71 



Polyperne ere udvendigt beklædte med et Ectoderm, 

 der har den samme Bygning som Stammens og Grenenes, 

 — kun er det mindre bredt; ogsaa her iagttages encellede 

 Slimkjertler, liggende temmelig tæl imellem Ectodermeellerne. 

 I Eetodermet ere Spiklerne indleirede ligesom Tilfældet er 

 paa Stammen. 



Svælget er cylindrisk. foldet, ng paa dets ydre Flade 

 er indleiret i Epithelet 2 Rækker Spilder, en paa hver 

 Side; de ere fra 0.068— 0. 120""" lange og fra 0.040— 

 0.048°"" brede, — kun en Firling fandtes paa det hele 

 Svælg, forresten Spindler. Fig. 3. Paa Svælgets indre 

 Flade sees langs Bugsiden en næsten triangulær Rende, 

 der tager sin Begyndelse nogle Millimeter nedenfor Mund- 

 aabningen og strækker sig ned imod Svadgets fri Ende. 

 Svælgrenden er beklædt med lange Pidskeceller. hvis 

 Svober rage langt op i Svælghulheden og adskille sig 

 ikke fra dem, der ere omtalte hos Slægterne Væringia 

 og Drifa. Den øvrige Del af Svælgets indre Flade er 

 beklædt med aflange Celler, forsynede med Cilier, der 

 dog langtfra ere saa lange og stive som Pidskecellernes. 

 Imellem de nævnte Celler sees en Mængde aflange, en- 

 cellede Slimkjertler, ikke væsentlig afvigende fra dem, jeg 

 har omtalt hos Væringia og Drifa. I Svælgrenden fandtes 

 ingen Slimkjertler; men lige under Epithelet paa dens 

 overste Del saaes nogle store, pæreformige Celler med en 

 stor Kjerne, omgiven af Protoplasma, og som lignede de 

 Ganglieceller, der fandtes hos Væringia just paa samme Sted. 



Generationsorganerne udvikle sig paa flere Septula, 

 dels i den bagre Del af Mavehulhieden, dels i dennes For- 

 lengelse ned i Grenen. Æg i forskjellige Udviklingsstadier 

 iagttoges hos en hel Del Polyper. 



Zooiderne, hvoraf der gives en stor Mængde, ere 

 langstrakte, have en temmelig tynd Kropshud, en rund 

 Mundaabning og et cylindrisk Svælg. fra hvis nedre Ende 

 udgaa to yderst korte, fine Forlængelser (Gastralfilamenter'/). 

 der kun iagttoges hos nogle faa, imedens de fleste Zooider 

 syntes at være uden saadanne. Da Svælget laa meget 

 tæt til Kropshuden. uden at det var muligt at se nogen 

 Skillevæg, havde disse Zooider megen Iiighed med Ten- 

 takelrorene hos Sostjernerne, og deres Function tor være 

 den samme, Fig. 2, g. 



Spiklerne paa Basaldelen ligge kompakt paa hver- 

 andre og ere meget vanskelige at isolere. De hyppigste 

 Former ere Dobbeltstjerner og mere sammensatte Stjerner. 

 Dobbeltstjernerne ere fra 0.076—0.124""" lange og fra 

 0.048—0.068""" brede og have som oftest et nogent Midt- 

 belte, Fig. 4 — 6. De mere sammensatte Stjernespikler ere 

 tildels temmelig uregelmæssige og deres Straaler snart 

 bladformede, snart vortede i Enderne; de ere fra 0.104 — 



The polyps are. exteriorly, clad with an ectoderm 

 that has the same structure as that of the stem and the 

 branches, only not quite so broad, aud. here, unicellular 

 mucous glands are also observed. placed, pretty closely, 

 between the ectoderm cells. The spicules are entrenched 

 in the ectoderm, in same manner as in the stem. 



The gullet is cyhndrical, folded, and, on its exterior 

 surface, 2 series of spicules are entrenched in the epithel- 

 ium, one series on each side; these measure from 0.068 — 



0.120 in length, and from 0.040— 0.048""" in breadth; 



one quadruplet only was found on the entire gullet, other- 

 wise, fusees (Pl. VIII, fig. 3). On the inner surface of 

 the gullet there is observed, along the ventral side. an 

 almost triangular channel, which has its origin a few milli- 

 metres below the oral aperture, and extends down towards 

 the free extremity of the gullet. The gullet channel is clad 

 with long flagelliform-cells whose' whips reach far up into 

 the gullet cavity, and they do not differ from those which 

 are mentioned in connection with the genera Væringia 

 and Drifa. The remainder of the inner surface of the 

 gullet is clad with oblong cells furnished with eiliæ 

 which, however. are far from being so long and stift" 

 as those of the flagelliform-cells. Between the cells men- 

 tioned, a multitude of oblong unicellular mucous glands are 

 observed, not differing, materially, from those I have 

 described in connection with Væringia and Drifa. In 

 the gullet channel, no mucous glands are found, but just 

 below the epithelium, on its uppermost part, a few large. 

 piriform cells were seen, containing a large nucleus sur- 

 rounded by protoplasm, and these resembled the ganglial- 

 cells which were found in Væringia exactly in the same 

 situation. 



The generative organs develope themselves upon 

 several septula, partly. in the posterior part of the ventral 

 cavity, partly, in its prolongations down into the branch. 

 Ova in different stages of development were observed in a 

 large number of polyps. 



The Zooids, of which there are a great multitude, 

 are elongate, and have a rather thin integument on the 

 body. a circular oral aperture, and a cylindrical gullet trom 

 whose lower extremity two, extremely short, slender pro- 

 longations proceed (gastral filaments?); these are only 

 seen in a few, whilst the greater number of Zooids ap- 

 pear to be vvithout any such. As the gullet lay very close 

 to the integument of the body, without it being possible 

 to detect any divisional wall, these Zooids had much re- 

 semblance to the tentacular tubes of the Asteroideæ, -and 

 their function may, perhaps, be the same (Pl. VIII, 

 (ng. 2, g). 



The spicules on the basal part are placed com- 

 pactly upon each other, and are very difficult to isolate. 

 The most frequent forms are bistellates, and more com- 

 plex steiktes. The bistellates measure. from 0.076 — 

 0.124""" in length, and from 0.048— 0.068""" in breadth, 

 and have, most frequently, a bare mesial belt (Pl. VIII, 

 figs. 4 — 6). The more complex stellate-spicules are, 

 partly, rather irregular; their rays are sometimes foliaceous, 



