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6
og forsynede med Pinnuler. Mundskiven lidt hvælvet og i
dens Centrum en aflang Mundaabning.
Paa et Exemplar, der er 60""" langt, og hvor Hachis
er 40""", er der paa hver Side af Midtfuren 20 Finner
med fuldt udviklede Polyper og 16 med uudviklede;
nedenfor disse optræder en Række med enkeltstaaende
Zooi-der, der strække sig langt nedover den bulbøse Del, indtil
omtrent 16""" fra dennes Ende, der danner en aflang,
blæ-reformig Udvidning.
Farven.
Baade Stok, Finner og Polyper melkehvide.
Findested.
Station 18, 251, nogle Exemplarer.
twice as long as the body, and are rather thick at the
base, and furnished with pinnulæ. The oral disk is a
little arched, and there is an oblong oral aperture in its
middle.
In a specimen measuring 60""" long, and in which
the rachis measures 40""" long, there are 20 fins with fully
developed polyps; and 16 fins with undeveloped polyps:
situated on each side of the middle furrow. Below these,
a series of isolated zooids appears; that extends a long
way down over the bulbous part, until within about 16"""
from its extremity; which latter forms an oblong vesicular
dilation.
Colour.
The stalk, fins, and polyps, are all milky-white.
Habitat.
Stations No. 18, No. 251, A few specimens.
Anatomisk-histologislc Bygning af Slægten Svava.
Sarcosomaet er tyndt paa Rachis, men bliver noget
tykkere i den bulbøse Del, hvor det er 0,178""" bredt.
Dets ydre Flade er beklædt med et Epithel, Fig. 13, c,
bestaaende af flere Lag temmelig smaa, polyædriske Celler
forsynede med Kjerne og et rigt Protoplasmaindhold.
Indenfor Ectodermet er et forholdsvis bredt, hyalint
Binde-vaivslag, Fig. 14, a, hvorfra udgaa listeforniige
Forlamgel-ser, Fig. 14, b, til det indre Bindevæv, som i Forbindelse
med dette danner Hudens Længdekanaler, Fig. 14. Paa
begge Sider af Bindeva’vsprolongationerne fæste sig
Længde-muskler, Figs 14, c. Det indre Bindevævslag er ligeledes
hyalint og danner Tverkanalerne; paa dets indre, frie Væg,
der støder til Hovedlængdekanalérne, er det beklædt med
et Epithel, Fig. 14, cl, bestaaende af. flere Lag smaa, runde
Celler med en yderst tynd Membran og en temmelig stor,
rund Kjerne, omgiven af spredte Protoplasmakorn. Saavel
Længde- som Tverkanalerne i Sarcosomaet ere beklædte
med Epithel, hvis Celler i Længdekanalerne svare ganske
til dem, der findes paa Sarcosomaets indre Flade, og som
tidligere ere omtalte, imedens Cellerne i Tverkanalerne ere
mere aflange og have en lidt aflang Kjerne. Overalt er
det hyaline Bindevæv gjennemtrængt af større og mindre
Ernæringskanaler, der som sædvanligt ere beklædte med
Epithel (Entodermceller), som i de mindste Kanaler udfylde
ganske Lumenet. Imellem Sarcosomaets Længde-og
Tver-kanaler er der rigelige Anastomoser, og da der paa den
indre Sarcosomaweg er en Mængde smaa Aabninger, som
stode umiddelbart til de 4 Hovedlængdekanaler, saa er der
en udbredt Kommunikation for det hele Cirkulationssystem.
Anatomo-lvistological structure of the genus Svava.
Tho sarcosoma is thin on the rachis, but becomes
somewhat thicker in the bulbous part; where, it measures
0.178""" broad. Its exterior surface is clad with an
epithelium, (fig. 13, c) consisting of several layers of, rather
small polyhedrons cells, furnished with nuclei, and a rich
protoplasmic contents. Within the ectoderm, there is a
proportionally broad, hyaloid, connective-tissue layer, (fig.
14, a) from which, fillet-formed prolongations proceed (fig.
14, b) to the inner connective-tissue, that in connection
with the former, forms the longitudinal canals of the
integument (fig. 14). On both sides of the connective-tissue
prolongations, longitudinal muscles are attached (fig. 14, c).
The inner layer of connective-tissue is also hyaloid, and
forms the transversal canals. On it’s inner free wall, which
abuts on the main longitudinal canals; it is clad with an
epithelium (fig. 14, d), consisting of several layers of small
round cells, with an extremely thin membrane; and a
rather large, round nucleus; surrounded by scattered
protoplasmic granules. Both the longitudinal and transversal
canals of the sarcosoma, are clad with epithelium, and, in
the longitudinal canals; its cells, entirely correspond with
those, which are found on the inner surface of the
sarcosoma, and which have previously been spoken of; whilst,
it’s cells in the transversal canals, are more oblong, and
have a somewhat oblong nucleus. The hyaloid connective
tissue is everywhere penetrated, by larger or smaller
nutrient canals; which, as usual, are clad with epithelium
(Entoderm cells), which in the smallest canals quite fills
up the passage. Between the longitudinal and transversal
canals of the sarcosoma, there are abundant anastomozes,
and, as there are upon the inner wall of the sarcosoma,
a multitude of small apertures, which abut immediately
upon the four main longitudinal canals; there is, thus, a
diffusive communication for the whole circulatory system.
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