mentlig med et yderst interessant phylogenetisk Phænomen 
at gjøre, nemlig: at Sostjernen udvikler sig af Cr- 
noiden. 
Vi antage, at en mere indgaaende anatomisk Under- 
søgelse skulde have frembragt endnu flere Fiendommelig- 
heder end de, vi have kunnet angive; men vi have ikke 
villet ødelægge det eneste Exemplar, som findes og have 
derfor maattet opgive at undersøge nærmere Rygappendixet 
og Hudskelettet m. m. 
Slægtskarakter. 
Legemet 5-armet. Rygsiden beklædt med Paxiller. 
Fra Ryggens Centrum reiser sig et langt, cylindrisk Ap- 
pendix, beklædt med Pigge. Ingen Anus. 2 Rækker ko- 
nisk tilspidsede Fødder. 
Efterat denne Afhandling med Tavler i længere Tid 
har ligget færdig til Trykning, udgjørende en Fortsættelse 
af den i Norsk Magazin for Naturvidenskaberne XX VII 
Bind, 3. Hefte, paabegyndte Afhandling ,Fra den norske 
Nordhavsexpedition*, og hvori Jlyaster er opregnet, — ere 
vi blevne bekjendte med en Beretning af Professor Edm. 
Perrier 1 Comptes Rendus No. 26 (26 Decbr. 1882) ,Sur 
une Astérie des grands profondeurs de IAtlantique, pour- 
vue d'un -pédonceule dorsal.“ 
Paa Travailleur-Expeditionen 1 1880 er der funden 
2 Exemplarer af en lille Søstjerne forsynet med en Dor- 
salstilk, hvilken Perrier har kaldet Caulaster pedunculatus. 
Hos det mindste af disse to Exemplarer har han paavist, 
at ved Basis af Rygappendixet (Stilken) er der to Kredse 
af Plader lig dem, der efter Professor Lovéns Undersøgel- 
ser danner Periproctet hos Echiniderne, og hvorved de 
nærme sig Crinoidernes Calyx. Hos det noget ældre Ex- 
emplar vare disse Plader forsvundne. Paa vor Jlyaster, 
der er meget større end Perriers største Exemplar, 
saaes heller ikke saadanne Plader; men vi have, som tid- 
ligere anført, ikke kunnet foretage nogen dyberegaaende 
Undersøgelse med Hensyn hertil. Perrier antager, og med 
god Grund, at hans Cwulaster danner et Bindeled imellem 
Crinoiderne og Asteriderne, og vore lagttagelser over Ily- 
aster stadfæste end mere denne Antagelse. Efter saavel 
Perrier's som vore nu gjorte Observationer synes det med 
temmelig Bestemthed at fremgaa, at 1 Echinodermernes Ud- 
viklingsrække ere Crinoiderne de ældste og Asteriderne 
yngre; forøvrigt henvise vi til ovennævnte, yderst interes- 
sante Meddelelse 1 Comptes Rendus. 
POS 
ably, concerned with an extremely interesting phylogenetic 
phenomenon viz. that the starfish is evolved from the 
Orinoidea. 
We believe that a more minute anatomical examina- 
tion, would, probably show, still other peculiarities, besides 
those, which we have been able to state here, but we 
have been unwilling to destroy the only existing specimen, 
and have been obliged, therefore, to relinquish a more min- 
ute examination of the dorsal appendix, and the dermal 
skeleton &e. &e. 
Generic character. 
The body 5-rayed. The abactinal surface clad with 
paxillæ. In the centre of the disk, there projects a long 
cylindric appendix clad with spines. No anus. 2 series 
of conical acuminate suckers. 
Since the preparation of this Memoir (it has lain a 
considerable time ready for the press) which forms a con- 
tinuation of the paper , Fra den norske Nordhavs Expedi- 
tion“, published in Norsk Magazin for Naturvidenskaberne 
XXVII Bind, 3die Hefte, and in which Ilyaster is in- 
cluded; we have become acquainted with a Report by Pro- 
fessor Edy. Perrier in Comptes Rendu No. 26 (26 Decbr. 
1882) ,Sur une Astérze des grands profondeurs de lAt- 
lantique pourvue d’un pédoncule dorsal.“ 
During the Travailleur-Expedition in 1880, two spec- 
imens of a small starfish were found, which were furnished 
with a dorsal peduncle, and which Perrier has called Cazl- 
aster pedunculatus. He has shown, that at the base of the 
dorsal appendix (the peduncle) in the smallest of these 
two specimens, there are two rings of plates, like those, 
which according to Professor Lovéns observations form 
the periproct in Echinodermata and in this feature, they 
approach to the chalice in Crinoidea. In the somewhat 
larger specimen these plates had disappeared. Neither, in 
our Jlyaster, which is so much larger than Perrier’s larg- 
est specimen, were any such plates to be seen, but, as al- 
ready stated, we have not been able to institute a minute 
examination in regard tothem. Perrier supposes, and with 
good reason, that his Caulaster forms a connecting link 
between Crinoidea and Asteroidea, and our observations on 
Ilyaster still further confirm this supposition. From both 
Perrier’s and our later observations, it appears, with a con- 
siderable degree of certamty, that m the Hchinodermata’s 
stages of development, the Cyznozdea represents the oldest, 
and the Asteroidea represents the youngest stages in the 
process; but we refer the reader to the above named, ex- 
tremely interesting communication in Comptes Rendus. 
