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80
der indtager Rygfladen. Paxillerne, som bære den ydre
Ryghud, ere ved dels udelte, dels flerdelte Basaler fæstede
til Kalkskelettet. Bugfladens Interbrachialrum udfyldte af
en gjennemsigtig Membran, støttet af lange Kalknaale.
Paa hver Side af Armene en Række semilunære Vetral
aabninger forsynede med Klapper. Ingen Hudgjeller.
Artskarakter.
Hymenaster pellucidus, W. Thomson. Skivens
Rygside hvælver sig imod Centrum. Bugsiden flad.
Forholdet imellem den lille og store Rädius som 1 : 2. Huden
gjennemsigtig. 5 store Paxiller om Traktaabningen, hver
bærende 6—8 korte og 8—10 lange Kalknaale; de øvrige
Paxiller have 4 lange og 3 korte Naale. Hver
Adambu-lacralplade har 3 Pigge, 2 indad mod Bugfuren, 1 udad
mod de semilunære Ventralaabninger. Madreporpladen
rund. Farven rosenrød, spillende i det Violette.
Vi have foretaget endel Maalinger, hvoraf det
fremgaar, at Forholdet imellem den lille og store Radius er
lidt forskjellig efter Søstjernens Størrelse.
Forholdet imellem den lille og store Radius:
1 Exemplar af 12""" Diameter 1:1 l/s.
1 — „ 16""" — 1 :11/2.
1 — „ 18-" — 1 : l4/5.
1 — ,, 24""" — 1 : l»/7.
1 — „ 36""" — 1 : l4/5.
1 — „ 42""" — 1 : ls/4.
2 — „ 50mm — 1:2.
1 — „ 80""" — 1 : 1 >/*.
Findested.
Station 35, et Par Exemplarer. 40, 2 Exempl. 53,
12—15 Expl. 124, nogle Expl. 205, et stort Expl. 223,
et Par smaa Expl. 224, et stort Expl. 295, et Par Expl.
303, et Expl. 353, 3 Expl. 363, det største Expl.
Udbredning.
Slægten synes at have en overordentlig vid
Udbredning ifølge de foreløbige Meddelelser om
Challenger-Expe-ditionen.
of the large body cavity or chamber which occupies the
dorsal surface. The paxillæ which expand the exterior
dorsal integument, are secured to the calcareous skeleton,
by their, partly compact, and partly, divided basal parts.
The interbrachial space of the actinal surface is covered
by a translucent membrane, supported by long calcareous
needles. On each lateral margin of the rays, there is a
series of semilunar apertures, furnished with flaps. There
are no integumental gills.
Specific character.
jHymenaster pellucidus, W. Thomson. The abactinal
disk arches towards the centre. The actinal surface is
flat. The proportion between the disk radius and the
brachial radius is, as 1:2. The integument is translucent.
There are five large paxillæ round the funnel-shaped
aperture, each carrying 6—8 short, and 8—10 long,
calcareous needles, the remaining paxillæ have 4 long, and 3
short needles. Each adambulacral plate has 3 spines, 2 of
them facing inwards, towards the ventral furrow, and the other
one facing towards the semilunar ventral apertures. The
madreporite is circular. The colour is rosy red, tending
to violet.
We have instituted a number of measurements, from
which, it appears that the proportion between the disk
radius and the brachial radius is a little different,
according to the size of the starfish.
Proportion between the disk-radius and the brachial
radius.
1 specimen of 12""" diameter 1 : ll/2.
1 do. „ 16""" — 1 :1
1 do. ,, 18""" — 1: l4/6.
1 do. „ 24""" — 1 : l5/7.
1 do. „ 36""" — 1 : l4/6.
1 do. „ 42""" — 1 : l3/4.
2 do. „ 50mm — 1:2.
1 do. „ 80""" — 1 : 1 V,.
Habitat.
Station No. 35. A couple of specimens.
— „ 40. Two specimens.
— „ 53. 12—15 specimens.
— ,, 124. A few specimens.
— „ 205. A large specimen.
— „ 223. A couple of small specimens.
— ,, 224. A large specimen.
— „ 295. A couple of specimens.
— „ 303. One specimen.
— ,, 353. Three specimens.
— „ 363. The largest specimen.
Distribution.
This genus appears to have an extremely wide range
of distribution, judging by the preliminary report of the
Challenger-Expedition.
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