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36
195, 200, 237, 260, 261, 262, 275, 286, 290,
295, 315, 323, 326, 336, 343, 359, 362, 363.
Dens Udbredning forresten er ganske betydelig,
saaledes: Langs hele den norske Kyst. Den engelske Kyst.
Kattegat. Færøerne. Island. Grønland. Spitsbergen.
Novaja Semlja. Nordamerika. Det hvide Hav. Nordky-.
sten af Asien (Brandt). Java (von Martens).
195, 200, 237, 260, 261, 262, 275, 286,
290, 295, 315, 323, 326, 336, 343, 359,
362, 363.
Its distribution, otherwise, is quite extensive, namely:
along the whole of the Norwegian Coast. The British
coasts. The Cattegat. The Færoe Islands. Iceland.
Greenland. Spitzbergen. Nova Zembla. North America. ’The
"White sea. The North coast of Asia (Brandt). Java (von
Martens).
Pedicellaster typicus, M. Sars.
1861. Pedicellaster typicus, M. Sars. Oversigt over
Norges Echinodermer 1861, pag. 77, Tab. 9, fig. 9—
17. Tab. 10, fig. 1—10.
1877. Asteracanthion palæocrystallus, Sladen. Ann.
&Ma-gaz. Nat. Hist. Ser. 4, Vol. XX, pag. 455.
1880. Pedicellaster palæocrystallus, Ann. & Magaz. Nat.
Hist. Ser. 5, Vol. V, pag. 216.
1881. Pedicellaster palæocrystallus, Duncan & Sladen. A
Memoir on the Echinodermata of the Arctic sea to
the West of Greenland, pag. 34, Tab. II, fig. 22—26.
Af denne lille Søstjerne blev fundet paa Expeditionen
endel Exemplarer fra forskjellige Lokaliteter saavel i den
varme som kolde Area, hvorved et noget rigere Material
har staaet til vor Raadighed, end det Sars og Sladen har
havt til sine Undersøgelser.
For at være sikker paa, at vi havde med Sars’s
typiske Form at gjøre, have vi faaet udlaant fra Christiania
Universitets Samlinger det Originalexemplar, der har ligget
til Grund for hans Beskrivelse.
Vi have nu anstillet Sammenligninger, og vi have
fundet, at alle vore Exemplarer paa nogle smaa Afvigelser
nær, som vi senere skulle omtale, stemme ganske overens
med Sars’s Originalexemplar-.
Paa de 12 Exemplarer, vi have undersøgt, havde
Skiven en meget forskjellig Størrelse; Armene vare paa 3
Exemplarer lige lange, paa de øvrige 9 Exemplarer vare
snart 2, snart 3 Arme kortere, end de andre, saa at der
endog kunde være 5—6mm Forskjel paa Længden. Hos
nogle Exemplarer, især de, der vare fra den kolde Area,
vare Armene temmelig brede og fyldige ved deres Grund,
imedens de hos andre vare smalere; men hos Alle
smalnede de successivt af mod den spidse Ende. Hudskelettet
var fuldkommen overensstemmende med den typiske Form,
og iagttog vi paa Armenes Sider 2 Tentakelporer i hver
Maske, hvilket hverken Sars eller Sladen har bemærket.
Rygpiggene, der ere formede af gjennemborede Plader, ere
Pedicellaster typicus, M. Sars.
1861. Pedicellaster typicus, M. Sars. Oversigt over
Norges Echinodermer 1861, pag. 77, Tab. 9, fig. 9—
17. Tab. 10, fig. 1—10.
1877. Asteracanthion palæocrystallus, Sladen. Ann. &
Magaz. Nat. Hist. Ser. 4, Vol. XX, pag. 455.
1880. Pedicellaster palæocrystallus, Ann. & Magaz. Nat.
Hist. Ser. 5, Vol. V, pag. 216.
1881. Pedicellaster palæocrystallus, Duncan & Sladen. A
Memoir on the Echinodermata of the Arctic sea to
the West of Greenland, pag. 34, Tab. H, figs. 22—26.
A number of specimens of this small starfish, were
collected from different localities during the expedition;
both, in the temperate and in the cold area, and, we have
thus, been in posession, of a somewhat more abundant
material than either Sars or Sladen have had at their
disposal in making their researches.
In order to be certain in our diagnosis of Sars’
typical form, we have had, from Christiania University’s
Collection, the loan of the original specimen which formed the
basis for Sars’ description.
We have subsequently instituted comparisons, and have
found; that all our specimens, with the exception of a few
small divergencies which we shall subsequently refer to,
quite coincide with Sars’ original specimen.
In the 12 specimens which we have examined, the disk
had a very varying size. The rays, were in 3 specimens,
uniform in length; but, in the remaining 9 specimens;
sometimes, 2 rays, and, sometimes, 3 rays, were shorter than
the others; so much so, indeed, that [the difference in length,
could amount to as much as 5—6 millimetres. In a few
specimens, and specially in those from the cold area, the rays
were rather broad, and tumid at the origin, whilst, in
others, again, they were narrower, but in all the
specimens, the rays tapered off gradually towards the distal
extremity. The dermal skeleton was exactly similar to
that of the typical form, and upon the lateral surfaces of
the rays, we observed 2 tentacular pores in each mesh:
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