150 



indesluttende Kjernelegemet og omgiven af en mørk Proto- 

 plasmamasse, Tab. XVIII. Fig. 4. Ved Siden af disse 

 Ganglier med deres 3 — 4 Udløbere, Tab. XVIII. Fig. 4 a, 

 vise sig lange Nervetraade krydsende hverandre, og som 

 synes at udgaa fra aflaiige, ganglionære Knuder, der ere 

 rige paa Protoplasma. Tab. XVIII. Fig. 4 b. Nogen 

 Kjerne har det ikke været muligt at opdage i disse Knuder, 

 og det kan hænde, at de kun ere kunstige, varikøse Ud- 

 vidninger. 



Men ikke alene ved Mundskiven iagttages disse 

 Ganglier og Nervefibriller ; de tindes paa flere Steder af 

 Kroppen, endog langt bag paa denne, hvor de vise sig 

 temmelig tydeligt paa meget tynde Tversnit; men tydeligst 

 paa Macerationspræparater, behandlede med svag Osinium- 

 syre. Det forekomme}' mig med temmelig Sikkerhed, at 

 der er et rigt Nervenet med korresponderende Ganglier 

 udbredt over hele Legemet, og vi skulle se, at noget 

 lignende vistnok tinder Sted for Spiserørets og Tarmkana- 

 lens Vedkommende. Paa den øverste Del af Spiserørets 

 indre Flade, imellem Epithelet og Muskellaget, sees et fint 

 Nervenet, Tab. XVIII. Fig. 3. hvis Grene udbrede sig 

 dels til Epithelet. Tab. XVIII. Fig. 3 b. dels til Muskel- 

 laget, Tab. XVIII. Fin. .'i c, og over dette Nervenet ligger 

 spredt store Ganglier med store, runde Kjerner, der inde- 

 slutte et rundt Kjernelegeme, og som ere omgivne af en 

 finkornet Protoplasmamasse, Tab. XVIII. Fig. 3 d. Gang- 

 liecellerne have forskjellig Form, ere mere eller mindre 

 udviklede og udsende flere Udløbere, der ere meget rige 

 paa Protoplasmaindhold. Nogen Forbindelse imellem Gang- 

 liecellerne og Nervenettet har jeg ikke kunnet iagttage, 

 omendskjont det er noksaa rimeligt, at en saadan tindes. 

 Længere nede paa Tarmen sees lignende Nerveudbred- 

 ninger, saa jeg er tilbøielig til at tro. at hele Tarmtrakten 

 er vel forsynet dermed. Paa et Tversnit af den øverste 

 Del af Spiserøret forekom det mig. at der paa dettes ind- 

 vendige Side. indenfor Epithelet og vel dækket af dette, 

 laa en Gruppe mindre, næsten pæreformede Ganglier, der 

 havde en temmelig stor Kjerne med Kjernelegeme; men 

 da de vare temmelig udtydelige, og da der af dette Parti 

 ikke lykkedes at faa brugelige Macerationspræparater, maa 

 jeg indskrænke mig til at antyde, at der paa denne Vei 

 sandsynligvis sker en Xerveudbredning til Septa og de til 

 disse knyttede Organer. 



Findested. 



Station: 173 — 174. Flere Exemplarer, men kun 

 nogle faa (2 Voxne, 1 Unge) vare ubeskadigede. Hos de 

 fleste var Huden revnet paa den forreste Del af Kroppen 

 henimod Mundskiven, og igjennem Revnerne vare Mesen- 

 terialfilamenterne og tildels Generationsorganerne udjagede 

 og laa ganske blottede. 



ganglial cells containing a large, almost round nucleus 

 enclosing the nucleal corpuscle and surrounded by a dark 

 protoplasmic mass (Pl. XVIII, fig. 4). Alongside these 

 ganglia with their 3 or 4 prolongations (Pl. XVIII, fig. 

 4 a), long nerve filaments appear crossing each other. 

 and seem to issne from oblong, ganglial nodules rich in 

 protoplasm (Pl. XVIII, rig. 4 b. It has not been possible 

 to detect any nucleus in these nodules, and it may be, 

 that thev are only artificial varicose dilations. 



But not only on the oral dise are these ganglia and 

 nervous fibrils observed; they are also found upon several 

 parts of the body. even far back upon it. and they show 

 themselves pretty distinctly inverythin transverse sections, 

 but most distinctly in maeerated preparations treated with 

 weak osmic arid. It appears to me. with considerable 

 certainty, that there is a rich nervous reticulation with 

 corresponding ganglia distributed over the whole body, and 

 thai we ought to tind that somtething like it certainly 

 occurs on the gullet-tube and intestina] canal. On the 

 uppermost part of the inner surface of the gullet-tube, 

 between the epithelium and tlie musculous laver, a tine 

 nervous reticulation is observed i Pl. XVIII. fig. 3), whose 

 filaments extend themselves partly to the epithelium (Pl. 

 XVIII. fig. 3 6) aud partly to the musculous laver (Pl. 

 XVIII, fig. 3 c), and over tliis reticulation He scattered, 

 large ganglia with large, round nuclei enclosing rouni 

 nucleus-corpuscles, surrounded by a finely granular proto- 

 plasmic mass Pl. XVIII, fig. 3 d). The ganglial cells have 

 various forms, are more or less angular and project 

 several prolongations. which are Very rich in protoplasmic 

 contents. 1 have not been able to detect any connection 

 between the ganglial cells -and the nervous reticulation. 

 although it is sufficiently probable that such a connection 

 exists. Farther down the intestine similar nervous distribu- 

 tions are seen, so that I am disposed to believe, that the 

 entire intestinal tube is will supplied with them. In a 

 transverse section of the uppermost part of the gullet, it 

 appeared, to nu-, that upon its exterior side. inside of 

 tlie epithelium and well covered by it, there lav a group 

 of small, almost piriform ganglia, which had a pretty 

 large nucleus with nucleus-corpuscle: but as they were 

 rather indistinct, and 1 did not succeed in obtaining from 

 this part satisfactory maeerated preparations. ] must con- 

 fine myself to indicating, that probably in that way a 

 nervous distribution takes place to the septa and to the 

 organs attached to them. 



Habitat. 



Stations No. 173 and 174. Several specimens but 

 only a few of them (2 adult and 1 young) were brought 

 up undamaged. ln most of them the integument was torn 

 on the anterior part of the body towards the oral disc, 

 and through the rifts the mesenterial filaments. and partly 

 also the reproductive organs, were forced out and lav quite 

 exposed. 



