller staa med enkelte af sine Udløbere i direkte 



1 Fauna littoralis Norvegiæ; 3die Hefte'. 

 Nye Alcyonider, Grorgonider og Pennatulider. tilhørende Norges 

 Kyst. ved J. Koren og D. Danielssen. Pao-. _'. Borgen 1883. 



The polyps are retractile, cylindrical, and pellueid. 

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

 and has, on its exteribr side, 8 lines which di vide it into 

 8 longitudinal areas, each of which is furnished with 2 

 series of spieules placed cJose to and upon each other, 

 (Pl. I, Ag- 3). 



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

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

 spieules, (Pl. 1. figs 3. 4). The lowest part of the tentacle 

 is frequently devoid of pinnules; when these are present 

 they are placed mueh dispersed, and are verv minute, 

 (Pl. I. fig: 4 1. The pinnules are non-calcareous. 



The oral aperture is oblong, with slightly tumified 

 lai lia.-. 



The Anatomo-histological structure of the Zoanthotlem. 



The stem i> encompassed by a thick ectoderm con- 

 sisting of many lavers of cells, which are oi' somewhat vari- 

 able si/.o and form. Thoso 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 thai they acquire an almost translucent appearance, 

 (Pl. I, fig. 5). The cells, which lic inside, are not so 

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

 oblong form. and measure from (.1.011 — 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, rig. 0). These cells are not s,> translucent 

 as those which are tound in the exterior laver. 



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

 nective-tissue layer, in which a multitude of Iarger 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. U, fig. 1. b), 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 ha\ T e a slightly oblong nucleus and its nucleus 

 body, as well as numérous prolongations, (Pl. I, fig. 7) 

 which correspond with the adjoining-cells. These connec- 



1 Fauna littoralis Norvegiæ '.dir- Hefte. 



Nye Alcvonider. Gorgonider og Pennatulider, tilhørende Norges 

 Kyst, ved J. Koren og D. Danielssen. Pag. 2. Bergen 1 v ^3. 



