og sparsomme. Basaldelen er meget bred, danner paa sin 
nederste Rand en lige Linie; den øverste Rand er afrun- 
det, og Siderandene have et lidet Indsnit, Fig. 7,a. Kjæ- 
verne ere korte, men meget brede og danne paa deres ne- 
derste Del en næsten spids Vinkel, Fig. 7, c, idet de 
smalne af mod Leddefladen. Den øverste Ende er afstum- 
pet. Hele den ydre Flade dannes af et Kalknet, Fig. 7,0, 
og paa de indre Rande, især paa deres nederste Del, sees 
stærke, fremragende Tænder, Fig. 7, d. 
De korsformede Pedicellarier have en bred Basaldel 
med meget fremstaaende Apophyser, Fig. 6, a. Tangens 
Kjæver ere kun lidet boiede, og hele den ydre Flade er 
langs Midten forsynet med Vacuoler, Fig. 6, b, imedens 
den indre Flade, ligesom Randene, have stærke, spidse 
Tender, Fig. 6, ¢ Der, hvor Kjæven gaar over i den 
forlængede Del (Tangens Arm), er en stærk Indskjæring, 
Fig. 6, d, hvorefter Delen bliver meget bred og har paa 
den afrundede Endes udvendige Flade en Samling af Tak- 
ker, Fig. 6, e. 
Hudskelettet bestaar af større og mindre, forskjelligt 
formede Kalkstykker, Fig. 8. Paa Skivens Ryg er en 
temmelig stor, noget kantet Centralplade, Fig. 8, a, der 
paa sin øvre Flade har flere smaa runde Ophgininger, 
hvorpaa Pigge ere fæstede; lige ved Randen af Pladen, 
just mod den Armvinkel, hvor Madreporpladen sidder, sees 
den lidt aflange Analaabning, Fig. 8, b. Til Centralpla- 
den støde meget smaa, lidt aflange Kalkplader, Fig. 8, c, 
der ordne sig i en Kreds omkring Centralpladen, og som 
hvile, dels paa denne, dels paa hinanden indbyrdes, idet 
de dog danne en lille Aabning imellem sig for et Tenta- 
kelrør, Fig. 8, d. 
Imellem hver Armyinkel sees en stor, noget uregel- 
mæssig Kalkplade, Fig. 8, e, til hvis indre Rand de om- 
talte smaa Kalkplader føie sig, medens den ydre og Side- 
randene er dækket af Plader fra Armene, Fig. 8, f. En 
af disse Armvinkelplader indtages: for endel af Madrepor- 
pladen, Fig. 8, g, hvis mdre Rand grændser nær til Anal- 
aabningen. 
Paa Armenes Ryg antage Pladerne Korsformen mere 
eller mindre udviklet, ligesom de her danne regelmæssige 
Længderækker, Fig. 8, h. Paa Midten af Armen er Kors- 
formen stærkest udviklet, ligesom Pladerne her ere størst 
og mere hvælvede, hvorved den førbeskrevne Kjøl frem- 
kommer, Fig. 8, 2; til Siderne blive de noget mindre 
og ere mere langstrakte; de hvile taglagte paa hverandre 
og danne smaa Masker, der staa i Længderækker og op- 
tage hver et Tentakelror, Fig. 8, k. Alle Pladerne, saa- 
vel de paa Skiven som paa Armene, have paa deres ydre 
Flade flere eller færre smaa Knuder, hvortil Piggene fæ- 
ste sig. 
few in number. ‘Their basal part is very broad, and has 
a straight inferior margin, whilst, the superior margin is 
rounded off, and the lateral margins of the basal part are 
slightly concave fig. 7, a). The jaws are so short in pro- 
portion to their breadth, that the angle formed by the 
junction of the lateral and inferior basal margin, is almost 
acute (fig. 7, ¢). By contracting in breadth towards the 
articulatory surface, lateral hollows are produced. The 
points of the forceps are blunted. The entire exterior sur- 
face is formed of a calcarous reticulation (fig. 7,0), and on 
the interior margins, especially, of their basal portions, 
strong prominent teeth are seen (fig. 7, d). 
The cruciform pedicellarie have a broad basal part 
with very prominent apophyses (fig. 6, @); the jaws of the 
forceps are only slightly curved, and the whole of the 
exterior surface is furnished with vacuola, which extend 
along the mesial line (fig. 6,0), whilst, the interior surface, 
as also, the margins, have strong acuminated teeth (fig. 6,¢). 
At the point where the jaw passes into the elongate por- 
tion, (the forceps arm), there is a deep hollow (fig. 6, d), 
beyond which, the part becomes very broad, and upon the 
rounded extremities, the exterior surface is furnished with 
a collection of aculez (fig. 6, e). 
The dermal skeleton consists, of larger or smaller var- 
iously formed calcareous ossicles (fig. 8). On the abactinal 
disk, there is a pretty large, somewhat angular, mesial 
plate (fig. 8, a), having several, small, circular prominenees 
on its superior surface, to which spines are secured. Close 
to the margin of this plate, and just opposite to the in- 
terbrachial angle at which the madreporite is situated, the 
somewhat oblong anal aperture is seen (fig. 8, 6). Some- 
what oblong, very small calcareous ossicles abut on this 
mesial plate (fig. 8,¢), and arrange themselves in a circle 
around it, partly, resting upon it, and partly, reciprocally, 
resting upon each other, but still, leaving a small inter- 
space for a tentacular tube (fig. 8, d). 
Between each interbrachial angle, a large somewhat 
irregular shaped calcareous plate (tig. 8, e) is visible; to 
the inner margin of this, the small calcareous plates al- 
ready mentioned unite, whilst, its exterior and lateral mar- 
gins, are covered, by plates pertaining to the rays (fig. 8, /). 
One of these interbrachial angle plates is partly included 
by the madreporic plate (fig. 8,g) whose inner margin ex- 
tends nearly to the anal aperture. 
On the abactinal surface of the rays, the plates be- 
come, more or less distinctly cruciform, whilst, in this situ- 
ation, they also form regular longitudinal series (fig. 8, h). 
The cruciform shape is most distinct in the middle part 
of the ray, and here, also, the plates are largest and more 
arcuate, producing thus, the previously described ridge 
(fig. 8, 2). On the lateral surface of the rays, the plates 
are somewhat smaller, and more elongated; they rest im- 
bricate on each other, forming a longitudinal series of 
small meshes, each of which receives a tentacular tube 
(fig. 8,4). All the plates, pertaining to, both, the disk and 
the rays, have, upon their exterior surface, a greater or smaller 
number of small knobs, to which the spies are secured. 
