62 



en Mængde kolbeforniige Slimkjertler med en langstrakt 

 Hals, der som oftest udnmnder paa Svælgets indre Flade, 

 Fig. 7. e. Disse Kolbeeeller ere ganske lig de føromtalte, 

 encellede Slimkjertler i Ectoderm et; men i Svælget ere de 

 lettere at iagttage, ligesom Indholdet ofte ligger dels i. 

 dels ndenfor Udførselskanalens Aabning. Svælgets indre 

 Flade er ofte overtrukken med en seis Slimmasse. 



Svælggruben danner en oval Hende, der strækker sig 

 nogle Millimeter fra den aflange Mnndaabning og lige ned 

 til Svælgets Ende. Fig. 7, /. Den er forsynet med lange, 

 smale Pidskeceller, som hver bærer en lang Cilie. der 

 flimrer frit i Hulheden, Fig. 7. g. 



Gastralfilam ent erne afvige ikke i sin Bygning fra 

 dem, jeg omtalte hos Slægten Yæringia, og hvorved jeg for 

 en Del kan konstatere de af Englænderen Edm. Wilson 

 gjorte Iagttagelser, betræffende de to lange Dorsal-mesen- 

 terialfilam enters Bygning. Hvorvidt disse to Organer 

 ndelukkende staa i Circulationens Tjeneste, kan jeg ikke 

 afgjøre; men den Omstændighed, at cle følge Mavehulheden 

 i dens hele Længde og ere rigt beklædte med lange 

 Cilier, synes at tale derfor. 



Kjønsprodnkterne udvikle sig i den nederste Del af 

 Mavehulheden paa Septula i særegne Kapsler. Kjønnene 

 ere adskilte. Paa det ene Exemplar, jeg har havt til 

 Undersøgelse, ere Individerne Hunner. 



Jeg har tidligere omtalt, at der overalt i Zoantho- 

 demets ydre Hud findes en Mængde Spikier; jeg skal nu 

 nærmere beskrive disse. 



I Basaldelen ligge Spiklerne kompakt paa hverandre 

 og danne dels bladede, dels vortede Klubber med yderst 

 kort Haandgreb, fra 0.1 10— 0.1 40""» lange og fra 0.060 

 —0.080»"" brede foroven, Fig. 8. 9. 10; korte, takkede 

 Spindler med afstumpede Ender, fra 0.060— 0.120""" lange, 

 og fra 0.025— 0.040™ m brede; de mindste have faa Takker 

 med et bredt, nøgent Midtbelte, Fig 11; smaa Dobbelt- 

 stjerner, 0.052»"» lange, 0.020'""' brede i Enderne og 0.010""" 

 brede paa Midten, Fig. 12; større Dobbeltstjerner med et 

 Midtbelte dels nøgent, dels besat med Takker og 0.112"""' 

 lange, 0.060"™ brede i Enderne ; byppigt er den ene Ende 

 bredere end den anden og rigere paa Takker, Fig. 13. 14. 15. 



Paa Stammen ere Dobbeltstjerner den hyppigste 

 Spikelform; de ere fra 0.060—0.088»"» lange og fra 0.040 

 — 0.060""" brede i Enderne ; det nøgne Midtbelte er fra 

 0.016—0.020""" bredt, Fig. 16, 26; de træffes i forskjellige 

 Udviklingsstadier og ere da af meget forskjellig Størrelse, 



however, somewhat modified, inasmuch that the cells 

 are more elongate and not so polyhedrical and, between 

 them, a multitude of clavate-formed mucous glands are 

 observed, having an elongated neck which, most frequently, 

 debouches on the inner surface of the gullet (fig. 7. e). 

 These clavate cells are quite similar to the previously 

 mentioned unicellular mucous glands in the ectoderm. 

 but they are more easily observed in the gullet, Avkilst, 

 also, the contents frequently lie, partly inside, and partly 

 outside the aperture of the excretory duct. The inner 

 surface of the gullet is, frequently, coated with a viscous 

 mucous substance. 



The gullet cavity forms an oval channel, which ex- 

 tends itself, a few millimetres from the oblong oral aper- 

 ture, right down to the extremity of the gullet (fig. 7, /). 

 It it furnished with, long, narrow, flagellated cells, each 

 of which carries a long cilium that waves freely in the 

 cavity (fig. 7. g). 



The gastral filaments do not differ in their structure 

 from those spoken of in connection with the genus Yæringia. 

 and from this I can, in a measure, confirm the obser- 

 vations made by the Englishman Edm. Wilson, in respect 

 of the two long dorsal mesenterial filaments. Hoav far 

 these two organs operate, exclusively, in the service of the 

 circulatory system, I am unable to decide, but the cir- 

 cumstance that they follow the ventral cavity throughout its 

 entire length, and are richly clad with long ciliæ, seems 

 to point to this. 



The sexual products develope themselves in the lowest 

 part of the ventral cavity, on the septula, in peculiar 

 capsules. The sexes are separate. In the one specimen which 

 I have had under examination the individuals are females. 



I have previously stated that, everywhere, in the 

 exterior integument of the Zoanthoclem, a multitude of 

 spicules ar found; I shall now describe these more par- 

 ticularly. 



In the basal part, the spicules are placed com- 

 pactly upon each other, and form; partly, foliaceous. 

 partly, wartecl 'clavates with extremely short shaft, and 

 they measure from 0.110 — 0.140""" in length, and from 

 0.060—0.080""» in breadth above (figs. 8. 9. 10); short 

 spicate fusees with blunted extremities, and measuring 

 from 0.060—0.120'"»' in length, and from 0.025—0.040"'"' 

 in breadth ; the smallest ones have few spikes, and have 

 a broad bare mesial belt (fig. 11); small bistellates. 

 measuring 0.052""» in length, and 0.020""" in breadth at 

 the extremities, and 0.010""" in breadth at the middle 

 (fig. 12); large bistellates, with a mesial belt, partly, 

 bare, partly beset with spikes, and measuring 0.112'""' in 

 length, and 0.060'""' in breadth at the extremities; very 

 frequently, the one extremity is broader than the other, 

 and richer in '.spikes (figs. 13. 14. 15). 



On the stem, the bistellate is the most frequent 

 spicular form, and measures from 0.060 — 0.088"'"' in length, 

 and from 0.040 — 0.060""" in breadth at the extremities ; 

 its bare mesial belt measures from 0.016—0.020""" in 

 breadth (figs. 16. 26); they are met with in various stages 



