115 



I Kanalernes Skillevægge er der Længderækker af 

 Spikier, som ere i størst Mængde tilstede, der hvor Skille- 

 væggen tager sit Udspring fra den indre Væg af Binde- 

 vævet; men ogsaa paa Midten af Skillevæggen sees smaa, 

 spredte Spikier. Polyperne ere paa deres ydre Flade be- 

 klædte med et Epithel. som bestaar af 2— 3 Lag polyædriske 

 Celler. Fig. 6, a, lig dem. som fmdes paa Stammen og 

 G-renene, og imellem disse Celler iagttages encellede Slim- 

 kjertler, der dog ere temmelig sparsomme. Indenfor Ecto- 

 dermet er et hyalint Bindevævslag med sine Bindevævs- 

 legemer samt Nutritionskanaler, og fra hvis indre Væg ud- 

 gaa de sædvanlige 8 Septa, der fæste sig paa Svælgets 

 ydre Væg, Fig. 7, a. I Ectodermet og det ydre Lag af 

 Bindevævet ere Spiklerne leirede. Fig. 6, &; i Septa el- 

 ingen saadanne. 



Svælget er næsten cylindrisk; dets ydre Flade er 

 beklædt med Epithel, dannet a f et Lag runde Celler med 

 en rund Kjerne og Kjernelegeme, Fig. 6. c; fuldkommen 

 lig disse Celler, der ogsaa beklæde Kamrene, sees andre 

 Celler, liggende isolerede indeni Kamrene, og som synes at 

 tilhøre den Ernæringssaft, der gjennemstrømmer Kanalerne, 

 Fig. 6, cl. Jeg har næsten bestandig iagttaget, at den 

 Væclske, som tindes i Kamrene og i cle store Kanaler, 

 indeholder Celler, der have saa særdeles meget tilfælles 

 med de Endothelceller. som beklæde dem. at de synes at 

 være et Produkt af dem, med andre Orel, at Saftcellerne 

 dannes af Endothelet. Indenfor Epithelet er et hyalint 

 Bindevævslag, som paa Bugsiden danner flere listeformige 

 Fremspring, der rage ind i Svælghulheden, Fig. 6, e. 7, &; 

 saavel disse, som den øvrige Del af Bindevævets indre 

 Flade. er beklædt med Epithel, der er Svælgets Epithel og 

 som bestaar af et Lag lange, cylindriske Celler, forsynede 

 med Cilier, Fig. 7, c. Langs Svælgets Bugside er Svælg- 

 renden, der her har flere Fremspring eller Folder, som 

 rage temmelig langt ind i Hulheden, og der, hvor Svælg- 

 gruben til Siderne ophører, er en Indsnøring, eler ligesom 

 deler Svælget i to Længdehulheder, Fig. 7, cl] den ene, 

 som følger Bugsiden, er Svælggruben med sine store Folder, 

 Fig. 7, e, og den anden, som følger Rygsiden, er uden 

 synderlige Folder og kan, naar Svælgrenden er lukket, be- 

 tragtes som Tarm, Fig. 7. /. Svælgrenden )har meget 

 lange Cylinderceller, der hver er forsynet med en lang 

 Pidsk, Fig. 6, f, fuldkommen lig dem, som tidligere have været 

 beskrevne. 



Det synes ikke at være tvivlsomt, at Svælggruben her 

 virker som virkelig Øsophagus og lukker sig, saasnart den 

 har ført ind i Maven de til Ernæringen nødvendige Føde- 

 midler, imedens den anden Del af Svælget, Rygpartiet, 



found in the inner cellular layer of the epithelium. Where 

 spicules are present in the connective-tissue, there is always 

 a depression of the cells of the ectoderm, so that these sur- 

 round them. 



In the divisional walls of the ducts, there are longi- 

 tudinal series of spicules, which are present in greatest 

 number at the point where the divisional walls issue from 

 the inner wall of the connective-tissue, but scattered spi- 

 cules are, also, observed in the middle of the divisional 

 wall. The polyps are, upon their exterior surface, clad 

 with an epithelium which consists of 2 — 3 layers of poly- 

 hedrical cells (fig. 6, a) similar to those found on the 

 stem and the branches, and. between these cells, unicellular 

 mucous glands are observed, which hoAvever are rather 

 rare; inside of the ectoderm, there is a layer of hyaline 

 connective-tissue, with its connective-tissue corpuscles and 

 nutritory ducts, from whose inner wall, the usual 8 septa 

 issue and attach themselves to the external wall of the 

 gullet (fig. 7, a). The spicules are embedded (fig. 6, b) 

 in the ectoderm and the outer layer of connective-tissue. 

 There are no spicules in the septa. 



The gullet is almost cylindrical; its outer surface is 

 clad with epithelium, formed of a layer of cylinder-cells 

 containing a round nucleus and nucleolus (fig. 6, c); other 

 cells, exactly similar to those cells which, also, clothe the 

 chambers, are seen, placed isolatedly, within the chambers, 

 and these appear to pertain to the nutritory fluid that flows 

 through the ducts (fig. 6, d). I have, almost invariably, 

 observed that the fluid which is found in the chambers, and in 

 the large ducts, contains cells which have such very particular 

 resemblance to the endothelial cells that clothe the ducts, 

 that they appear to be a product of them — in other words, 

 that the cells of the fluid are formed from the endothelium. 

 Inside of the epithelium, there is a hyaline connective- 

 tissue layer which, on the ventral side, forms several fillet- 

 formed prominences that project into the gullet-cavity; 

 (fig. 6, e, 7. b) both, these, as well as the remaining part 

 of the inner surface of the connective tissue, are clad with 

 an epithelium, which is the epithelium of the gullet, and 

 consists of a layer of long, cylindrical cells, furnished with 

 eiliæ (fig. 7, c). The gullet-passage appears along the 

 ventral side of the gullet, and has, here, several prominen- 

 ces, or folds, which extend pretty far into the cavity, and 

 at the point where the gullet-cavity, at the sides, ceases, 

 there is a constriction which, as it were, divides the gullet 

 into two longitudinal cavities (fig. 7. d) — the one, of these, 

 which runs along the ventral side is the gullet-cavity with 

 its large folds (fig. 7, é). and the other, which runs along 

 the dorsal side, has no particular folds, and may, when the 

 gullet-passage is closed, be considered as an intestine 

 (fig. 7, J). The gullet-passage has very long cylinder-cells, 

 each of which is furnished with a long flagellum (fig. 6, f) 

 exactly like those which have been previously described. 



It does not appear to be doubtful, that the gullet 

 cavity, here, operates as a genuine oesophagus, and closes 

 itself as soon as it has passed the necessary nourishment 

 into the stomach, whilst the other division of the gullet — 



15* 



