Asterias spitsbergensis, ». sp. 
Tb, 16 
Denne Søstjerne har ved første Øiekast megen Lighed 
med Stichaster roseus; men ved nærmere Undersøgelse viser 
den sig at være helt forskjellig. 
Asterias spitsbergensis har 5 Arme, og Forholdet 
imellem den lille og store Radius er som 1:41/;; Ryggen er 
hvælvet, Bugen flad, Fig. 1. 3. 
Armene ere temmelig tykke, lidt indknebne ved Grun- 
den, noget afstumpede i Spidsen, stærkt hvælvede paa Ryggen 
og Siderne, hvor de ere besatte med Pigge, der paa Siderne 
danne regelmæssige Længderækker, paa Ryggen uregelmæs- 
sige Tverrækker, Fig. 2. Imellem Piggene saavel paa Skiven 
som Armene er Huden nøgen og indtages af Tentakel- 
porer, Fig. 2. 
Skiven er hvælvet, besat med større og mindre Pigge, 
Fig. 2, der paa Midten gruppere sig ringformig omkring 
den centrale Analaabning. Madreporpladen er noget aflang, 
meget liden og findes strax ovenfor Armvinkelen, nedsænket 
i Huden. 
Ambulacralfuren er begrændset af 3 Rader stærke 
Pigge, Fig. 3, a, af hvilke den ene vender ind imod Furen, 
og her er enhver Pig ved sin Grunddels indre Side omgivet 
af Pedicellarier, den anden vender udad, og den tredie, 
midterste Rad har færre Pigge, fordi Adambulaeralpladerne 
have afvexlende 2 og 3 Pigge. 
Udenfor den ydre Rad af Furepapiller sees en Række 
Pigge, der ere næsten ligesaa store som Furepiggene. De 
staa som oftest to og to sammen efter Længden, og enhver 
af dem er ved deres Grunddels ydre Side omgivet af Pedi- 
cellarier, Fig. 3, b. Endelig sees udenfor denne Rekke, 
nærmere Rygsiden, en dobbelt Række smaa Pigge, der ere 
omkrandsede af Pedicellarier, Fig. 3, c. 
Paa Skiven findes ingen Pedicellarier, derimod ere 
Armene overalt besatte med forskjelligt formede Pedicel- 
larier. 
Pedicellarierne langs Ambulacralfuren sidde paa en 
kort Stilk i smaa Grupper paa den indre Flade af Piggens 
Grunddel. De ere lige (Pédicellaires droits), have en Basis, 
hvis underste Del er rund, hvis øverste Del paa Midten 
er forsynet med en Fremstaaenhed og paa Siderne afgiver 
Asterias spitsbergensis, n. sp. 
JE 16, 
At first sight, this starfish appears to have much 
resemblance to Stichaster roseus; on closer examination, 
however, it is seen to be very different. 
Asterias spitsbergensis has 5 rays, and the proportion 
between the disk-radius and the brachial-radius is, as 1:41/3. 
The dorsal region is rotund whilst the actinal surface is 
flat, (figs. 1, 3). 
The rays are rather thick, slightly constricted at their 
origin, and the points are somewhat rounded. On the dorsal 
and lateral surfaces, they are sharply rounded,, and those 
surfaces are occupied by spines, which, on the lateral sur- 
faces, are distributed in regular longitudinal series, whilst, 
on the dorsal surface, the rows are found transverse and 
placed irregularly. Between the spines of both the disk 
and the rays, the integument is bare, and the seat of tent- 
acular pores, (fig. 2). 
The disk is convex, and occupied by longer or shorter 
spines, (fig. 2), which, in its mesial part, are grouped annul- 
larly around the median anal opening. The madreporite is 
very small, somewhat oblong, and embedded in the integu- 
ment immediately above the interbrachial angle. 
The ambulacral furrow is bordered by 3 series of strong 
spines, (fig. 3 a), of which, one series radiates inwards towards 
the furrow, and in this situation, each spine is surrounded 
on the inner side of its base with pedicellariæ. Another series 
of spines radiates outwards, and the third, or mesial series, 
has a smaller number of spines, owing to the adambulacral 
plates having 2 and 3 spines, alternately. 
Beyond the external series of furrow-papille, there is 
visible a series of spies, which are nearly as long as the 
furrow-spines.” These are most frequently disposed longitud- 
inally, in double pairs, and each spine is environed with 
pedicellariæ on the external side of its base (fig. 3,0). Fin- 
ally, outside of this series of spines, nearer the abactinal 
surface, a double series of spinelets is seen, surrounded by 
pedicellariæ (tig. 3, ¢). 
No pedicellariz are found upon the disk, but, on the 
other hand, the rays are everywhere occupied with pedicel- 
lariæ of different forms. 
The pedicellariz found along the ambulacral furrow, 
occur in small groups, seated on short peduncles, situated 
on the inner surface of the base of the spme. They are recti- 
form, (Pédicellaires droits) with the lower part of the base cir- 
cular, whilst in the middle of their upper ‘part, a protub- 
