114 



omtrent som paa Scapus, men tie mangle Overtrækket; 

 Papilleme stua noget mere spredte, Tab. XIX. Fig. 8 «, 

 især paa Pinsa; dog er Ectodermet meget rigere paa 

 Nematocyster. 



Fra Kroppens indre Væg udgaa 8 Septa, der paa 

 Physa ere meget smale, men blive alt bredere og bredere, 

 jo længere de naa frem mod Mundskiven. paa. hvis indre 

 Flade og Svælgrørets ydre Væg de fæste sig. hvorved den 

 forreste Del af Gastrovascularhulheden, saalangt som Svælg- 

 roret rækker, deles i 8 Kamre. Disse Septa. der i Midten 

 beståa af en temmelig fast Bindevævsmembran, Tab. XIX, 

 Fig. 8 b. der er Fortsættelse af Hudens Bindevæv, synes 

 paa begge Sider at være beklædte med Tver- og Længde- 

 muskler, hvoraf de sidste ere meget udviklede, især ved 

 Septumets Udspring fra Kropsvæggen og dets Befæstning 

 paa Svælgrøret, hvor de paa begge Steder forme sig i 

 tykke Buske. Tab. XIX. Fig. 8 c, cl; Fig. 9 a. Paa Midten 

 af Septuinet, det vil sige imellem Kropsvæggen og Svælg- 

 røret, ere Længdemusklerne meget tynde og danne her ikke 

 de sædvanlige Buske, Tab. XIX, Fig. 8 e. Samtlige Septa, 

 bære Mesenterialfilamenter, der tåge deres Begyndelse fra 

 den nedre Ende af Øsophagus, strække sig bag mod Physa 

 og frembyde intet særegent, [ndenfor dem. nemlig imellem 

 dem og Længdemusklerne, ligge Grenerationsorganerne. 



Æggestokkene ligge Qærmest Mesenterialfilamenterne, 

 danne slangeformige, noget fladtrykte Ror, der indvendig 

 ere beklædte med runde Epithelceller, hvori Æggene ud- 

 vikle sig, Tab. XIX, Fig. 9 b. Disse laa dels to ved Siden 

 af hinanden, dels enkeltvis, og vare i forskjellige Udviklings- 

 stadier. Ved Siden af Æggestokkene ligge Testiklerne, 

 som ormformig slynge sig bagover, saalangt Æggestokkene 

 række. De ere sammensatte af tynde. temmelig lange 

 Blindsække, der indvendig ere beklædte med runde Epithel- 

 celler, hvori sees flere punktformige Legemer (Spermato- 

 zoer?). Saavel Æggestokkene som Testiklerne ere udvendig 

 beklædte med et cilierende Oylinderepithel. Men foruden 

 disse Organer bære Septa Acontier. der især paa den 

 bagre Del, henimod Physa, ere temmelig hyppige og hænge 

 frit i Gastrovascularhulheden, Tab. XIX, Fig. 9 c. 



Øsophagus, der er omtrent en Trediedel saa lang som 

 det hele Legeme, er cylindrisk, paa den ydre Flade delt i 

 8 Felter ved Septainsertionerne og beklædt med huie. 

 cilierende Cylinderceller. Indenfor dette Epithel er et 

 stærkt udviklet Muskellag, bestaaende af Tver- og Længde- 

 muskler, hvilke ligge fæstede til det temmelig brede Binde- 

 væv, fra hvis indre Væg udgaa Forlængelser, der rage ind 

 i Svælget og danne Folderne paa den indre Svælgvæg, som 

 er beklædt med et tykt Epithel. Ingen Svælggrube. 



capitulum and physa the structure of the integument is 

 about the same as that of the scapus, but they are defi- 

 cient in the covering; the papillæ are placed far more 

 dispersed (Pl. XIX. fig. 8 a), especially on the physa, 

 but the ectoderm is much richer in nematocysts. 



From the inner wall of the body 8 septa issue. which 

 air very narrow on the physa but become broader and 

 broader according as they extend forward towards the 

 oral disc, ujion whose inferior surface and the outer wall 

 of the gullet-tube they attach themselves, causing the 

 anterior portion of the gastro-vaseular cavity. as far as 

 the gullet-tube extends, to be divided into 8 chambers. 

 These septa. which in the middle consist of a. rather 

 firm connective-tissue membrane (Pl. XIX, fig. 8 h). a pro- 

 longation of the connective-tissue of the integument, appear 

 to be covered, on both sides, with transversal and longi- 

 tudinal muscles. of which the last-named are very devel- 

 oped. especially at the origin of the septum on the wall 

 of the body and the attachment to the gullet-tube, where 

 they. mi both sides, fonn themselves into thick tufts (Pl. 

 XIX. flg. 8 c, cl: fig. 9 a). At the middle of the septum, 

 that is to say between the wall of the body and the gullet- 

 tube, the longitudinal muscles are verv thin and do not 

 form. heiv. the usiial tufts (Pl. XIX, fig. 8 e). All the 

 septa carr\ mesenteria] tilaments that have their origin 

 in the lower extremity "l' the æsophagus, extending them- 

 selves backwards towards the physa. but presenting nothing 

 special of note. To the inside of them — that is between 

 them and the longitudinal muscles — lie the reproductive 

 organs. 



Tlie ovaries lie next to the mesenterial filaments, and 

 form serpentine, somewhat flattened tubes, which are clad 

 internally with round epithelial cells in which the ova de- 

 velope themselves (Pl. XIX. fig. 9 /')• These lav partly 

 two alongside each other, partly singly, and appeared in 

 various stages of development. The fcesticles lie at the 



side of the n\;|]'ies. ;i Ilt 1 twilie themselves. ill Vermifomi, 

 backwards, as far as the ovaries extend. They are com- 

 posed of thin, rather long cæca, clad internally with round 

 epithelial cells in which several dotted corpuscles are visible 

 (spermatozoa). The ovaries as well as the testicles are 

 clad externally with a ciliating cylinder-epithelium. lint 

 besides those organs the septa. also carry acontia, which, 

 especially on the posterior part, towards the physa, are 

 rather numerous and hang freely in the gastro-vaseular 

 cavity (Pl. XIX. fig. 9 c). 



The æsophagus is about a third-part of the length 

 of the Imdy. and cylindrical; on its outer surface it is 

 divided into 8 areas by the insertions of the septa, and 

 is covered with high. ciliating cylinder-cells. Inside this 

 epithelium there is a strongly developed muscular laver, 

 consisting of transversal and longitudinal muscles that 

 lie secured to the rather broad connective-tissue, from 

 whose inner wall prolongations issue and extend into the 

 æsophagus, forming the folds on the inner wall of the 

 æsophagus; this last is clad with a thick epithelium. No 

 gullet-groove. 



