Asterias Normani*, n. sp. 
Tab. VI. Fig. 1—9. 
En liden, femarmet Søstjerne, hvis Diameter er 20"”, 
Den lille Radius forholder sig til den store som 1:31, 
Jie, Il, B | 
Ryggen noget hvælvet, overalt besat med isolerede, 
fremragende, noget fladtrykte, takkede, ovale Pigge, der ere 
bredere foroven, Fig. 2. 3, a. Disse Pigge ‘ere som sæd- 
vanligt tæt omsluttet af en tynd, gjennemsigtig Membran 
(Forlængelse af Huden), Fig. 3, b; men desuden ere de 
omgivne af en særegen rørformig Hudskede, der fuldkom- 
men omfatter Piggens nederste Del, Fig. 3, c, men udvi- 
der sig opad, hvorved den øverste Del af Piggen ligger 
blottet, saa at, naar Randen af den udvidede Skededel 
bøier sig indad, Fig. 3, d, opstaar der en Hulhed, hvori 
Piggen staar ligesom i en Nische, Fig. 3, e. Denne sær- 
egne Skede kan ikke alene slaa sig om den hele Pig og 
ganske skjule den med Undtagelse af dens øverste Spids, 
Fig. 4, a, men den kan trække sig sammen efter Læng- 
den, hvorved saagodtsom hele Piggen blottes, og da sees 
Skeden som en smal Ring, omgivende Piggens Basaldel, 
Fig. 4, 0. Imellem Piggene sees isolerede Tentakelror, 
som ere temmelig store og have fuldkommen Æegformen, 
Fig. 4, c. | 
Paa Skiven staar Piggene tættere og uregelmæssigere 
end paa Armene, ligesom Tentakelrørene ere der sparsom- 
mere. 
Analaabningen, Fig. 2, der er subcentral, er omgiven 
af smaa Pigge af samme Form og forsynet med lignende 
Skede, som de tidligere omtalte. 
Madreporpladen, der ligger temmelig nær Armvinkelen, 
er næsten rund, lidt ophøiet og har 1 Randen et straalet 
Udseende, Fig. 2. 
Paa Armenes Ryg staa Piggene noget mere regel- 
mæssigt og have Tendens til at danne Længderækker, 
hvilket ogsaa er Tilfældet med Tentakelrørene. Armenes 
Rand er forsynet med 2 Rækker Pigge, en der tilhører 
Rygsiden, og en Bugen. 
De dorsale Randpigge ere noget større end Piggene 
paa Ryggen af Armene, og i Rummet imellem to af disse 
Pigge sees et ægformigt Tentakelrør, der altsaa her dan- 
ner en regelmæssig Række. Enkelte af de dorsale Rand- 
pigges Skeder bære paa deres øverste Del af den ydre 
Flade en korsformet Pedicellarie, der senere skal beskrives. 
De ventrale Randpigge ere de længste, staa lige over- 
1 Fortseettelse. Se Nyt Magazin for Naturvidenskaberne XX VIT 
Bind, 3. Hefte, pag. 267. 
Den norske Nordhavsexpedition. Danielssen og Koren Asteroidea. 
Asterias normani*, n. sp. 
Pl. VI, figs. 1—9. 
A small, 5-rayed starfish, whose diameter is 207”. The 
disk radius bears to the brachial radius, the proportion of 
as 1:31/3 (figs. 1, 2). 
The abactinal surface is somewhat rounded, and is, 
everywhere, beset, with isolated, protuberant, somewhat flat- 
tened, aculeated, oval spines, with a broad expanded basal 
section (figs. 2, 3, a). As is generally the case, these 
spines are closely enveloped by a thin translucent mem- 
brane, (extension of the integument) (fig. 3, 0) but, they 
are also surrounded, by a peculiar tube-formed integumental 
sheath, completely including the basal portion of the spine, 
(fig. 3, ¢) but, which expands above, exposing the superior 
portion of the spine. When the margin of the expanded 
sheath is invaginated (fig. 3,d), there is formed a cavity, 
in which the spine is placed as if in a niche (fig. 3, e). 
This peculiar sheath, is able, not only to envelope the 
entire spine, and completely conceal it with the exception 
of its extreme point (fig. 4, a), but, it can also retract upon 
itself, exposing nearly the whole of the spine, and, it then 
appears, as a narrow: ring, surrounding the basal portion of 
the spine (fig. 4, b). Between the spines, isolated tentac- 
ular tubes are visible; these have an ovate form, and are 
rather long (fig. 4, 0). 
On the disk, the spines are placed closer, and more 
irregularly than on the rays, and the tentacular tubes, are, 
also, in this situation, less numerous. 
The anal aperture (fig. 2) is submesial, and is sur- 
rounded by spinelets of the same form, and with a similar 
sheath as those just previously spoken of. 
The madreporite is situated rather near to the inter- 
brachial angle, and is almost circular, slightly elevated, 
and has a radiated appearance on its margin (fig. 2). 
On the abactinal surface of the rays, the spines are 
placed somewhat more regularly, and have a tendency to 
form longitudinal series, which, also, is the case with the 
tentacular tubes. The margins of the rays are furnished 
with 2 series of spines, one of which pertains to the 
abactinal, and one to the actinal surface. 
The dorso-marginal spines, are somewhat larger than 
the spies on the abactinal surface of the rays, and in the 
interspace between each pair of these spines, there appears 
an ovate-formed tentacular tube, and these, therefore, form, 
in this situation, a regular series. A few of the sheaths 
of the dorso-marginal spines, carry, upon the superior exter- 
ior surface, a cruciform pedicellaria which will be described 
subsequently. 
The ventro-marginal spines are the longest, and are 
1 Fortsettelse. Se Nyt Magazin for Naturvidenskaberne XX VII 
Bind, 3. Hefte, pag. 267. 
