Tab. XIII, Fig. 10. 
— ll. 
— 13. 
— 14. 
— 15. 
— 16. 
— 17. 
Meo, SONY, 1842, il, 
18. 
at en Paxille i den indre Række; ¢, 
Naalene paa samme Paxille. 
En Ambulacralplade, forstørret. a, 
Midtpartiet; b, den øverste, articulerende 
Flade; c,.den transversale Proces. 
To Ambulacralplader, der med deres 
transversale Processer forene sig med 
Adambulacralpladerne, forstørret. a, b, 
c, som paa Fig. 10;.d, Adambulaeral- 
plade; e, Artikulationsfladen paa den 
øverste Ende; f, ‘den nederste Ende, der 
sig kugleformigt til Siderne; 
g, Artikulationen for den lange Kalk- 
naal; h, Piggen imellem de lange Kalk- 
udvider 
naale. 
Tre Ambulacralplader forenet,  for- 
storret. a, Midtpartiet: 0, den øverste, 
artikulerende  Flade; c, transversale 
Processer med deres halvrunde Indsnit. 
Imellem disse Processer 
ger for Fødderne. 
To Adambulacralplader, seet fra Siden, 
forstørret. a, Artikulationsfladen paa 
den øverste Ende; 0, Artikulationsfla- 
den paa den underste Ende; c, Arti- 
sees Aabnin- 
kulationsfladen for den lange Kalknaal; 
d, de to Ambulacralpigge. 
Et Stykke af den ydre Ryghud, for- 
størret. a, Aabning; 0, Muskelbund- 
ter; c, Epithelialfortykkelse i Aabnin- 
gens Rand. 
Det øverste Stykke af en Paxille med 
3 Naale tillige med en Del af den ydre 
Ryghud, forstørret. a, Aabninger; 0, 
Bindeveevshud med Muskelfibre; c, Mu- 
skelfibre; d, Aabning halv tildækket. 
Et Stykke af den ydre Ryghud, seet 
fra den indre Flade, forstørret. a, Aab- 
ning; b, Muskelbundter ; c, Muskulhu- 
den, der paa den indvendige Flade 
strækker sig udover endel af Aab- 
ningen. 
Den lange Kalknaal, der udspænder 
Bughuden, forstørret. a, Basaldelen; 
b, Ledfladen; c, de fine Kalkstave, der 
danner Naalen. 
Nogle Finner af Pteraster militaris, for- 
størret. a, Spalte imellem Finnerne; 
b, Klappen, der lukker den; c, en af- 
slaaet Finne. 
Kalkpiggen, indesluttes i 
nævnte Klappe hos Pteraster militaris. 
a, Ledflade. 
som den 
Bathybiaster pallidus 1 naturlig Storrelse. 
116 
PI. XIII, fig. 10. 
— 11. 
— 12. 
— 13. 
— 14. 
— 16. 
— 18. 
Pl. XIV, fig. 1. 
s, Basal part of a paxilla of the inner ser- 
t, Needles of the same paxilla. 
a, The 
108. 
An ambulacral plate; magnified. 
mesial part. 0, The superior articulating 
surface. c, Transverse process. 
Two ambulacral plates, united by trans- 
verse processes to the adambulacral plates; 
magnified. «a,b,c, The same as in fig. 10. 
d, Adambulacral plate. e, Articulatory 
surface on the superior extremity. /, 
The extremity, which expands 
laterally, in spherical form. g, The arti- 
culatory surface for the long calcareous 
needle. 
lower 
h, Spine between. the long calcar- 
eous needles. 
Three ambulacral plates united; magnified. 
a, Mesial part. 6, The superior articula- 
tory surface. c, Transverse processes with 
their semi-circular cavities. Between the 
processes small openings for the suckers 
are seen. 
Two adambulacral plates, lateral aspect; 
magnified. då, Articulatory surface on the 
superior extremity. 0, The articulatory 
surface on the inferior extremity. c The, 
articulatory surface for the long calcareous 
needle. d, The 2 ambulacral spines. 
A portion of the exterior dorsal integu- 
ment; magnified. a, Aperture. 06, Muscu- 
lar bundles. c, Tumified marginal epi- 
thelium of the aperture. 
The superior part of a paxilla, with 3 
needles, and a portion of exterior dorsal 
integument; magnified. a, Apertures. 0, 
Connective-tissue membrane with muscular 
fibres. c, Muscular fibres. d, Aperture, 
half covered. 
A portion of the outer dorsal integument, 
interior aspect; magnified. a, Aperture. 
b, Muscular bundles. c, Muscular integu- 
ment, which on the interior surface, ex- 
tends over a portion of the aperture. 
The long calcareous needle which ex- 
pands the ventral integument; magnified. 
a, The basal part. b, The articulatory sur- 
c, The slender calcareous rods form- 
ing the needle. 
Some fins of Pteraster militaris; magni- 
fied. a, Fissure between the fins. 6, The 
flap which covers it. c, An extended fin. 
face. 
The calcareous spine which is encased in 
the flap, in Pteraster militaris. a, Articul- 
atory surface. 
Bathybiaster pallidus; natural size. 
