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100
Pigge og paa Armens Rand en Række Pigge, hvis brede
Ende er forsynet med 5 temmelig lange Spidser.
Parven bleg gul; Fødderne mørkere gule.
Findested.
Station 124, et større og et ganske lidet Exemplar.
Ståt. 164, to mindre Exemplarer.
Udbredning.
Wyvilie Thomson fandt Korethraster hispidus syd for
Færøerne i den kolde Area. Paa den k. k.
østerrigs-ungarske Nordpol-Expedition blev den funden ved 79° 9’ N.
B. 62° 3’ 0. L.
of long, also flattened and hollow spines, and on the
margin of the rays, a series of spines, whose broad
extremities are furnished with five rather long points.
The colour is pale yellow. The suckers a darker
yellow.
Habitat.
Station No. 124. One largo, and one quite small
specimen.
— „ 164. Two smallish specimens.
Distribution.
Wyville Thomson found Korethraster hispidus, south
of the Faroe Islands, in the cold area. During the Imperial
Austro-Hungarian North Polar Expedition it was found in
79° 9’ N. L. 62° 3’ E. L.
Ilyaster mirabilis, n. g. et sp.
Tab. VII, Fig. 15—10.
Legemet femarmet, 30""" fra den ene Armspids til
* den anden. Den lille Radius forholder sig til den store
som 1 : 2s[i. Skivens Diameter 7""". Fig. 15.
Ryggen er flad, overalt besat med Paxiller, der ere
dels runde, dels mere eller mindre aflange, temmelig
fint-kornede og have efter deres Størrelse 3—6 Korn
stundom med et Midtkorn men hyppigst uden saadant, Fig. 16
17. Under Mikroskopet vise disse Korn sig som korte,
knopformige, stærkt takkede Kalklegemer med en Ledflade
paa Basaldelens Ende.
Fra Skivens Centrum reiser sig paa Rygsiden en 8’"’"
høi, kegleformig Forlængelse, der er omtrent 2mm bred ved .
G-runden og smalner af efterhaanden, indtil den ved dens
frie, noget afrundede Ende indtager en Tykkelse af
omtrent 0.5""", Fig. 15, 16. Denne eiendommelige
Forlængelse føles kompakt i sin største Længde, og kun dens
brede Grunddel synes at være hul. Den er overalt
beklædt med Paxiller, som staa langt fra hverandre, ere
stillede i Tverrækker, der ligesom i Spiraler gaa fra Grunden
op til Spidsen, som har et ganske lidet, nøgent Punkt.
Disse Paxiller bære i Regelen 3, sjeldnere 4 temmelig
lange Naale, Fig. 18.
Under Mikroskopet vise disse Naale sig egentlig at være
lidt langstrakte Pigge med en liden Artikulationsflade paa
den noget bredere Basaldel.
Madreporpladen er aflang og sidder lige ved Randen
af en Armvinkel.
Ilyaster mirabilis, n. g. and sp.
PI. VII, ligs. 1.-)—10.
The body is 5-rayed, and the diameter, measured
between the tips of two opposite rays, is 30mm. The disk
radius bears to the brachial radius, the proportion of, as
1 : 2a/j. The diameter of the disk is lmm (fig. 15).
The abactinal surface is flat, and everywhere, beset
with paxillæ, which are, partly, round, partly, more
or less oblong, and rather fine-grained, and according to
size, they are furnished with 3—6 grains, and also,
occasionally, with a central grain, although, most frequently, they
appear without that feature (figs. 16. 17). Under the
microscope, these grains appear, as short knob-formed, strongly
aculeated calcareous corpuscles, having an articulatory
surface on the basal part.
In the centre of the abactinal disk, there rises a
coniform projection, 8""" high and about 2mm broad at the base,
but gradually diminishing in thickness, until at its free
somewhat rounded extremity, it becomes reduced to about
0.5’"m thick (fig. 15. 16). This peculiar appendix is, for the
greater part of its length, compact to the touch, and only
at the basal part, does it appear to be hollow. It is,
everywhere, clad with paxillæ placed wide apart from each
other, in transverse series extending in spiral form, from
the base to the exti’emity, and on the last named, there
occurs, a quite small, bare spot. These paxillæ, usually,
carry three, and more rarely, four rather long needles
(fig. 18).
Under the microscope, these needles appear to be,
really, slightly elongate spines, with a small articulatory
surface situated on the proportionately broader basal part.
The madreporite is oblong, and is seated close to the
margin of a brachial angle.
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