15 



lede Opmærksomheden paa enkelte Særégenheder ved Ba- 

 thycrinus Carpenteri 



Stilken er udvendig beklædt med en rderst tynd, 

 hyalin, strukturløs Outicula, indenfor hvilken er et Lag 

 Epithel. dannet af temmelig regelmæssige, kubiske Celler 

 med et kornet, plasmatisk Indhold og en næsten centrallig- 

 gende. rund Kjerne med sit Kjernelegeme. Indenfor Epi- 

 thelet og overtrukket af dette findes det egentlige Kalk- 

 skelet. som er sammensat af de tidligere omtalte Led, 

 dannet af stærke Bindevævsnet, i hvis Masker Kalken er 

 afleiret, Tab. III, Fig. 9 a. Imellem Leddene findes stærke, 

 elastiske Fibre, der binde Leddene sammen, Tab. III, Fig. 

 9 b. men paa samme Tid bidrage til at gjøre Stilken tem- 

 melig boielig. Naar det netformede Bindevæv nærmer sig 

 Stilkens Oentraldel, antager det en tættere og fastere Form, 

 hvorved dannes en temmelig fast Membran, Tab. III, Fig. 

 9 c, lu a, der beklæder hele Centralaxen og kan betragtes 

 som en Skede for det indenfor værende Kar. Dette be- 

 staar af en tynd Membran, hvis indre Væg er beklædt 

 med et Epithel, dannet af temmelig smaa, næsten runde 

 Celler med deres Kjerne og Kjernelegeme, Tab. Ill, Fig. 

 9 d, 10 b; Tab. IV, Fig. la, og paa hvis ydre Væg, imel- 

 lem denne og Skeden, findes Nervefibriller og spredte 

 Ganglieceller, Tab. III, Fig. 9 e. 10 e. I Karrets Lumen 

 cirkulerer en Vredske, der indeholder klare, runde Legemer 

 med et kornet Indhold, Tab. III, Fig. 9 f. lOd, og som 

 efter Doden samler sig i større eller mindre Klumper. Tab. 

 IV, Fig. 1 li. Nerveforgreningen strækker sig langs Karret, 

 beklæder dette til omtrent Midten af den nederste Fjerde- 

 del af Stilken, hvorefter den bliver mere spredt og yderst 

 vanskelig at iagttage; i Hødderne er den ganske forsvunden, 

 ligesaalidt som der i disse kan iagttages noget Kar, ime- 

 dens dog de smaa, runde, klare Legemer med kornet Ind- 

 hold tindes der. men sparsommere end i Centralkarret. 

 Dette lober nu uforandret op imod det femkamrede Organs 

 nedre Forlængelser, hvormed det forener sig. 



Det femkamrede Organ er placeret i den nederste 

 Halvdel af Calyx og dannes af en fast Bindevævsmembran, 

 hvis udvendige Væg er ved Bindevævstraade fæstet til Ca- 

 lyxvæggen, og fra hvis indre Væg udgaa vifteformigt mod 

 Centrum 5 Skillevægge, Tab. IV, Fig. 2 a, som forener sig 

 indad og danner derved Centralkanalen, Tab. IV, Fig. 2 b, 

 hvori det saakaldte Dorsalorgan findes. Opad forlænger 

 det kamrede Organ sig i 5 smale, pølseformiae Blindsække. 

 der følge Dorsalorganet op imod 2det Radiale, og nedad 

 forlænger det sig ligeledes med 5 Kanaler, som blive alt 

 smalere og smalere jo hengere de naa ned i Stilken, indtil 

 de, omtrent 1 — l 1 2 Centimeter fra Basalerne, gaa over i 

 Centralkarret. Hele Kammerorganet med dets Skillevægge 

 er beklædt med Epithel. der bestaar af temmelig lave 

 Cylinderceller, men hvorvidt disse vare forsynede med Ci- 

 lier, kunde ikke iagttages. Det kamrede Organ er opad 

 ganske alsluttet; thi det har ikke været muligt at opdage 

 nogen Aabning, som kunde sætte det i direkte Forbindelse 

 med det af Professor Perrier paaviste Irrigationsapparat, 



to direct attention to a few peculiarities in Bathycrinus 

 carpenteri. 



The stalk is covered exteriorly with an extremelv 

 thin, hyaline, structureless cuticulum, inside of which there 

 js a layer of epithelium formed of pretty regular cubical 

 cells containing a granular plasmatic substance and an 

 almost centrally situated round nucleus with its corpuscle. 

 Inside of the epithelium. and clad by it. the real caleareous 

 skeleton is found, which is composed of the previouslv 

 mentioned joints, formed of strong conneetive-tissue reticul- 

 ation in whose meshes the lime is deposited (Pl. III, fig. 

 '•• a). Strong elastic fibres which bind the joints together 

 (Pl. III, fig. 9 b), are found between the joints, but at 

 same time contribute to make the stalk pretty flexible. 

 When the reticulated conneetive-tissue approaches the 

 central portion of the stalk, it acquires a denser and finner 

 form, which causes a pretty finn membrane to be produced 

 (Pl. III, figs. 9 c, Mia), that clothes the entire central axis 

 and inay be considered a sheath for the vessel lying inside. 

 This consists of a thin membrane whose inner wall is clad 

 with an epithelium formed of pretty small, almost round 

 cells with their nuclei and corpuscles (Pl. III, figs. 9 d. 

 10 b; Pl. IV, fig. 1 a), and upon whose outer wall, between 

 it and the sheath. nerve-fibrils and scattered ganglial cells 

 are found (Pl. III, fig. 9 e, 10 c). In the channel of the 

 vessel a fluid eirculates, which contains clear round bodies 

 with a granular substance (Pl. III, fig. 9 f, 10 d) and 

 which after the animaFs death colleets into larger or sinal- 

 ler clumps (Pl. IV, fig. 1 b). The nervous ramification 

 stretches itself along the vessel, and clothes it until about 

 the niiddle of the lowest fourth part of the stalk, after 

 which it becomes more spread and extremelv difficult to 

 observe; in the roots it entirely disappears, and just as 

 little can any vessel be observed in these. whilst, however, 

 the small, round clear bodies with granular substance are 

 found there, but more sparingly than in the central vessel. 

 That passes now without change, up towards the lower pro- 

 longations of the five-chambered organ, with which it uriites. 



The five-chambered organ is situated in the lowest 

 half part of the calyx, and is formed by a firm conneetive- 

 tissue membrane whose exterior wall is secured to the wall 

 of the calyx by connective tissue filaments, and from whose 

 inner wall 5 divisional walls issue in flabelliform towards 

 the centre (Pl. IV, fig. 2 a) and unite themselves inwards, 

 thereby forming the central canal (Pl. IV. fig. 2 b) in 

 which the so-called dorsal organ is found. At the top the 

 chambered organ prolongs itself into 5 narrow, sausage- 

 shaped cæca, which follow the dorsal organ up towards the' 

 2nd radial; and it likewise prolongs itself downwards with 

 5 canals which become narrower and narrower the farther 

 they reach down the stalk. until they. at about 1 — l 1 '., 

 centimetres from tin 1 basals, pass over into the central 

 vessel. The entire chambered organ with its divisional 

 walls is clad with epithelium which consists of pretty lcw 

 cylinder-cells, but whether these were furnished with cilia 

 could not lie observed. The chambered organ is quite 

 closed at the top, as it lias not been possible to discover 



