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Anatomisk-histologisk Undersøgelse. 



Stammen og Grenene ere paa deres udvenclige Flade 

 forsynede med Epithel, der bestaar af 2 Lag polyædriske 

 Celler, som med sin Kjerne og Kjernelegeme indeholder 

 kun sparsomt en halvgjennemsigtig, næsten homogen Proto- 

 plasmamasse, Fig. 3, a. 4, a, Imellem Ectoderm cellerne 

 sees, foruden Spikier, isolerede, pæreformige, encellede 

 Slimkjertler, dels med et kornet Indhold, der omgiver 

 Kjernen, dels ganske tomme, af Udseencle som Vacuoler. 

 Indenfor Ectodermet er et ganske eiendommeligt, hyalint 

 Bindevæv, hvis ydre Lag danner et fuldstændigt Næt med 

 store Masker, hvori Spikier ere afleirede, Fig. 3, b. 4, b, 

 og hvis indre Lag udgjør et temmeligt bredt Belte, hvori 

 sees fine Ernæringskanaler og Bindevævslegemer, og fra 

 hvis indre Flade udsendes Forlængelser, der danne Skille- 

 væggene for Kanalsystemet eller det egentlige Coenenchym, 

 og hvori findes en hel Del Spilder, Fig. 3, cl. De store 

 Maskers Vægge ere beklædte med Ectodermceller, saaledes 

 at Spiklerne, som udfylde Maskerne, ere omgivne af dem, 

 Fig. 4, c. Paa den indre Flade af Bindevævet, der danner 

 de store Kanaler, findes paaskraas- og paalangsgaaende 

 Muskelfibre, som paa "Septula samle sig til Muskelbunter, 

 der paa den ene Side danne Længde- og paa den anden 

 Tvermuskler, hvilke følge Septula i deres hele Længde for 

 at gaa over paa Septa hos de Polyper, som staa i umid- 

 delbar Forbindelse med saadanne Kanaler, der i saa Til- 

 fælde udgjøre Polypernes forlængede Mavehulheder. Der 

 er kun faa af disse Kanaler, og ret ofte findes langt nede 

 i dem Generationsorganerne med fuldt (udviklecle Kjøns- 

 produkter. 



Stammens og Grenenes Længdekanaler ere i det Hele 

 tåget faa i Forhold til Polypernes Antal; saaledes samler 

 den øverste Polypgruppe sig i 4 meget vide Hovedkanaler 

 ligesom Grenenes Polyper samle sig i 2 — 3, alt efter Grenens 

 Tykkelse og Polypernes Antal. Fig. 3. For hver Krands 

 af Grene faar Stammen en Tilvæxt af Længdekanaler, som 

 dog blive trangere og trangere, jo mere de nærme sig 

 Basaldelen. Kanalerne ere tapetserede med et Endothel, 

 der bestaar af et Lag runde Celler med Kjerne og Kjerne- 

 legeme. De runde Legemer, som indeholdes i den i 

 Kanalerne cirkulerende Ernæringsvædske, have dels samme 

 Form, Størrelse og Indhold som Endothelcellerne, dels ere 

 de noget forskjellige fra disse, idet de ere fyldte med en 



and has an oblong oral fissure. The tentacles measure 

 3 — 4""" in length, and are pretty thick at the base, and, 

 on their aboral side, are sheathed with spicules. The 

 pinnules are placed pretty close to each other, and they 

 are thick and furnished with spicules (fig. 2). 



Anatomo-histological Examination. 



The stem and the branches are — upon their exter- 

 ior surfaces — furnished with an epithelium which con- 

 sists of 2 layers of polyhedrical cells, that besides their 

 nucleus and nucleolar corpuscles, contain, but sparingly, 

 a semi-transparent, almost homogeneous protoplasmic mass 

 (figs. 3, a. 4, a). Between the ectoderm-cells there is, also, 

 observed, besides spicules, isolated, piriform, unicellular 

 mucous glands containing, partly, a granular substance 

 which surrounds the nucleus, and, partly quite empty, 

 and which have the appearance of vacuoli. Inside of 

 the ectoderm, there is a quite peculiar hyaline connective- 

 tissue, whose exterior layer forms a complete reticulation 

 of large meshes in which the spicules are embedded 

 (fig. 3, b. 4, &), and whose inner layer forms a pretty 

 broad stripe, in which minute nutritory ducts and connec- 

 tive-tissue corpuscles are observed, and from whose inner 

 surface prolongations issue forming the divisional walls 

 of the ductiferous system, or the sarcoso ma-proper, and in 

 which there is found a great number of spicules (fig. 3, d). 

 The walls of the large meshes are clad with ectodermic 

 cells in such a manner, that the spicules which fill out 

 the meshes are surrounded by them (fig. 4, c). On the 

 inner surface of of the connective-tissue which forms the 

 large ducts, muscular fibres are found, running diagon- 

 ally, and longitudinally, and which, on the septula, 

 collect into bundles of muscles, that on the one side 

 form longitudinal, and on the other side transversal, muscles, 

 accompanying the septula throughout their entire length 

 and then passing over to the septa of such polyps as are 

 placed in immediate connection with those ducts, and in 

 that case they compose the prolongated gastral cavities of 

 the polyps. There are not many of these ducts, and very 

 frequently, far clown in them, the reproductive organs are 

 met with, containing fully developed sexual products. 



The longitudinal ducts of the stem and the branches 

 are, upon the whole, few in number in proportion to those 

 of the polyps ; for instance, the uppermost polyp group 

 collects itself into 4 very wide main ducts, whilst, also, * 

 the polyps of the branches collect themselves into 2 — 3 

 ducts, according to the thickness of the branches and the 

 number of the polyps (fig. 3). For every wreath of bran- 

 ches the stem acquires an addition of longitudinal ducts, 

 which however become narrower and narrower the nearer 

 they approach to the basal part. The ducts are lined 

 with an epithelium, consisting of a layer of round cells 

 containing nucleus and nucleolus. The globular corpuscles 

 which are contained in the nutritory fluids circulating in 



