LO 



Der er omkring 18 Par fuldstændige Septa. som alt- 

 saa deler Gastralhulheden i 18 Hovedkamre. Disse Septa 

 have saa stærkt udviklede Længdemuskler, at de saagodt- 

 som ganske udfylde Kamrene. Længdemusklerne, der ligge 

 paa den ene Side af hvert Septum (paa den indre .Side, 

 naar undtages de 2 Retningssepta, hvor de ligge paa den 

 ydre Side) danne her en Samling af tine Folder, som frem- 

 komme derved, at der fra Septum ndgaar en Mængde tine. 

 forgrenede Bindevævsforlængelser, Tab. IX, Fig. 8 d, paa 

 hvilke Musklerne ere festede, Tab. IX, Fig. 8 e. Læng- 

 demusklerne paa Kroppens indvendige Væg ere ogsaa tem- 

 melig stærkt udviklede og bidrage sandsynligvis til at danne 

 de før beskrevne, brede Folder. Tvermusklerne paa Septa 

 ere mindre udviklede. Tab. IX. Fig. 8 /. 



Det er mig ikke muligt med Bestemthed at angive, 

 hvormange Par Septa af 2den Orden der tindes, trods al 

 anvendt Møie; men saavidt jeg har kunnet iagttage, er der 

 2 Par ufuldstændige Septa i hvert Hovedkammer, altsaa 

 36 i det Hele, hvilke ere yderst smale og temmelig korte. 

 Om der er flere Septa., skal jeg ikke kunne si^e. — jeg 

 har ikke fundet flere. 



Paa de principale, fuldstændige Septapar ere saavel 

 Mesenterialfilamenter sum Kjonsorganer festede. Disse 

 sidste ere kun lidet udviklede, indeholde enkelte Æg og 

 sees kun paa enkelte Septa næsten nede imod Bunden af 

 Gastralhulheden. Parieto-basilarmuskelen er meget bred 

 og bestaar af stærke Muskelbundter, som strække sitt: op 

 til Midten af Kroppen og nedover den dybe [ndsnøring, 

 der tindes strax ovenfor Fodskiven, hvor den bliver tyn- 

 dere, for vifteformigt at udbrede sii; paa tien indre Flade 

 af Fodskiven. Den paa Kroppens ydre Flade omtalte Ind- 

 snøring har paa den indre Flade et tilsvarende Fremspring, 

 der gjor Mavehulheden trang paa dette Sted. 



Svælgrøret ei- meget langt, imellem 18 — 20 mra , har 

 sta>rke Længdefolder og 2 forholdsvis brede Svælggruber. 



Udvendigt er det beklædt med Kamrenes Endothel. inden- 

 for hvilket er et temmelig bredt Bindevæv, Tab. IX. Fig. 

 8 g. Fra dette udgaar listeformige Forlængelser, der ere 

 beklædte med et bredt Lag lange, cilierende Cylinderceller. 

 lig Eetodermcellerne, Tab. IX, Fig. 8 /. Imellem dem 

 sees en Mængde Pigmentceller, som indeholde intens brune 

 Pigmentkorn. der give hele den indre Svælgflade en mørk, 

 kastaniebrun Farve, Tab. IX, Fig. 8 h; desforuden sees i 

 Svælgepithelet en stor Mængde encellede, flaskeformede Slim- 

 kjertler, som dels ere ganske tomme, dels niere eller mindre 

 fyldte med en finkornet Masse, der omgiver en temmelig stor 

 Kjerne, Tab. IX, Fig. 8 i. Denne kommer forst tilsyne, naar 

 en stor Del af tien kornede Masse er udtomt; endelig iagt- 

 tages en Mængde Nematocyster, hvoraf de Heste ere kol- 

 beformede med en sammenrullet Sprialtraad, imedens andre 

 ere spydformede, Tab. IX, Fig. 8 k. 



There are about 18 pairs of perfect septa. which 

 consequently divide the gastric cavity iuto 18 prineipal 

 ehambers. These septa have such strongly developed long- 

 itudinal muscles that thev almost entirely iill up the 

 .ehambers. The longitudinal muscles which lie on the one 

 side of each septum (on the inner side. exce.pt in the case 

 of the 2 directive septa. where thev lie on the outer side) 

 form, here. a collection of fine folds, that are produced 

 by the issuing from the septum of a multitude of fine, ram- 

 ificated, connective-tissue prolongations (Pl. IX. fig. * il) 

 on which the muscles are secured (Pl. IX. flg. 8 e). The 

 longitudinal muscles on the interior wall of the body are 

 also rather strongly developed, and probably contribute to 

 form the previously described Innad folds. The transver- 

 sal muscles on the septa are less developed (Pl. IX. hu. 8/). 



It is not possible for me to say, definitely, how 

 many pairs of septa of the 2nd order there are, notwith- 

 standing all possible labour, but, so far as I have been 

 able to observe, there are tw.o pairs of imperfect septa in 

 each prineipal chamber, therefore 36 altogether, which are 

 extremely narrow and rather short. Whether there are 

 additional septa. 1 cannot say; I can ouly say that I have 

 not tound moii'. 



On the prineipal, perfect, pairs of septa, both the 

 mesenterial fllaments as well as also the reproductive organs 

 are attached. These lasl are only Little developed. contain 

 few ova, and are observable only on some septa. almost 

 quite at the bottom of the gastric cavity. The parieto-bas- 

 ilar muscle is very broad, and consists of strong musculous 

 fasciculi that extend themselves up to the middle of the 

 body and down the deep constriction found immediatebj 

 abové the pedal disc, where it beeomes thinner and distri- 

 butes itself, in uabelliform, on the inner surface of the 

 pedal dise. The constriction on the exterior surface of the 

 body. previously mentioned, has, on its inner surface, a cor- 

 responding projection, which makes the gastric cavity 

 contracted at that spot. 



The cesophagus is very long, between 18 — 20""", has 

 strong longitudinal folds, and 2 relatively broad gullet- 

 grooves. Externally it is clad with the endothelium of the 

 ehambers. inside of which there is a rather broad connec- 

 tive-tissue (Pl. IX, fig. 8 g). From this, fillet-formed pro- 

 longations issue, which are clad with a broad laver of long 

 eiliating evlinder-cells resembling the ectoderm-cells (Pl. IX. 

 fig. 8 l). Between them a multitude of pigment-cells are 

 observed, containing intense-brown pigment-granules, which 

 give the entire inner surface of the gullet a dark chestnut- 

 brown colour (Pl. IX. fig. 8 h). There are also seen in the 

 gullet epithelium, a great multitude of unicellular, bottle- 

 shaped, mucous glands, which are partly quite empty, 

 partlyj more or less filled with a minutely granular mass 

 surrounding a rather large nucleus (Pl. IX, fig. 8 i). This 

 beeomes flrst visible after a large part of the granular 

 mass is emptied out. Finally, a multitude of nematocysts 

 are observed. of which the greater number are claviform, 

 with a coiled up spiral thread, whilst others again are 

 hastiform (Pl. IX. fig. 8 k). 



