Paa Bugfladen er en Række aflange, temmelig |tykke 
Plader, hvis indvendige Rande støde umiddelbart til Adam- 
bulaeralpladerne, og hvis undre Flade er temmelig konvex 
og danner en ophøiet Leddeflade for de to spatelformede 
Pigge. Disse Plader kunne betragtes som ventrale Rand- 
plader, der med deres ydre Rande forene sig med en Række 
Plader, der danne Overgangen til Side- og Rygpladerne, 
og som kunne betragtes som dorsale Randplader, der lige- 
som de øvrige Rygplader ere besatte med Pigge. 
Skelettet frembyder intet særegent. 
Adambulaeralpladerne ere temmelig flade, og paa de- 
res undre, afrundede Rand bære de to temmelig lange, di- 
vergerende Pigge. 
Artskarakter. 
Femarmet, liden Sostjerne med konvex Ryg og flad 
Bug. Den lille Radius forholder sig til den store som 1:5. 
Ryggen overalt besat med kølleformede, i Grupper staa- 
ende Pigge, hvilke paa Armene danne regelmæssige Længde- 
rækker; imellem disse, Tentakelporer stillede 1 Længde- 
rækker.  Ventrale Randpigge spatelformede, parvis sam- 
menstillede. Analaabningen subcentral. Madreporpladen 
flad, næsten skjult af Pigge. Farven bleg gulrød. Fad- 
derne mørkere gule. 
Findested. 
Station 173. Et Exemplar. 
Den nu beskrevne Søstjerne har adskilligt tilfeelles med 
Stichaster roseus, saa at vi ved en overfladisk Betragtning 
antog den for muligens at være en Unge af samme; men 
ved nøiere Undersøgelse viste det sig, at den væsentlig ad- 
skiller sig fra den. Skiven er bredere, Armene ikke saa 
runde, med en liden Længdekjøl paa Midten. Bugfladen 
mere udpræget, og en Række lange, flade, spatelformede, 
ventrale Randpigge adskille skarpt Ryg fra Bug; de at- 
lange, ventrale Randplader støde umiddelbart til Adambu- 
lacralpladerne, og Rygpladerne bære færre Pigge. Paa 
Stichaster roseus findes ingen saadan Række Randpigge; 
paa Bugfladen har den vistnok en Række Pigge, der staa 
3 og 3 sammen, men de danne ingen fremspringende Rand. 
Disse Pigge ere fæstede til en Række temmelig tykke, af- 
lange Kalkplader, der svare til de hos Stichaster arcticus 
beskrevne, og som vi betragte som Randplader; men de 
støde ikke umiddelbart til Adambulacralpladerne, — der er 
nemlig imellem disse og hine en Række spinkle, aflange 
Kalkplader, der bære en Pig, saaledes at hos Stichaster 
roseus er der en Række Pigge imellem Ambulacralpapil- 
On the actinal surface, there occurs, a series of oblong 
rather thick plates, whose interior margins abut close upon 
the adambulacral plates, and whose inferior surface ‘is 
rather convex, and forms an elevated articulatory surface for 
the two spatulate formed spies. These oblong thick’ plat- 
es, may be considered, to be ventro-marginal plates which 
unite by their exterior margins to another series of plates, 
forming thus, a transition to the lateral and dorsal plates, 
and these transition plates, may be considered to be dorso- 
marginal plates. These, as well as, the other dorsal plates, 
are beset with spines. 
The skeleton presents nothing noteworthy. 
The adambulaeral plates are rather flat, and upon 
their inferior rounded margin, they carry two rather long 
divergent spines. 
Specific character. 
A small, 5-rayed starfish, with convex abactinal sur- 
face, and flat actinal surface. The disk radius, bears to 
the brachial radius the proportion of, as 1:5. The abac- 
tinal surface is everywhere beset with club-shaped spines 
placed in groups, which, on the rays, form regular longitud- 
inal series. Between these spines, longitudinal series of 
tentacular pores appear. The ventro-marginal spines are 
spatulate in form, and placed together in pairs. The anal 
aperture is submesial. The madreporite is flat, and nearly 
concealed by spines. The colour is pale yellowish red, 
with the suckers a darker yellow. 
Habitat. 
Station 173. One specimen. 
The starfish which has now been described, has so 
much in common with Stichaster roseus, that, upon a su- 
perficial examination we supposed, that it was, possibly, a 
young specimen of that species, but, upon closer examina- 
tion, it became evident, that it differed essentially from 
Stichaster roseus. The disk is broader, and the rays are not, 
so much rounded, besides that is has a small longitudinal 
mesial ridge. The ventral surface is more distinctly defined, 
and a series of long, flat spatulate, ventro-marginal spines, 
sharply defines, the line between the abactinal and actinal 
surfaces. The oblong ventro-marginal plates abut close 
upon the adambulacral plates, and the dorsal plates carry 
4 spines. In Stichaster roseus, no such series of marginal 
spines is found; on the ventral surface, it has, it is true, 
a series of spines, placed 3 and 3 together, but these, form 
no prominent margin. These spines are secured, to a ser- 
ies of rather thick, oblong, calcareous plates, which corre- 
spond with these, described as pertaining to Stichester arc- 
ticus, and which we consider to be marginal plates, but, 
they do not abut close upon the adambulacral plates, for, 
