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19
fladen, temmelig smal og lidt konkav, tæt besat med
Zooider, der strække sig lancetformigt imellem Polyperne mod
Ventralfladen, Fig. 10, a. Sidefladerne ere næsten imaginære.
Racliis bærer 7 udviklede Polyper og 1 embryonal.
Terminalpolypen sidder midt paa Dorsalfladen, noget
under Enden af Racliis, Fig. 9, b. 10, &*, dens Krop er 7"""
lang, 3m™ bred ; Tentaklerne ere lidt længere end Kroppen.
Til hver Side af Terniinalpolypen, paa Rygfladen,
udspringe 2 Polyper, der ere 10""" lange, 4mm brede, med
15""" lange Tentakler, Fig. 9, c. 10, c. Lige under
Terminalpolypen, men lidt til høire Side af Rygfladen, sidde
to mindre Polyper, den ene nedenfor den .anden. Disse
Polyper ere 7’"’" lange, 3’""’ brede; Tentaklerne lidt
længere end Kroppen, Tab. V, Fig. 9, d. Tab. VI, Fig. 10, d.
Ved Grunden af Terminalpolypen sees en liden, rund,
knop-form ig Forhøining med en liden Aabning i Midten — en Polyp
i Udvikling, Fig. 10, e. En lignende Knop, men noget
større, iagttages imellem den nederste af de 2 smaa
Polyper og venstre Sidepolyp.
Dorsalfladen af Racliis er saa fordreiet og kort, at
neppe 3m,"s Længde kan sees, og fra dens Sider strække
sig lancetformede Zooidefelter imellem Polyperne uden at
gaa op paa disse. Af saadanne Felter er der 2 paa
venstre og 1 paa høire Side.
Polyperne ere ligesom paa de 2 foregaaende
kon-traktile, udspringe umiddelbart fra Racliis, have en
cylindrisk, glat Krop, paa hvis udvendige Flade sees 8 Længde
linier, som angive Insertionsstederne for Septa. Det lange,
foldede Svælg skinner igjennem Kropsvæggen.
Tentaklerne, Mundskiven, Munden og Læberne som
hos No. 1 og 2. Axen ligesaa.
Den bilaterale Symetri, som vi fandt saa stærkt,
udpræget hos No. 1, er mindre fremtrædende hos No. 2 og
endnu mindre hos No. 3, hvor det endog er noget
vanskeligt at paavise den, da Rachis er saa fordreiet og
udvidet i Bredden, ja vi kunne gjerne sige saa uformelig, at
det kun med Møie lader sig gjøre at ordne nogenlunde
Polypernes Stilling.
with zooids (PI. V, fig. 9. b). The dorsal surface is,
about half as long as the ventral surface; rather narrow,
and somewhat concave; and closely beset with zooids, which
extend themselves, in lancet form, between the polyps,
towards the ventral surface (Pl. VI, fig. 10, a). The
lateral surfaces are almost imaginary.
The rachis carries, 7 fully developed polyps, and one
embryonal polyp. The terminal polyp, is situated, in the
middle of the dorsal surface, a little below the extremity
of the rachis (Pl. V. fig. 9, b*, Pl. VI. 10, b). It’s body
is 7",m long, and 3""" broad. The tentacles are a little
longer than the body. At each side of the terminal
polyp, upon the dorsal surface, 2 polyps proceed; these are
10""" long, and 4’""’ broad, with 15""" long tentacles (Pl. V,
fig. 9, c. Pl. VI, 10, c). Just beneath the terminal polyp,
but, a little to the right side of the dorsal surface; 2
small polyps are situated, one placed below the other.
These polyps are 7mm long, and 3’""’ broad, and the
tentacles are somewhat longer than the body (Pl. V, fig. 9, d.
Pl. VI, 10, d). At the base of the terminal polyp, a
small, round, knob-formed protuberance is seen; having a
small aperture in the middle; this is a polyp in process
of development (Pl. VI, fig. 10, e). A similar knob, but
somewhat larger, is observed between the lowest of the
two small polyps, and the left lateral polyp.
The dorsal surface of the rachis is so twisted, and
short, that barely 3’"’" of its length is visible; and from
its sides, lancet formed zooidal areas extend themselves
between the polyps, without, however, interfering with these.
There are two such zooidal areas on the left side, and
one on. the right side.
The polyps are, as was also the case, with the two
previous specimens, contractile; and proceed immediately
from the rachis. They have a cylindric, smooth body,
upon whose exterior surface, 8 longitudinal lines are seen,
denoting the points of insertion for septa. The long,
folded, gullet, appears visible through the Avail of the
body.
The tentacles, oral disk, oral aperture, and labiæ, are
similar to these parts in No. 1 and 2 specimens. The
axis is also similar.
The bilateral arrangement which is found so
distinctly marked in No. 1 specimen, is less prominent in
No. 2 specimen, and still less, in No. 3 specimen; where,
it is, even, somewhat difficult to point it out, OAving to the
rachis being so twisted and expanded in breadth; indeed,
Ave may say, it is so shapeless, that it is, only, with difficulty,
that the position of the polyps, can be in any measure
defined.
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