De store Kalklegemer paa den øvrige Del af Krop- 
pen variere adskilligt i Form; væsentlig bestaa dog Af- 
vigelserne deri, at Pladen har flere Huller, idet nem- 
lig 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 Fpithelet. Det er ‘disse frie Ender af Kronerne, der 
rage op over Hudens Niyeau og give den sin ru Overflade. 
Sammenlignes nu vore Afbildninger af disse Kalk- 
legemer 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 bar gjort, og der- 
nest, 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 Originalexemplarer, 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 Fayne. 
Trochostoma (Haplodactyla) arcticum, Marenzeller.! 
Tab. IX, Fig, 13. 
Af denne Holothuride blev der paa Nordhavs-Expedi- 
tionen fundet en Del Exemplarer, hvorved vi fik Anledning 
til at observere og afbilde den levende. 
have i det Væsentlige konstateret den af Marenzeller givne 
Beskrivelse, kun skulle vi tilføie følgende: 
Det største Exemplar var indtil 190” langt, 30” 
* Dr. E. Marenzeller. Die Coelenteraten, Echinodermen und 
Wirmer der k. k. österreichisch-ungarisehen Nordpol-Expedition. 
Denkschriften der k. k. Academie der Wissenschaften, Wien’ 1878, 
35 Bd. Pag. 357. 
Den norske Nordhaysexpedition. 
Vore Undersøgelser | 
Danielssen og Koren: Holothurider. 
mining the species, 
The large calcareous corpuscles on the remaining por- 
tion 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 origi- 
nal arms dividing each into several branches which after- 
wards 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 ex- 
tremities, both more or less indented, but 
veloped in the epithelium. 
invariably en- 
It is these free extremities of the 
corolle that protend above the plane of the integument, 
giving to the latter a rough surface. 
Now, on comparing our representations of these cor- 
puscles 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 corolla, 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 in deter- 
seeing that, according to Sars’s diag- 
nosis, the calcareous plates in this animal are’ without 
corollæ. 
We have classed Dr. Studer's Molpadia violacea as a 
synony m of Trochostoma boreale, since his brief description 
does not include any distinctive feature that might be re- 
garded as disproving the identity of the two species. Stu- 
der's violacea has been met with in large numbers off Ker- 
guelen, at a depth of 100 fathoms. 
Trochostoma (Haplodactyla) arcticum, Marenzeller.! 
Dl, IDG, fag, =m, 
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 fea- 
tures to confirm the accuracy of Dr. Marenzeller’s descrip- 
tion, to which however the following supplementary parti- 
culars may be added, 
The largest specimen, total length 190”, thickness in 
Marenzeller. Die Coelenteraten, Echinodermen .und 
ky We Nordpol-Expedition. 
Denkschriften der k. k. Academie der Wissenschaften, Wien 1878, 
B. 35, p. 357. 
* IDye, 13 
Wiirmer der osterreichisch-ungarischen 
