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ganske udfyldte af Kalkklumper; igjennem de aabne
Masker passere et eller flere Tentakelrør.
De Plader, der kunne betragtes som dorsale
Randplader, ere 26 i Antal, have en irregulær, næsten trekantet
Form og ere paa deres stærkt hvælvede, ydre Flade
forsynede med en rund Fordybning, der udgjør Leddefladen
for den Pig, den bærer.
De Kalkplader, der kunne betragtes som ventrale
Randplader, og som bære den lange Pig, der hjælper til at danne
Pigrækken strax udenfor Furepapillerne, ere 32 i Antal,
have en krumbøiet Form og fæste sig ved et stærkt
Liga-ment umiddelbart til Adambulacralpladernes underste Rand,
lige udenfor Furepapillernes Befæstningspunkter. Paa den
øverste, brede Flade af Randpladerne, hvilken vender mod
Kropshulheden, fæster sig et lille, næsten gaffelformigt
Kalk-stykke, der med sine Apophyses fæster sig til den ydre
Rand af 2 Adambulacralplader, Tab. III, Fig. 9, b, c.
De ventrale Randplader staa langt fra hverandre, saa at i
Regelen 4 Adambulacralplader optage det Rum, som er
imellem 2 Randplader. Imellem de dorsale og ventrale
Randplader er et smalt, langstrakt Kalkstykke.
Odontophoren bestaar af to Kalkstykker, der ere
forenede ved et Ligament, Tab. III, Fig. 9, d. Saavel paa
Adoral- som Aboralsiden er et dybt Indsnit. Paa dens
indre Side er paa Midten en liden Fremstaaenhed.
Adambulacralpladerne ere halvrunde, skiveformige. Den
adorale Flade har en stærk Kam paa Midten, den aborale
er jævn konkav; den øverste Raad er tvers afskaaren, den
underste og ydre Rand er konvex. Hver
Adambulacral-plade bærer to stærke Pigge, hvoraf den yderst staaende
er længst.
Ambulacralaabningerne ere noget uregelmæssigt
stillede nærmest Skiven, Tab. III, Fig. 9.
Farven høirød paa Ryggen, hvidgul paa Bugen.
Pindested.
Station 374. Advent-Bay, Spitsbergen; kun nogle
Exemplarer.
Artskarakter.
Forholdet imellem den lille og store Radius som 1 :
öVa- Skiven bred med. faa enkeltstaaende Pigge; 5 tykke
Arme, paa hvis Ryg 5 Rækker stærke Pigge, der ere
krandsformig omgivne af korsdannede Pedicellarier.
Temmelig spredte, ligedannede Pedicellarier indtage hele
Ryggen. ’Paa Siden af Armene en Række stærke Pigge, 26 i
Antal, omgivne af korsdannede Pedicellarier. To Rækker
Ambulacralpapiller, hvoraf de i den yderste Række ere
længst. Udenfor Ambulacralpapillerne en Række stærke,
lange Pigge, 32 i Antal, halvomsluttede af korsformige
Pedicellarier. Hudskelettet stærkt bygget. Farven paa
Ryggen høirød. Pedicellarierne, der omgive Piggene, danne
hvide Duske. Bugen bleg, hvidgul.
Den norske Nordhavsexpedition. Daiiielssen og Koren: Asteroidea. 233
ones are nearly closed up with calcareous deposit: one, or
more, tentacular tubes pass through the open meshes.
The plates which may be considered to be
dorso-marginal plates, are 26 in number, and have an irregular
nearly tri-lateral form; upon the sharply arched exterior
surface, they are furnished with a circular cavity, which
forms the articulatory surface for the spine which it carries.
The calcareous plates which may be considered to
be ventro-marginal plates, and which carry the lorçg spines
that assist in forming the spinous series immediately
outside the furrow-papillæ, are 32 in number. They have a;
curved form, and, are attached by a strong ligament, close
to the inferior margin of the adambulacral plates, just
outside the points of attachment of the furrow-papillæ. On
the superior broad surfaces of the marginal plates, facing
towards the body cavity, a small nearly bi-furcate calcareous
ossicle is attached, which adheres by its apophyses to the
exterior margin of 2 adambulacral plates, (Pl. Ill, fig. 9,
b, c). The ventro-marginal plates are placed at a
considerable interval from each other, so that, as a rule, 4
adambulacral plates occupy the space between 2 marginal plates.
Between the abactinal and actinal marginal plates, there
occurs an elongate, narrow, calcareous ossicle.
The odontophore consists of two calcareous ossicles
united by a ligament, (Pl. Ill, fig. 9, d). On both,- the
adoral and aboral surfaces, there is a deep incision. On
the inner surface, a small mesial protuberance occurs.
The adambulacral plates are semicircular and discoidal
in shape. The adoral surface has a strong mesial ridge;
the aboral surface is uniformly concave; the suporior margin
is truncated; the inferior, (exterior) margin is convex. Each
adambulacral plate carries two strong spines, of which the
external one is the longest.
The ambulacral openings are somewhat irregularly
placed, contiguous to the disk (Pl. Ill, fig. 9).
The colour of the abactinal surface is deep-red, and
of the actinal surface, whity-yellow.
Habitat.
Advent Bay, Spitzbergen. Station 374. A few
specimens only.
Specific Character.
The proportion between the disk-radius and the brachial
radius is as 1:51/8. The disk is broad, and occupied by a
few solitary spines: 5 thick rays carrying 5 dorsal rows of
strong spines, environed by wreaths of cruciform
pedi-cellariæ. Rectiform pedicellariæ somewhat dispersed, occupy
the whole abactinal surface. The rays carry laterally, a
series of strong spines, 26 in number, which are environed
by cruciform pedicellariæ. Two series of ambulacral papillæ,
of which, those in the exterior series are the longest.
Outside the ambulacral papillæ, a series of long, strong spines,
32 in number, semi-enclosed by cruciform pedicellariæ. The
dermal skeleton strongly constructed. The abactinal colour,
deep-red. The pedicellariæ which environ the spines form
white tufts. The actinal colour, pale whity-yellow.
2
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