195, 200, 237, 260, 261, 262, 275, 286, 290, 
295, 315, 323, 326, 336, 343, 359, 362, 363. 
Dens Udbredning forresten er ganske betydelig, saa- 
ledes: 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). 
Pedicellaster typicus, M. Sars. 
1861. Pedicellaster typicus, M. Sars. Oversigt over Nor- 
ges Echinodermer 1861, pag. 77, Tab. 9, fig. 9— 
17% MEAD, 10, me, =I), 
1877. Asteracanthion paleocrystallus, 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. IT, 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 typi- 
ske 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 fun- 
det, 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 Ski- 
ven 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—6”” 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 smal- 
nede de successivt af mod den spidse Ende. Hudskelettet 
var fuldkommen overensstemmende med den typiske Form, 
og lagttog vi paa Armenes Sider 2 Tentakelporer i hver - 
Maske, hvilket hverken Sars eller Sladen har bemærket. 
Rygpiggene, der ere formede af gjennemborede Plader, ere 
extremity. 
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 Feroe Islands. Iceland. Green- 
land. 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 Nor- 
ges Echinodermer 1861, pag. 77, Tab. 9, fig. 9— 
17. Tab. 10, fig. 1—10. 
1877. Asteracanthion paleocrystallus, 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, 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 mat- 
erial than either Sars or Sladen have had at their dis- 
posal in making their researches. 
In order to be certain in our diagnosis of Sars’ typ- 
ical form, we have had, from Christiania University’s Col- 
lection, 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; some- 
times, 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 spec- 
imens, 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 speci- 
mens, the rays tapered off gradually towards the distal 
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: 
