6 
Leddefiader for Tangen, Fig. 7, a. 8, a. Kjæverne ere 
langstrakte, brede forneden, ende foroven 1 en Spids og ere 
forsynede med fine Tænder langs deres indre Rande, Fig. 
Up ld & . 
Pedicellarierne, der omgive Piggene paa de to distinkte 
Rekker udenfor Furepiggene, ere alle korsformige (Pédi- 
cellaires croisés), stilkede og adskille sig ikke væsentlig fra 
denne Form hos Asterider med 4 Rader Fodder, Fig. 6. 
Paa Armenes Ryg og tildels paa Siderne findes over- 
alt ved Piggenes Grund dels enkeltvis, dels smaa Hobe af 
korsformede Pedicellarier; men foruden disse træffes ogsaa 
her en tredie Form, der vel er lige, men ganske forskjel- 
lig fra dem, som sees langs Ambulacralfuren. 
Denne tredie Form Pedicellarier, der ere meget spar- 
somme og altid isolerede, have en Lyreform, Fig. 9. Ba- 
saldelen er halvrund, indtager en Trediedel af Pedicellariens 
Længde, har paa den øverste, næsten lige Rand en lidt af- 
rundet Midtdel, Fig. 9,a.10,a. Kjæverne ere meget brede 
med indskaarne Sider og paa deres øverste Halvdel ere de 
indvendig forsynede med 3—4 Tverrækker fine Tænder, 
imedens den hele ydre Flade har 5 Længderækker Vacuoler. 
Siderandene ere glatte, men den øverste, afrundede Rand 
synes at være tandet, Fig. 9, b. 10, 0. 
Hudskelettet dannes af større og mindre, langstrakte, 
rundagtige Kalkstykker, der, idet de føie sig sammen, danne 
et uregelmæssigt, stærkt Bjelkenet' med store Masker, hvori 
sees Tentakelporer, Fig. 4. 5. Disse Kalkbjelker bære en 
eller flere Pigge, alt efter deres Størrelse. 
Naar Søstjernen er tørret, rage Kalkstykkerne op over 
Huden og danne Kamme, der gaa mere eller mindre paa- 
tvers af Armen, Fig. 2. 
Henimod Ambulacralfuren antage Kalkstykkerne baade 
en mere regelmæssig Form og Anordning. De danne her 
to distinkte Længderækker og ligge taglagte paa hverandre, 
Fig. 11. Kalkstykkerne i den indre Række ere temmelig 
flade, triangulære, Fig. 11,a, og støde med sin indre, brede 
Rand umiddelbart til to*Ambulacral- og Adambulacralplader, 
Fig. 11, b, c. Paa deres ydre Flade bære de to Pigge, 
der staa efter hinanden og hjælpe til at danne den første 
Række Pigge udenfor Furepiggene. Disse Kalkstykker kunne 
betragtes som ventrale Randplader. 
Kalkstykkerne 1 den ydre Række er næsten T-formige, 
Fig. 11, d, og støde med den brede Del til de ventrale 
Randplader, hvoraf de for en liden Del dækkes, Fig. 11, a, 
imedens den smalere Ende støder til de almindelige, lang- 
strakte Kalkbjelker, Fig. 11, e, der danne Hudskelettet. 
Paa deres ydre Flade bære de to Pigge, der staa ved Siden 
af hinanden og hjælpe til at danne den anden Række Pigge 
udenfor Furepiggene. Disse T-formige Kalkstykker kunne 
betragtes som dorsale Randplader. 
Adambulacralpladerne ere temmelig smaa, fladtrykte, 
erance occurs. The sides furnish articulatory surfaces 
(figs. 7, a. 8, a). The jaws are long, broad at the base, 
and terminate anteriorly in a point; they are, along the 
inner edge, furnished with minute teeth (figs. 7, b. 8, 0). 
The pedicellariz which environ the spines of the two 
distinct series found outside of the furrow-spines, are all 
cruciform pedicellariæ, (Pédicellaires croisés) and are seated 
on peduncules. They do not essentially differ from those 
pertaining to Asteridæ having 4 rows of suckers (fig. 6). 
On the abactinal surface of the rays, and, partly, also 
on their lateral surfaces, cruciform pedicellariæ are every 
where visible; appearing at the base of the spines, partly 
singly, and, partly, in small clusters. Besides these, there 
is also found a third form of pedicellariæ, which although 
apparently rectiform, is yet quite different from those visible 
along the ambulacral furrow. 
This third form of pedicellariz is lyrate, occurs much 
less frequently, and is always isolated (fig. 9). The basal 
part is semicircular and extends over a third part of the 
whole length; on the superior nearly straight margin there 
is a slightly rounded medial part (figs. 9, a. 10, a). The 
jaws are very broad, with hollowed sides, and their superior 
halves are supplied on the interior, with 3—4 transverse 
series of minute teeth, whilst the entire exterior surface 
has 5 longitudinal series of vacuola. The lateral margins 
are smooth, but the superior, rounded margin, appears to 
be denticulate (figs. 9, b. 10, 5). 
The dermal skeleton is formed of smaller, and larger, 
elongate, rounded calcareous ossicles, which, by abutting on 
each other, form an irregular, strong, reticulation, with large 
meshes in which tentacular pores are visible (figs. 4, 5). 
These ossicles carry one or more spines according to their 
size. 
When the starfish is dried, the calcareous ossicles 
project beyond the integument, forming ridges, which extend 
across the rays, in a more or less transverse direction, 
Towards the ambulacral furrow, the calcareous ossicles 
become more regular, both in form and arrangement. In 
this situation, they form two distinct, imbricate, longitudinal 
rows (fig. 11). The calcareous ossicles of the inner row 
are triangular and somewhat flat (fig. 11,a). Their broad 
inner margin abuts upon two ambulacral and adambulacral 
plates (figs. 11, b, c). On the outer surface they carry 
two spines, one situated behind the other, and these assist 
in forming the first furrow-series. These calcareous ossicles 
may be considered to be ventro-marginal plates. 
The calcareous ossicles of the outer row, approach 
in form to the letter T, (fig. 11, d), and their broad part 
abuts on the ventro-marginal plates, and is partly covered 
by these (fig. 11, a), whilst, the narrow extremity abuts on 
the ordinary elongate rods, which form the dermal skeleton 
(fig, 11, e). On their external surfaces they carry two 
spines, placed side by side, which assist to form the fur- 
row-series. These tee-formed calcareous ossicles may be 
considered to be dorso-marginal plates. 
The Adambulacral plates are rather small, flattened, 
