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43
Hudskelettet dannes paa hele Rygfladen af større og
mindre, taglagte Kalkstykker, der have en noget forskjellig
Fonn. Paa Skiven ere de størst, have i Almindelighed
flere korte Forlængelser, der ved at lægge sig over paa de
tilstødende Kalkstykkers Udløbere bidrage til at danne et
Kalknet med yderst smaa Masker, hvori findes en
Ambu-lacralpore, Tab. IX, Fig. 5, b. Paa Armenes Ryg har
Kalknettet lidt videre Masker, men paa Siderne bliver det
kompaktere, Maskerne mindre og regelmæssigere, og de
enkelte Kalkstykker have her Formen af et X med
særdeles bredt Midtparti, Tab. IX, Fig. 5, c.
Paa Bugfladen bestaar Hudskelettet af Kalkplader
med 3 eller 4 Udløbere, som ere taglagte og indtage hele
Interbrachialrummet, Tab. IX, Fig. 5, d.
De ventrale Randplader ere meget smaa, smale,
langstrakte Kalkstykker, som paa deres ydre Flade bære den
Kam af Paxiller, der ligesom danner Søstjernens Rand,
Tab. IX, Fig. 5, e. 6, a. De dorsale Randplader ere
end mindre, men have samme Form som de ventrale og
bære en Paxille, Tab. IX, Fig. 6, b.
Odontophoren har paa Midten af sin øverste Rand et
temmelig stærkt Fremspring. Dorsalapophysen er liden,
Tab. IX, Fig. 5, /.
Adambulacralpladerne ere temmelig store, fem- eller
sex-kantede med konkav-konvexe Flader og ere forsynede med
Pigge, som tidligere ere omtalte, Tab. IX, Fig. 6, c.
Am-bulacralpladerne afvige ikke synderligt fra Formen, der
tilhører Slægten Solaster.
Farven.
Ryggen mørkerød, Bugen hvid, spillende lidt i det Gule.
Findested.
Station 290. 1 Exemplar.
Artskarakter.
Legemet 7-armet. Forholdet imellem den lille og store
Radius som 1:3. Paxillerne paa Ryggen temmelig epredte,
men danne regelmæssige Rækker paa Armene.
Interbrachi-alrummene besatte med enkelte Pigge, ellers nøgne. Langs
Ambulacralfuren en Række Pigge. Fra enhver
Adambula-cralplade udgaa indad imod Furen 3—5 paalangsstillede
Pigge, udenfor Furen et lignende Antal paatvers stillede.
28 smaa ventrale Randplader, bærende penselformige
Paxiller. Farven: Ryggen mørkerød, Bugen hvid.
The dermal skeleton of the whole of the dorsal surface, is
formed of larger and smaller imbricate calcareous ossicles,
whose form is somewhat varied. They are largest on the disk,
and, usually, have several short projections which laminate with
the projections of the adjoining calcareous ossicles, and thus,
assist in forming a calcareous reticulation having extremely
small meshes, in each of which, an ambulacral pore is visible
(Pl. IX, Fig. 5, b). On the abactinal surface of the rays, the
calcareous reticulation has slightly wider meshes, but, on the
lateral surfaces, the reticulation becomes more compact,
and the meshes are smaller and more regular, whilst, the
individual calcareous ossicles have, here, the form af an X,
with a particularly broad crucial part (Pl. IX, fig. 5, c).
The dermal skeleton of the actinal surface consists of
calcareous plates having 3 or 4 projections, which are
imbricate, and include the entire interbrachial space (Pl. IX,
fig. 5, d).
The ventro-marginal plates are very small, narrow,
elongate, calcareous ossicles, and they carry on their
exterior surface, the ridge of paxillæ, which, as it were,
forms the margin of the starfish (Pl. IX, fig. 5, e. 6, a).
The dorso-marginal plates are still smaller, but have the
same form as the ventro-marginal plates, and carry one
paxilla (Pl. IX, fig. 6, b).
In the middle of its superior margin, the odontophore
has a rather prominent protuberance. The dorsal
apophysis is small (Pl. IX, fig. 5, /).
The adambulacral plates are rather large, and are
pentagonal or hexagonal in shape, with concavo-convex
surfaces, and they are furnished with spines which have
previously been referred to (Pl. IX, fig. 6, c). The
ambulacral plates do not materially differ from the form
pertaining to the genus Solaster.
Colour.
The abactinal surface is dark red. The actinal
surface is white, tending, slightly, towards yellow.
Habitat.
Station No. 290. One specimen.
Specific Character.
The body is 7-rayed. The proportion between the
disk-radius and the brachial radius is as 1: 3. The
paxillæ on the abactinal surface are rather scattered, but on
the rays, form regular series. The interbrachial space is
beset with a few spines but is otherwise bare. Along the
ambulacral furrow, there occurs a series of spines. From
each ambulacral plate, 3—5 spines, placed lengthwise,
proceed, facing inwards, towards the furrow. Outside the
furrow, there is a similar number of spines, placed
transversely. 28 small ventro-marginal plates, carrying
penicilli-form paxillæ. The abactinal colour is dark red. The
actinal colour is white.
6*
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