Fig. 7, e. Midtpartiet forlenger sig opad imod Midtdelen 
af de øverste Interbrachialplader, Fig. 9, g. Fra deres 
nederste Ende udgaa ligeledes 3 Processer, en til hver 
Side, Fig. 9, h, og en i Midten, Fig. 9, 7. Sideproces- 
serne ere meget brede og lange, gaa til Siderne udad og 
nedad under Armene, hvor de feste sig til den anden 
Adambulacralplade paa hver Side af to Arme, Fig. 9, h. 
Den midterste Proces derimod bøier sig indad og under 
mod Munden, hvor den slutter sig til Mundvinkelpladen (de 
første Adambulacralplader fra to tilgrændsende Arme). 
Samtlige disse Kalkstykker bindes til hverandre ved Hjælp 
af den indvendige, membranøse Ryghud, der danner lige- 
som Ligamenter om Sammenfømingerne. 
Foruden de ovenbeskrevne Anal- og Iste Brachial- 
paxiller, der for endel indtage Ryggens Centrum, findes der 
langs hver Side af Armenes Ryg 8—10 Par Paxiller, Fig. 
1. 9, af hvilke omtrent Halvparten nærme sig Armens 
Midtlinie og danne en indre Række, Fig. 9, k, imedens de 
øvrige, der danne den ydre Række, Fig. 9, 1, strække sig 
udover Interbrachialrummet. 
Paxillerne i den ydre Række adskille sig fra dem i 
den indre derved, at Basaldelen har to Rødder. Af disse 
Paxiller er den inderste, nærmest Armvinkelen den stør- 
ste; dens Basaldel har to meget lange, krumbøiede Rød- 
der, hvorat den ydre, Fig. 9, m. strækker sig hen til den 
underste Interbrachialplade, til hvis underste Sideproces, 
Fig. 9,h, den fæster sig, imedens den indre Rod, Fig. 9, n, 
støtter sig 
plade, Fig. 
til Tverprocessen af den 4de og 5te Ambulacral- 
9,0. Herved dannes et aflangt Rum paa Si- 
den af Armens Grunddel, hvilket begrændses udad af den * 
2den Armpaxilles Basaldel og indad mod Armens Midte 
af Ambulacralpladerne, og hvori Æggestokken eller Testi- 
kelen er placeret. De ovrige Armpaxiller i den ydre 
Række ere kortere, deres Basaldel har to kortere, krum- 
bøiede Rødder, hvoraf den ydre, Fig. 9, p, fæster sig paa 
Adambulacralpladerne, imedens den indre, fig. 9, g, paa 
Ambulacralpladens Tverproces. Rødderne ere stillede saa- 
ledes, at de danne en Bue. Skaftet paa disse Paxiller er 
ved Grunden rundt, men fladtrykt paa Midten, Fig. 9, I, 
og har paa sin brede, halvrunde Ende smaa Articula- 
tionstlader for de 7, (4 lange og 3 korte) Kalknaale, der 
sidde i en aflang Krands og vifteformigt udbrede sig i In- 
terbrachialrummenes Ryghud, Fig. 1, c. 9, 7. 
Paxillerne 1 den indre Række, Fig. 9, k, have en 
udelt, fladtrykt Basaldel, Fig. 9, s, hvis indre, lidt konkave 
Flade fæster sig til den indre Rod af Basaldelen i den 
ydre Række Paxiller, Fig. 9, q. Skaftet paa de indre 
of the five superior interbrachial plates (Pl. XIII, fig. 9, c) 
and also, with the exterior roots of the first brachial pax- 
ille (Pl. XII, fig. 7, e). The mesial part is prolonged 
upwards, towards the mesial part of the superior inter- 
brachial plate (Pl. XIII, fig. 9, g). From their lower ex- 
tremity proceed, likewise, three processes, one to each lat- 
eral margin (Pl. XIII, fig. 9, Å), and one in the middle 
(Pl. XIII, fig. 9,2). The lateral processes are very broad 
and long, extending to the margins, outwards and down- 
wards below the rays; where, they become secured to the 
second adambulacral plate on each margin of two rays (PI. 
XIII, fig. 9, h). The mesial process on the contrary; 
curves inwards and downwards, towards the oral aperture, 
and there, joins the oral angle-plate (the first adambulacral 
plates from two adjoining rays). All of these calcareous 
ossicles are united to each other, by means of the internal 
membranous dorsal integument; forming, as it were, liga- 
ments round the unions. 
Besides the previously described anal, and first brach- 
ial paxillæ, which, partly, inelude the abactinal disks middle 
part; 8—10 pairs of paxillæ (Pl. XIII, fig. 1—9) are sit- 
uated along each abactinal margin of the rays, and about 
the half of these approach the mesial line of the ray, 
forming an inner series (Pl. XIII, fig. 9, Æ); whilst the 
remainder forming the outer series (Pl. XIII, fig. 9, 2), 
spread themselves over the interbrachial space. j 
The paxillæ in the outer series, differ from those of 
The 
inner one, nearest to the brachial angle, is the largest, and 
the imner series, in the basal part haying two roots. 
it’s basal part has two very large curved roots, the exter- 
ior one of which, (Pl. XIII, fig. 9, m) extends to the in- 
ferior interbrachial plate, and is secured to it’s inferior 
lateral process (Pl. XIII, fig. 9,4). The interior one (Pl. 
XIII, fig. 9,7), abuts on the transverse processes of the 
fourth and fifth ambulacral plates (Pl. XIII, fig. 9,0). In 
this manner, an oblong space is formed on the lateral or- 
igin of the rays; exteriorly defined, by the basal part of 
the second brachial paxilla, and interiorly, towards the 
part of the ray, by the ambulacral plates. In the 
space thus formed, are placed, the ovaries or tes- 
ticles. The other brachial paxillæ in the outer series are 
shorter, and their basal part has two short curved roots, of 
which, the exterior one (Pl. XIII, fig. 9, p) is secured to 
the adambulaeral plates, whilst, the interior one (Pl. XIII, 
fig. 9, q) is secured to the ambulacral plates transverse 
process. The roots are so placed, that they form an are. 
The shaft of these paxille is round at the base, but flat- 
tened in the middle (Pl. XIII, fig. 9, 7) and it has small 
articulatory surfaces upon its broad semi-circular extrem- 
ity, for the 7 (4 long ones and 3 short ones) calcareous 
needles, which are placed in an oblong wreath, spreading 
like a fan, in the dorsal imtegument of the interbrachial 
spaces (BIS Xai tere Ohm): 
The paxille in the inner series (Pl. XIII, fig. 9, Å), 
have a compact, flattened basal part (Pl. XIII, fig. 9, s), 
whose inner, slightly coneaye, surface, is secured to the in- 
series 
mesial 
oblong 
ner root of the basal part, in the exterior paxillar 
