141 



de to kontinuerende, staa langt fra hverandre, hvoraf Følgen 

 er. at baade de inter- og intrasoptale Kamre blive meget 

 vide, Tal). XXV, Fig. 8 /,-. 11 h. De øvrige ti Par Side- 

 septa, der vende væsentligt mod Dorsalsiden, staa tættere 

 sammen, hvorfor ogsaa Kamrene lier er meget trangere, 

 Tab. XXV, Fig. 8 7, 11 i. De 8 Par Septa, som grup- 

 pere sig paa hver Side af de dorsale og ventrale Retnings- 

 septa, have en Muskulatur, der ikke synes at afvige fra 

 det almindelige. Længdemusklerne ere temmelig meget 

 udviklede og danne tildels henimod Svælgrøret tynde Buske 

 (Faner), Tab. XXV. Fig. 12 //. imedens de transverselle 

 Muskler ere meget tynde, fattige paa Fibre og synes til- 

 dels at være dækkede af Længdemusklerne, som da indtage 

 Septumets begge Sider. 



Samtlige Septa ere, som før nævnt, fuldstændige, det 

 vil sige, de fæste sig alle paa Svælgrøret; ufuldstændige 

 Septa har jeg ikke kunnet opdage paa de Exemplarer. jeg 

 har undersøgt, og naar undtages de 2 Par Retningssepta 

 idorsale og ventrale). saa bære alle de øvrige Mesenterial- 

 filamenter og Generationsorganer. Mesenterialfilamenterne 

 tåge deres Udspring paa Septaerne lige ved deres Inser- 

 tionssteder paa Svælgrorets nederste, fri Ende og følge 

 proptrrekkerforinigt langs Septaernes fri Rand et Stykke 

 nedover denne for at ende omtrent 15""" fra deres Udspring. 

 Tab. XXV, Fig. 13 a. Strax nedenfor, hvor Mesenterial- 

 filamenterne ende, tåge Generationsorganerne deres Begyn- 

 delse; de folge Septumets fri Rand og ligge langs denne 

 som en Perlesnor, indtil nogle Millimeter fra dens Ophør; 

 paa de kontinuerende Septa gik Generationsorganet næsten 

 lige ned til Caudalaabningen. 



Æggestokken danner et fladtrykt Ror, hvori sees Æg 

 i forskjellige Udviklingsstadier, Tab. XXV, Fig. 13 b, 14. 

 Jeg undersøgte paa et Exemplar Kjønsorganet paa hvert 

 eneste Septum, og Resultatet var, at de alle bar kun Ægge- 

 stokke ; dette Exemplar var ikke Hermaphrodit, og paa 

 et Par andre Exemplarer fandt jeg ligeledes kun Ægge- 

 stokke, ikke Spor til Testikler. Heider og Vogt angive, 

 at Cerianthus membranaceus. som er den Art. der er 

 undersøgt af de Forskere, som specielt have beskjæftiget 

 sig dermed, er Hermaphrodit, og jeg håvde derfor ventet 

 at finde det samme Forhold hos min Art; naar nu ikke 

 dette har været Tilfældet, saa kan to Ting tænkes, enten 

 at Testiklerne ei har været saa udviklede. at de lod sig 

 opdage, hvilket jeg imidlertid ikke anser for sandsynligt, 

 eller at Dybvandsformerne af Cerianthus have særskilt 

 Kjøn, medens de øvrige ere tvekjønnede, et Forhold, der 

 ikke er ganske fremmed for de lavere Dyr, nemlig at en 

 Art har særskilt Kjøn og en anden er Hermaphrodit. 



Heider inddeler Septaerne i ..Filamentsepta og Geni- 

 talsepta" ; han har fundet hos Cerianthus membranaceus, 

 at hvert andet Septum bærer Kjonsorganer og hvert andet 



septa. like the two continuing ones, stand far apart from 

 each other, in consequence of which both the interseptal 

 and the intraseptal chambers become veiv wide (Pl. XX\'. 

 fig. 8 /,-, 11 h). The remaining 6 pairs of lateral septa. 

 which principally face towards the dorsal side. stand doser 

 together, so that the chambers here become also much 

 narrower (Pl. XXV, fig. 8 l, 11 i). The 8 pairs of septa. 

 which group themselves upon each side of the dorsal and 

 ventral directive septa. have a musculosity that does not 

 appear to differ from the common. The longitudinal 

 muscles are pretty well developed, and partly form, towards 

 the æsophagus, thin tufts (flags) (Pl. XXV, fig. 12 ln. 

 while the transversal muscles are very thin. poor in fibres 

 and appear to be partly covered by the longitudinal mus- 

 cles, which then occupy both sides of the septum. 



As before mentioned, all the septa are perfect, that 

 is to say they all attach themselves to the æsophagus. I 

 have been unable to detect imperfect septa in the spec- 

 imens I have investigated, and when we except the two 

 pairs of directive septa. (dorsal and ventral). all the others 

 carry mesenterial filainents and reproductive organs. The 

 mesenterial filainents have their origin on the septa, just 

 at their points of insertion on the lowest free extreiuity ut 

 the æsophagus, and follow, spirally, along the free margin 

 of the septa a little way down it, terminating about 15""" 

 from their commencement (Pl. XXV, fig. 13 a). Immedi- 

 ately below the point where the mesenterial filainents 

 terminate. the reproductive organs have their origin ; they 

 follow the free margin of the septum and lie along it 

 like a string of pearls, extending to within a few niilli- 

 metres of its cessation ; upon the continuing septa the 

 reproductive organ extended almost quite down to the 

 caudal aperture. 



The ovaiies form a flattened tube in which ova are 

 observed in various stages of development (Pl. XXV, fig. 13 6, 

 14). In one specimen I investigated the reproductive organ 

 on every individual septum, and the result was that all of 

 thein proved to carry ovaries only. That specimen was not 

 hermaphroditic, and in a couple of other specimens, also, 

 I found ovaries only, not a trace of testicles. Heider 

 and Vogt state, that Cerianthus membranaceous, which is 

 the species that has been investigated by the naturalists 

 who have devoted special attention to the subject, is 

 hermaphroditic, and I had therefore expected to tind the 

 same relation in my species. But when this has proved 

 not to be the case, we may suppose two alternatives; 

 either that the testicles have not been so developed that 

 they were capable of being observed. a thing I do not, 

 however. think probable: or that the deep-water forms 

 of Cerianthus have separate sexes whilst the others are 

 bi-sexual. a relation that is not quite unknown in the 

 lower animals, viz. that one species has separate sexes 

 while another is hermaphroditic. 



Heider distinguishes the septa into .Filamentsepta 



and Genitalsepta- ; he has found in Cerianthus membrana- 

 ceous, that every alternate septum carries reproductive 



