hinanden, sees en Spalte, der er Indgangen til nævnte Hul- 
hed, Fig. 6, d. 
Huden, som beklæder Furen, og som danner Hulhe- 
den, er egentlig en Fortsættelse af Søstjernens Hud og be- 
staar af 3 Lag: et ydre, strukturløst, Cuticula, Fig. 6, a, 
hvori fine Kalkkorn ere enkeltvis leirede, et mellemste, det 
egentlige Epithel, der dannes af Cylinderceller, og som er 
betydelig fortykket over den omtalte Bindevævsliste paa 
Læbernes frie Rand, samt Corium, der er fast, noget 
tyk, og hvori findes Bindevævs- og Muskelfibre. 
Hyor ingen saadanne Pedicellarier findes. er den 
midterste Pig altid længere end Sidepiggene i Furen. 
Foruden de ovenfor beskrevne Pedicellarier er hele 
Bugtfladens brede Interbrachialrum ligesom beklædt med 
Pedicellarier, der staa temmelig tætte i regelmæssige Ræk- 
ker, have en oval Form og se for det blotte Øie ud som 
skjælformede Papiller, Fig. 5. c. Disse Pedicellarier be- 
staar ligesom hine af et Kalkskelet, der er omgivet af en 
temmelig gjennemsigtig Hud, Fig. 8. 9.  Skelettets Basal- 
del er mere eller mindre rund, har en konkav Ledflade, 
Fig. 8, a. 9, a, der svarer til en Forhgining paa den Bug- 
plade, hvortil den er fæstet. Skelettets øvrige Del bestaar 
af. en sig opad udvidende, tyk Kalkplade, Fig. 8, b. 9. 0, 
paa hvis ene Rand iagttages en liden Fure, Fig. 9, c. 10, 
lig den, der er omtalt hos de Pediceliarier, der sidde langs 
Ambulaeralfuren, kun ikke saa dyb og lang. 
Huden, hvori Skelettet er indesluttet, er halv gjen- 
nemsigtig og danner en Spalte, Fig. 8, c. 9, d, der svarer 
til Kalkpladens Fure, og hvis tykke, hvælvede Læber, Fig. 
8, d, kunne lukkes og aabnes, hvorved en lignende Hulhed 
fremkommer som paa Bugfurens Pedicellarier; hvorvidt der 
paa de nævnte Læber findes Cilier, kunne vi ikke afgjøre 
med nogen Sikkerhed; men vi ere tilbøielige til at antage 
en saadan Anordning. Den nævnte Hud bestaar af 3 Lag: 
Cuticula, der er vandklar og strukturlos; Epithelet, der 
dannes af meget langstrakte Cylinderceller, rige paa Proto- 
plasmaindhold, Fig. 8, e, samt af Corium, der danner et 
fibrillært Bindevæv, hvori sees en stor Mængde Bindeveeys- 
legemer med mange Udløbere, der korrespondere med hver- 
andre, hvorved et smukt udbredt Net fremkommer. Ved 
Basaldelen sees stærke Muskelbundter, der synes at ud- 
gjøre selvstændige Muskler, som fester sig just paa det 
Sted, hvor Basaldelen gaar over i Kalkpladens vingefor- 
mige Udvidning, Fig. 8, e. Å 
Ogsaa paa Armenes Bueflade findes lignende Pedi- 
cellarier ; de med flade, lancetformige 
Pigge. 
men her atvexle 
Pil 
cavity is formed, whose base is the furrow of the cal- 
careous plate. If the labiæ are parted asunder, a fissure, 
forming the passage to the above named cavity, becomes 
visible (fig. 6, d). 
The integument which covers the furrow, and forms 
the cavity, is, in reality, a continuation of the integument 
of the starfish, and it is composed of three layers, viz. an 
exterior structureless layer, in which solitary, minute cal- 
careous grains (cuticula) are entrenched, (fig. 6, a) then, 
a middle layer, or the real epithelium, formed of cylindric 
cells, and considerably increased in thickness over the con- 
nective-tissue fillet at the free margin of the labiæ, and, 
finally, the third layer, or corium, which is firm, and some- 
what thick, and, in which, muscular and connective-tissue 
fibres are found. 
When no such pedicellariæ are found, the middle 
spine is always longer than the lateral marginal spines of 
the furrow. 
Besides the above described pedicellariæ, the whole 
actinal surface of the broad interbrachial surface, is also 
clad with pedicellariæ, rather closely set in regular series. 
These are ovate in form, and tothe naked eye appear like 
scale-shaped papillæ (fig. 5,¢). These pedicellariæ, consist, 
like the former, of a calcareous skeleton surrounded by a 
rather translucent integument (figs. 8. 9). The basal part 
of the skeleton, is more or less round, and has a concave 
articulatory surface (fig. 8, a. 9, @) corresponding with a 
prominence on the ventral plate. to which it is secured. 
The rest of the skeleton, consists, of a calcareous plate (fig. 
8, b. 9, b) which expands upwards, and upon one margin 
of this plate, a small furrow occurs (fig. 9,c. 10), like the 
one spoken of as pertaining to the pedicellariæ situated 
along the ambulacral furrow, only, not so deep, or long. 
The integument which encloses the skeleton is semi- 
translucent, and forms a fissure (fig. 8,c. 9, d), which cor- 
responds with the furrow of the calcareous plate; and 
whose thick tumid labiæ (fig. 8,d), may be closed and op- 
ened, producing a similar cavity as in the case of the ven- 
tral furrow’s pedicellariæ. Whither any ciliz are to be 
found on these labiæ, we are unable to state with any de- 
gree of certainty, but we are disposed to assume, that there 
is such an arrangement. The skeleton integument, consists, 
of three layers viz. the structureless pellucid cuticle, then 
the epithelium, formed of very elongated cylindric cells, rich 
in protoplasm (fig. 8, e) and, finally, the corium, which forms 
a fibrous connective-tissue, in which appear a multitude of 
connective-tissue corpuscles, with numerous prolongations 
corresponding with one another, and producing, thus, a 
beautiful expansive reticulation. Strong muscular bundles 
are seen at the basal part, and appear to form indepen- 
dent muscles, inserted, just at the point where the basal 
part passes over into the wing formed extension of the 
calcareous plate (fig. 8, e). 
On the actinal surface of the rays, similar pedicellariæ 
are also found, but they alternate, there, with flat lancet- 
formed spines. 
12* 
