dende paa Bathycrinus-Stilken sit hele Liv igjennem, naar 

 forst Fodskiven har tilstrækkelig omklamret Stilken. 



Et Par Exemplarer løsnede sig fra denne og havdes 

 levende i omtrent 8 Dage; men omendskjønt Dyrene toge 

 Næring til sig og bevægede sine Tentakler livligt, bleve de 

 dog forresten liggende ganske uforandrede paa Bunden af 

 Observationskarret. Den omboiede Fodskive udvidede sig 

 ikke. kun den føromtalte, hornede Masse syntes at losne 

 sig lidt, idet en seig Vædske udsivede fra Fodskiven. 



Med ganske unge Dyr forholder det sig noget ander- 

 ledes; hos dem har Fodskiven kun i ringe Grad — ja hos 

 meget unge endog slet ikke — omklamret Stilken, men er 

 fæstet til denne kun ved en seig, slimet Masse, saa at de 

 muligens kunne forandre Plads. Tab. VII. Fig. 1 «. 



Kroppen (Kolumnen) er paa unge Exemplarer ruml 

 og ikke synderlig videre end den runde Fodskive. Tal). VII, 

 Fig. 1 a, men anderledes forholder det sig med de voxne 

 Dyr; hos dem er den nederste Del af Kroppen elliptisk 

 udvidet i samme Retning som Fodskiven. og dens udven- 

 dige Va?g er her glat. Tab. VII. Fig. 2. B, imedens den 

 øvrige Del er mindre aflang og stærkt ribbet etter Læng- 

 den. 



Ribberne ere 24 og mest fremspringende paa Kolum- 

 nens øverste Rand, der faar Udseende af en foldet Krave. 

 Tab. I, Fig. 4, Tab. VII, Fig. 1, 2. men aftage efter- 

 haa nden nedad baade i Tykkelse og Bredde, Tab. VII, 

 Fig. 2. Paa disse Ribber iagttages 3—4 smaa, runde 

 Papiller, der staa i en Længderække og have paa deres fri, 

 afrundede Ende en fin, rund Aabning, Tab. VII. Fig. 2. 



Kolumnen er henved 10""" hoi; dens ovre Rand er 

 10'"'" efter Længden, 7""" efter Bredden; dens nederste Del, 

 hvor den gaar over i Fodskiven, er 22 — 24""" efter Læng- 

 den og kun 5""" i Bredden. Kropsva'ggen er meget fast. 

 og naar Tentaklerne ere indtrukne, næsten bruskagtig 

 saavel at fole paa som at gjennemskjære. 



Mundskiven, der er næsten rund. er hvælvet og for- 

 synet med fine Folder, som udgaa straaleformigt fra M an- 

 den til Tentakelranden. Paa disse Folder (Ribber) sees 

 hist og her enkelte smaa, runde Papiller, fuldkommen lig 

 dem paa Kroppen, der ovenfor ere omtalte, Tab. VII, Fig. 2. 

 Mundaabningen er aflang med stærkt foldede Læber; dens 

 Lamgdeaxe krydser Kroppens Længdeaxe, og de to Svælg- 

 gruber, der ere temmelig brede, lindes som sædvanlig hos 

 Actinierne i Mundvinklerne, og ikke som hos Stephanactis 

 paa Mundens bredere Del (Læberne). Mundaabningen og 

 den øverste Del af Svælget synes ikke at have fulgt med 

 den elliptiske Udvidning af Fodskiven og Kroppen. 



disc from which it has, undoubtedly. been deposited. The 

 animal can, therefore, scarcely change its situation, hut 

 must. probably. remain seated on the Bathycrinus-stem all 

 through its life, after the pedal disc has once sufficiently 

 clasped the stem. 



I detached a couple of specimens from the stem, and 

 maintained them alive for about eight days ; but although 

 the animals imbibed nutrition and moved tbeir tentacles 

 actively, they vet remained, otherwise, perfectly motionless 

 at the bottom of the glass vessel. The bent pedal disc 

 did not become expanded; only the corneous mass, pre- 

 viously mentioned, seemed to loosen- itself a little. whilst a 

 viscous substance exuded from the pedal disc. 



In perfecthj young animals the relations are some- 

 what different; in them the pedal disc lias only in a slight 

 degree — indeed in very young ones even not at all — 

 embraced the stem. and adberes to it only by a tough slimy 

 mass. so tliat, possibly, they may lic able to change their 

 situation (Pl. VII, fig. 1 a). 



The body i the column i is. in young specimens, 

 round. and not verv niucli wider than the round pedal disc 

 (Pl. VII. tig. 1 a); the case is different however in the 

 adult animals. In them the inferior part of the body is 

 eUipticalbj expanded in the same direction as the pedal 

 disc, and its external wall is. here, smooth (Pl. VII. figs. 

 2. 3), whilst the remainder is less oblong. and strongly 

 ribbed longitudinally. 



The ribs are 24 in number. and are specially protu- 

 berant on the uppermost margin of the column. which ac- 

 quires, thus. the appearance of a frilled collar (Pl. I, fig. 4, 

 Pl. VII. figs. I. 2) hut. lower down. they diminish gradu- 

 ally. lioth in thickness and in breadth (Pl. VII, fig. 2). 

 On these ribs 3 — 4 small round papillæ are observed, 

 situated in a longitudinal series, aud having. on their free 

 rounded extremities. a minute round opening iPl. VII, 

 tig. 2). 



The column is about 10""" in height; its superior 

 margin measures 10""™ longitudinally, and 7 " ' transversally; 

 its inferior portion, where its passes into the pedal disc, 

 measures 22 — 24™'" longitudinally, and only 5""" transvers- 

 ally. The body-wall is very finn. and when the tentacles 

 are retracted it is almost cartilaginous, botb to the touch 

 as well as to the knife. 



The oral disc, which is almost circular, is arcuate, 

 and is furnished witli slender folds issuing radially from 

 the mouth to the tentacular margin. On these folds (ribs) a 

 few small, round, papillæ are here and there seen, exactly 

 like those upon the body previously spoken of (Pl. VII, 

 fig. 2). The oral aperture is oblong, with strongly folded 

 labiæ; its longitudinal axis traverses the longitudinal axis 

 of the body, and the two gonidial grooves, which are rather 

 broad, are found, as usual in the Actinaria, in the oral 

 angles, and not, as in Stephanactis, in the broadest part 

 of the mouth ithe labiæ). The oral aperture and the up- 

 permost part of the æsophagus do not appear to have 

 kept pace with the elliptical expansion of the pedal disc 

 and the body. 



