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65
De store Kalklegeraer paa den øvrige Del af
Kroppen variere adskilligt i Form: væsentlig bestaa -dog
Afvigelserne deri, at Pladen har flere Huller, idet
nemlig de oprindelige 3 Arme. dele sig i flere Grene, som
igjen forene sig, — og i at Skaftet (Kronen), som
altid med sin trearmede Grund reiser sig fra Midten af
Pladen, deler sig i to, saa at der bliver to frie Ender, der
hver især er mere eller mindre takket, men altid beklædt
af Epithelet. Det er disse frie Ender af Kronerne, der
rage op over- Hudens Niveau og give den sin ru Overflade.
Sammenlignes nu vore Afbildninger af disse
Kalklegemer med Sars’s, vil man finde en saa stor Forskjel, at
man skulde vanskeligen tro, man havde samme Art for sig,
hvilket dog er Tilfældet. Sagen er nemlig den. at Sars
for det første intet Tversnit af Huden har gjort, og
dernæst, at han ganske har overset Kronerne, idet han har
antaget, at det er Udløberne paa Kalkpladerne, der rage
op over Hudfladen.
Dersom vi ikke havde kunnet overbevise os herom
ved at undersøge Huden af Sars’s Originalexeinplarer, vilde
vi have været i temmelig stor Forlegenhed med Hensyn til
Bestemmelsen af Arten, da denne, efter Sars’s Angivelser,
havde Kalkplader uden Kroner.
Vi have opstillet Dr. Studers Molpadia violacea som
Synonym til Trochostoma boreale; thi vi finde ikke af hans
korte Beskrivelse nogensomhelst Forskjel, ifølge hvilken de
skulde kunne adskilles. Studers violacea er fundet ved
Kerguelen i Mængde paa en Dybde af 100 Favne.
The large calcareous corpuscles on the remaining
portion of the body vary considerably in form; the difference
they exhibit consists however merely in having the plate
pierced with a greater number of holes, — the 3
original arms dividing each into several branches which
afterwards unite, — and in the shaft (corolla), which, with its
trifid base, invariably springs from the centre of the plate,
dividing dichotomously. the result of which is .two free
extremities, both more or less indented, but invariably
enveloped in the epithelium. It is these free extremities of the
corollæ that protend above the plane of the integument,
giving to the latter a rough surface.
Now, on comparing our. representations of these
corpuscles with those of Professor Sars, we find the difference
so great, that it is difficult to conceive the possibility of
their referring to one and the same species: yet such is
the case. The fact is, first, that Sars did not examine a
transverse section of the skin; and secondly, that he altogether
mistook the character of the corollæ. believing them to.be
offshoots from the calcareous plates projecting above the
surface of the skin.
Had we not been able to convince ourselves of this
by examining the skin in Sars’s original specimens.- we
should have found very considerable difficulty 1n
determining the species, seeing that, according to Sars’s
diagnosis, the calcareous plates in this animal are without
corollæ.
We have classed Dr. Studer’s Molpadia violacea as a
synonym of Trochostoma boreale, since his brief description
does not include any distinctive feature that might be
regarded as disproving the identity of the two species.
Studer’s violacea has been met with in large numbers off
Kerguelen. at a depth of 100 fathoms.
Trochostoma (Haplodactyla) arcticum, Marenzeller.1
Tab. IX, Fig. 1—5.
Af denne Holothuride blev der paa
Nordhavs-Expedi-tionen fundet en Del Exemplarer, hvorved vi fik Anledning
til at observere og- afbilde den levende. Vore Undersøgelser
have i det Væsentlige konstateret den af Marenzeller givne
Beskrivelse, kun skulle vi tilføie følgende:
Det største Exemplar var indtil 190"" langt, 30"""
1 Dr. E. Marenzeller. Die C’oelenteraten, Eehinodermen und
Würmer der k. k. üsterreichiseh-ungarischen Nordpol-Expedition.
Denkschriften der k. k. Academie der Wisscnschaften, AVien 1878,
35 Bd. Pag. 357.
Den norske Nordbavsexpedition. Dauielssen ok Koren: Holothurider.
Trochostoma (Haplodactyla) arcticum, Marenzeller.1
Pl. IX, figs, i—r».
A few specimens of this Holothurian were collected
on the North-Atlantic Expedition, which furnished us with
an opportunity of figuring the animal in a living state.
The results of our observations tend in all essential
features to confirm the accuracy of Dr. Marenzeller’s
description, to which however the following supplementary
particulars may be added.
The largest specimen, total length 190"". thickness in
1 Dr. E. Marenzeller. Die Coelenteraten, Eehinodermen und
Würmer der k. k. österreichiseh-ungarischen Xord]>ol-Expedition.
Denkschriften der k. k. Academie der Wissenscha’ften. Wien 1K7K,
B. :(5, p. 357.
fl
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