14 



Naar Bathycrinus Carpenteri udvikler sig paa almin- 



delig Vis. finder man aldrig en meget lang, fuldt udvoxet 

 Stilk, bærende en yderst liden Krone. Saavidt jeg tør 

 drage en Slutning fra de Individer af forskjellig Størrelse, 

 der fangedes paa Expeditionen, udvikler Stilk og Krone 

 sig proportionalt. saaledes nemlig, at hverken den ene eller 

 anden overskrider det indbyrdes Forhold, hvori de ifølge 

 Lovmæssigheden ere bundne til hinanden. Paa et Individ, 

 der var 49""" hoit, var Stilken 30*""'. Kronen 9""" hoi. og 

 Roden 10""" lang, Tab. III. Fig. 7. Stilken havde omtrent 

 32 tydeligt udprægede Led. der havde antagét Formen som 

 hos det fuldvoxne Dyr, Tab. III, Fig. 8 a, og som indtog 

 de nederste 4 / 6 Parter, medens Leddene paa den øverste 

 Femtepart vare yderst utydelige, — og det var etter al 

 Sandsynlighed paa denne Del, at nye Led dannedes, efter- 

 haanden som Stilken voxede. Basalerne vare sammenvoxede, 

 men man kunde dog endnu se fine Længdelinier eller Sømme 

 paa de Steder, hvor Sammenvoxningen havde fundet Sted. 

 Tab. III, Fig. 8 b. Armene vare noget forskjellige i 

 Længde, alt ettersom de vare mere eller mindre udviklede; 

 thi det var synbart, at Udviklingen ikke var skreden lige 

 langt frem paa alle Arme. Nogle havde 14 — 15 Led. 

 andre havde 17 — 20, og det var at mærke, at de yderste 

 Led vare noget kortere, end de længere nede paa Annen, 

 saaledes at Nydannelsen af Led her, ligesom paa Stilken, 

 foregik paa den øverste Del. Paa 1 1te Led udgik fra 

 dets distale Side en Pinnul, som var knapt 1""" lang, og paa 

 de Arme, der havde 16 — 20 Led viste der sig dels 1. dels 

 2 Pinnuler desforuden, imedens de Arme, som kun havde 

 14 — 15 Led endnu ikke havde faaet mere, end denne ene 

 Pinnul paa Ilte Led. Saavel Radial- som Brachialfurerne 

 vare temmelig dybe og forsynede med udviklede Tentakler, 

 ligesom der ved den runde Mund saaes en Begyndelse til 

 Oralpladen. og langs Brachialfurene de for det voxne In- 

 divid særegne Kalkklapper, Tab. III, Fig. 8 c. 



Vil man nu sammenligne det nys beskrevne, unge Dyr, 

 der havde udviklet sig paa sædvanlig Vis af et Æg, med de, 

 hvor en ny Krone efter min Formening er dannet paa en 

 gammel Stilk, saa antager jeg. at der ikke vil kunne reises 

 synderlig Tvivl om, at den sidstnævnte TJdviklingsmaade 

 maa betragtes som en Slags Knopskydning. 



Anatomisk-histologiske Notitser. 



Der er leveret af D'Herrer Professorer W. A. H. 

 Carpenter, Ludvig, Perrier, C. Vogt og Hamann temmelig 

 udtømmende, anatomisk-histologiske Undersøgelser af Crinoi- 

 derne, saa at, hvad jeg kan meddele, kun kan være dels for 

 at konstatere, hvad der tidligere er gjort, dels for at hen- 



the sexual products; now. was that an accidental circum- 

 stanee, or was the crown thrown off because it had become 

 too old to reproduce the genus? 



When Bathycrinus carpenteri developes itself in the 

 usual manner we never tind a very long, fully developed 

 stalk carrying an extremely small crown. So far as I mav 

 draw a eonclusion from the individuals of various size that 

 were secured by the expedition. the stalk and the crown 

 develope themselves proportionally to each other, in such 

 a manner namely. that neither the one nor the other ex- 

 ceeds the mutual relation in which they by natures law 

 are bound to each other. In an individual which was 4'J""" 

 in height, the stalk was 30""" long, tin- crown 9""" in height, 

 and the root lu»'™ in length .(Pl. III, fig. 7). The stalk 

 had about 32 distinctly prominent joints, which had as- 

 sumed the same form as in the full grown animal (Pl. 

 III. fig. 8 a) and occupied the lowest four-fifths portion, 

 whilst the joints on the uppermost fifth portion were ex- 

 tremely indistinct. — and it was on this portion that, in 

 all probability. new joints formed themselves. according as 

 the stalk grew. The basals were concreted, but fine longi- 

 tudinal lines or seams could still be observed in those 

 situations where the concretion had tåken place (Pl. III. 

 fig. 8 b). The arms were somewhat variable in length. 

 according as they were more or less developed, as it was 

 evident that the development had not advanced equålly far 

 on all the arms. A few had 14 — 15 joints, others had 

 1 7 — 20, and it was to be noted that the outermost joints 

 were somewhat shorter than those farther down on the 

 arm. so that the new formation of joints here, like as on 

 the stalk, took place in the uppermost part. On the llth 

 joint there issued from its distal side a pinnule. which was 

 barely 1'""" long; and on the arms, which had 16 — 20 joints, 

 there appeared partlv 1 partlv 2 additional pinnules, whilst 

 the arms that had only 14 — 15 joints had not vet ob- 

 tained more that that single pinnule on the llth joint. 

 Both the radial, as well as the brachial grooves are pretty 

 deep. and are furnished witli developed tentacles, whilst also 

 the commencement of an oral plate is observed at the round 

 mouth. and along the brachial grooves the calcareous valves 

 peculiar to the full grown individual are seen (Pl. III. 

 fig. 8 c). 



If we now compare the young animal just described. 

 which had developed itself in the ordinary way from an 

 ovum, with those in which a new crown has, in my opinion, 

 been formed upon an old stalk. then. I believe, there can 

 not be raised anv material doubt that the last-named mode 

 of development must be regarded as a kind of budding 

 process. 



Anatomo-histological Remarks. 



Pretty exhaustive anatomo-histological investigations 

 of the Crinoids have been published by Messieurs, Profes- 

 sor W. A. H. Carpenter, Ludvig, Perrier, C. Vogt and 

 Hamann, so that what I have to report can only serve to 

 partly confirm what has been done previously, and partlv 



