76 



Fig. 62, a. I cle ydre Lag er Celleindholdet kun ringe, 

 i cle indre derimod rigere, fintkornet og skjuler tildels 

 Kjernen, Fig. 62, b. I de indre Lag ere Cellerne hyppig 

 mere aflange, ikke saa kantede, have et tættere Protoplasma- 

 indhold, og her iagttages dels enkeltvis, dels mere samlede, 

 kolbeformige Legemer med en lang Hals, der strækker sig 

 op imellem de polyædriske Celler indtil Ectodermets Over- 

 flade. Fig. 62, c. Disse kolbeformige Legemer have et 

 kornet Indhold, der hyppig skjuler ganske den temmelig store 

 Kjerne; de ere encellede Slimkjertler med Udførselsgang. 

 Det lykkes ikke saa ganske sjeldent at kunne se Indholdet 

 ligge dels i Udførselsgangens Aabning, dels udenfor samme, 

 og da træder Kjernen meget tydelig frem, idet Cellen 

 forresten er ganske tom. I de indre Lag af Ectodermet, 

 lige paa GTrændsen imellem dette og Bindevævet, sees 

 Spiklerne indleirede; de ere omgivne af Epithelet, hvilket 

 bedst iagttages, naar cle ere fjernede; paa Randen r af cle 

 tomme Rum, som de efterlader, sees nemlig de mere aflange 

 Ectodermceller med deres Kjerne, Fig. 62, d, og det er 

 meget sandsynligt, at disse Celler have en væsentlig Andel 

 i Spikeldannelsen. Indenfor Ectodermet er et overordent- 

 lig bredt, hyalint Bindevævslag, Fig. 62, e, hvori findes en 

 Mængde ISTutritionskanaler, forsynede med Epithel, Fig. 

 62, /, samt Bindevævslegemer med Udløbere, Fig. 62, g ; 

 ogsaa her korrespondere Binclevævslegemerne ikke alene 

 med hverandre indbyrdes, men ogsaa med de fine Nutri- 

 tion skån aler. 



Fra Binde væ vets indre Flade udgaa temmelig brede 

 Forlængelser, der danne de store Kanaler, hvori Polyperne 

 aabne sig. , Disse Kanaler ere i Forhold til Polypernes 

 Antal kun ringe ; saaledes have de store Grene i Regelen 

 kun 6 — 7 saadanne Kanaler, Fig. 63, a, imedens der paa 

 Grenen kan sidde et halvt Hundrede og flere Polyper. 

 Den bilaterale Symetri, som tidligere er omtalt, kommer 

 ogsaa tilsyne i det hyaline Bindevævslag, idet Ryg- og 

 Bugsiden paa Stammen har et overmaade bredt Bindevæv, 

 hvori Kanalerne staa langt fra hverandre, imedens dette 

 paa Sidedelene, hvor Grenene udspringe, er betydeligt smalere. 

 Ligesaa forholder det sig med Grenene ; her, hvor Poly- 

 perne i Regelen udspringe paa to Sider, er Bindevævet 

 meget smalere, Fig. 64, a, end paa de Steder, der svare 

 til Bug og Ryg paa Stammen, Fig. 64, b. Paa den indre 

 Flade af det hyaline Bindevæv ligger Muskellaget, bestaaende 

 af Længde- og Tverfibre, der ere ordnede paa den sædvan- 

 lige Maacle, og som er beklædt med et Epithel, dannet 

 af runde Celler, 0.008"™ i Diameter, med store Kjerner. 

 Xutritionskanalerne ere ligeledes beklædte med et Epithel, 

 hvis Celler ere mere aflange, og som ganske udfylde 

 Lumenet i de fineste Kanaler. 



0.004"™ in diameter, containing one, and sometimes two 

 nucleolei (fig. 62, a). In the exterior layer the cellular 

 contents is only thin ; in the inner layer it is, on the other 

 hand, richer, and minutely granular, and partly conceals the 

 nucleus (fig. 62, 6). In the interior layers the cells are, 

 frequently, more oblong and not so polyhedrical, and they 

 contain a more dense protoplasmic substance. I observed 

 here, partly single, and partly grouped together, clavate- 

 formed bodies with a long neck, extending up between 

 the polyhedrical cells until they reach the outer sur- 

 face of the ectoderm (fig. 62, c). These clavate-formed 

 bodies contain a granular substance that frequently con- 

 ceals the rather large nucleus; they are unicellular 

 mucous glands with an excretory duct. It happened, not 

 so very seldom, that the contents might be observed lying, 

 partly, in the aperture of the excretory duct, and 

 partly, outside of it, and when this was the case the 

 nucleus appeared very distinctly, as the cell is otherwise 

 quite empty. In the interior layers of the ectoderm, 

 exactly at the margin betAveen it and the connective-tissue, 

 the spicules are seen to be entrenched, and are enclosed 

 by the epithelium ; this is best observed on removing them, 

 because on the margin of the vacant space which they 

 leave, the more oblong ectoderm cells with their nuclei 

 may be observed, (fig. 62, cl) and it is very probable that 

 these cells play an essential part in the spicular formation. 

 Inside of the ectoderm, there is an extremely broad layer 

 of hyaline connective-tissue (fig. 62, e) in which a multi- 

 tude of nutritory ducts furnished with epithelium are found, 

 (fig. 62, _/) and further, connective-tissue corpuscles with 

 prolongations (fig. 62, g) and here, also, the connective-tissue 

 corpuscles correspond, not only with each other recipro- 

 cally, but also with the minute nutritory ducts. 



From the inner surface of the connective-tissue, 

 rather broad prolongations proceed; these form the large 

 ducts into which the polyps open. These ducts are, in 

 relation to the number of the polyps, not numerous ; the 

 large branches have, for instance, usually, only 6 — 7 such 

 ducts (fig. 63, a) whilst, there is space on the. branch for 

 a half hundred, or more, polyps as well. The bilateral 

 symmetry, which has been, previously, mentioned, becomes, 

 also, apparent in the layer of hyaline connective-tissue, 

 because, the dorsal and ventral sides of the stem have an 

 extremely broad connective-tissue, in which the ducts are 

 situated far apart from each other, whilst, upon the lateral 

 parts, where the branches have their roots, it is greatly 

 narrower. A similar thing occurs in the case of the 

 branches; in these, where the polyps project, the connec- 

 tive-tissue is usually, upon two sides, somewhat narrower 

 (fig. 64, a) than it is on the other sides corresponding to 

 the ventrum and dorsum of the stem (fig. 64, b). The 

 muscular layer is situated on the inner surface of the 

 hyaline connective-tissue and consists of longitudinal and 

 transversal fibres, disposed in the usual manner and clad 

 with an epithelium formed of cylinder-cells measuring 

 0.008""" in diameter, and containing large nuclei. The 

 nutritory ducts are, likewise, clad with an epithelium, 



