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Solaster glacialis, 11. sp.
Tab. VIII, Fig. 9—10. Tab. IX, Fig. 1—6. Tab. XV, Fig. 1.
Legemet er syvarmet, kun lidet hvælvet paa Ryggen.
Bugen flad. Forholdet imellem clen lille og store Radius
som 1:3. Analaabningen subcentral. Madreporpladen
rund, sidder imellem Armvinkelen og Anus, dog nærmere
den første, Tab. VIII, Fig. 9. 10, Tab. XV, Fig. 1.
Rygfladen er besat med Paxiller, der staa langt fra
hverandre, omtrent lmm, og danne regelmæssige
Længderækker paa Armene, Tab. IX, Fig. 1. 3.
Enhver Paxille har et kort Skaft, hvis øverste Del
ender i Regelen i 6 Spidser, hvoraf 5 sidde i Krands
omkring den 6te.
Imellem Paxillerne er Huden nøgen, og her sees
Aan-derørene at staa enkeltvis, Tab. IX, Fig. 3, sjeldent to
sammen og ere paa den inderste Halvdel af Armen stillede
i Længderækker; kun paa den yderste, smale Ende af
Armen findes ingen Tentakelporer.
De ventrale Randplader ere 28, kun lidet
fremtrædende og bære hver en penselformig Paxille, der hjælper
til at danne den Paxillerække, som begrændser Armen til
Siderne, Tab. IX, Fig. 4, a.
Bugfladens Interbrachialrum ere besatte med enkelte
Pigge, der staa uregelmæssige, Tab. IX, Fig. 2, a;
forøvrigt er Huden nøgen.
Langs Ambulacralfuren er paa hver Side en Række
Pigge, som udgaa fra den indre Del af
Adambulacralpla-dens undre Rand, Tab. IX,. Fig. 4, b. Fra enhver af de
4—5 inderste Adambulacralplader udgaa 4 lange Pigge,
der ere samlede ved Grunden, men gaa stærkt viftetormigt
fra hverandre ud imod Bugfuren, saaledes at de to
midterste ere de længste. Paa de øvrige Adambulacralplader
er der kun 3 saadanne Pigge. Udenfor denne Række
Furepigge sees Tverrækker af Kalkpigge, der tage sit
Udspring fra den ydre Del af Adambulacralpladens undre
Rand, Tab. IX, Fig. 4, c. De 3—4 af de inderste
Tverrækker have kun 3 Pigge, af hvilke den midterste er den
længste, Tab. IX, Fig. 2, b; de øvrige have 4 Pigge, en
og anden 5, Tab. IX, Fig. 2, c. 4, d. Imellem disse
Tverrækker og Paxillerækken, der betegner Søstjernens
Rand, er der indimod Interbrachialrummet, altsaa paa den
indre Del af Armen, en Række enkeltstaaende Pigge.
Mundpladerne have paa deres konvexe Siderande 6
Pigge, paa den inderste, afrundede Rand 4 lange Tænder, og
paa Midtpartiet 2 Rader smaa Pigge, 3—4 i hver, Tab.
IX, Fig. 2, d. 5, a.
Solaster glacialis, n. sp.
PI. VIII, ligs. 9—10. Pl. IX, figs. 1—6. Pl. XV, fig. 1.
The body is 7-rayed, and only slightly arched on the
abactinal surface. The actinal surface is flat. The disk
radius bears to the brachial radius, the proportion of, as
1:3. The anal aperture is submesial, and the madreporite
is circular, and situated between the brachial angle and
the anus, but nearer to the first named (Pl. VIII, figs. 9.
10. PI. XV, fig. 1).
The abactinal surface is beset, with paxillæ, placed
about lmm from each other; and upon the rays, these form
regular longitudinal series (Pl. IX, figs. 1—3).
Each paxilla has a short peduncle whose superior
portion usually terminates in 6 points, 5 of which are placed
as a wreath around the sixth, which becomes a centre.
The integument is bare between the paxillæ; and, in
this situation, tentacular tubes, placed singly, (Pl. IX, fig.
3) and, but seldom, two together, are to be seen. On the
interior half of the ray, they are placed in longitudinal
series. It is, only, on the extremely slender tip of the
ray that no tentacular pores are found.
The ventro-marginal plates are 28 in number, only
slightly protuberant, and carrying, each, a penicilliform
paxilla, which ■ assists in forming the paxillar series which
borders the ray laterally (Pl. IX, fig. 4, a).
The interbrachial space of the actinal surface is beset
with a few spines placed irregularly (Pl. IX, fig. 2, a), but
the integument is otherwise bare.
Along each lateral surface of the ambulacral furrow,
there is a series of spines proceeding from the inner
portion of the adambulacral plate’s inner margin (Pl. IX, fig.
4, 6). From each of the 4—5 inmost adambulacral plates,
there proceed 4 long spines, collected together at their
base, but, opening out, freely, above, in a fan-shape, and
facing outwards towards the ventral furrow, in such
manner that the mesial spines are the longest. On the
remainder of the adambulacral plates, there are only 3 such
spines. Beyond this series of furrow spines, transverse
series of calcareous spines appear, which have their origin
in the exterior portion of the adambulacral plate’s inferior
margin (Pl. IX, fig. 4, c). The 3—4 furthest inmost
transverse series, have only 3 spines, of which, the mesial
one is the longest (Pl. IX, fig. 2, b). The others have 4
spines, whilst, an occasional one has 5 spines (Pl. IX, fig.
2, c. 4, d). Between these transverse series, and the
paxillar series which defines the margin of the starfish, there
extends towards the interbrachial space; consequently, on
the inner surface of the ray, a series of spines, placed
singly.
The oral plates have 6 spines on their convex lateral
margin, and 4 large teeth on their rounded inner margin;
also, 2 series of spinelets in the mesial part, containing
3—4 spinelets in each series (Pl. IX, fig. 2, d. 5, a).
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