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Artskarakter.
Poly peel lerne, der ere lange, traktformige og paa
deres Aabnings fri Iland have 3 Tænder, sidde i Tverrækker
13 i hver) saaledes, at Midteellen indtager Midtpartiet af
Dorsalsiden og staar lidt høiere end de to laterale Celler.
Zooider imellem Midteellen og Sidecellerne og ofte op paa
den förste. Ventralfladen har et bredt, nøgent Midtbelte;
til hver Side af dette en Række Zooider. Rachis svagt
gulrød. Polypcellerne ved Grunden smuk teglstensrode.
Polyperne vandklare.
Protoptilum Moh ni \ n. sp.
Tab. III. Fig. 1—7.
Stokken ei1 saagodtsom hel, kun paa den nederste
Ende af Bulbus er Sarcosomaet afrevet, men Axen er
uskadt.
Stokkens Længde er 15U""", deraf udgjør Rachis 75’ "’.
Stilkens bulbøse Del er sinai, kun 2""" bred paa det
Bredeste, Fig. 1 ; om den ender i en rund Blaire eller i en
allaug Bul bus, kan ikke afgjøres.
Rachis er paa Midten omtrent 2""" bred; nedad bliver
den smalere, og dens øverste Ende er blottet for Sarcosonia
i en Udstrækning af 13""", hvor altsaa Axen fremtræder
aldeles nøgen, Kig. 1.
Dorsalfladen er lidt hvælvet, hvilket især er tydeligt
paa den nederste Del af Rachis. Do udviklede Celler
sidde meget uregelmæssigt, — saaledes er der paa den
nederste Del af Rachis kun 2 Celler, en paa liver Side,
og her er Multlinien af Dorsalfladen optagen af Zooider
og uudviklede Celler, Fig. 1. Noget længere oppe bliver der
3 Celler, hvoraf den ene er lidt mindre end de to andre
og indtager Midten af Dorsalfladen, Fig. I,«.. Endnu længere
oppe paa Rachis tiltager Antallet af Celler, hvilke staa i
uregelmæssige Rækker, dels 3 paa liøire Side, 1 paa Midten- og l
paa venstre Side, dels 3 og 2. og endelig øverst oppe 3
paa liver Side og 1 paa Midten af Dorsalfladen.
Nedenfor de udviklede Celler optræder paa liver Side en
paa-skraasgaaende Række uudviklede Celler, 3 i hver, og under
dom sees en næsten paatversgaaeiide Række, hvori er 2
Celler, og endelig er der kun 1 Celle. Imellem de
Rækker, hvori der er 3 Celler, og som gaa fra Ventral- til
Dorsalfladen, iagttages enkelte Celler; men ingen Zooider
tindes der, Fig. 1. De udviklede Celler derimod synes at
have en modsat Retning, nemlig fra Dorsal- til
Ventral-Haden. Rækkerne staa afvexlende overfor hinanden, Fig.
.’! 4. Nederst paa Rachis staa Cellerækkeriie noget fra
1 Arten opkaldt, efter Professor. Dr. H. Mohn. Medlem af den
norsko Nordhavsexpedition.
Specific Character.
Tile polyp cells are long, and funnel-shaped; and on the
free margin of their aperture, 3 teeth are situated. They
are placed in transversal series (3 in each) in such manner,
that the mesial cell occupies the mesial part of the dorsal
side, and protrudes a little more than the two lateral cells.
Zooids are situated between the mesial cell and the lateral
cells, and also often upon the former. The ventral surface has
a broad unoccupied mesial stripe, and at each side ol it a
series of zooids. The rachis is faint yellowish-red colour.
The polyp cells are at the base a beautiful brick-red colour.
The polyps are clear as water.
Protoptilum Mohni’. n. sp.
PI. Ill, litfs. 1—7.
The stalk is almost complete, and only, Upon the
inferior extremity of the bulb is the sarcosonia. torn away,
but the axis is left uninjured.
The length of the stalk is 150"""; of which, the rachis
occupies 75""". The bulbous part of the stem is narrow,
and only, 2""" broad at its broadest part (fig. I); whether
it terminates in a round vesicle, or. in an oblong bulb,
could not be detected.
At the middle, the rachis is about 2""" broad, but
becomes narrower downwards, whilst, it’s superior extremity
is devoid of sarcosonia for an extent of 13’"’", and there,
therefore, the axis appears perfectly bare (fig. 1).
The dorsal surface is a little arched, and this is, most
distinctly, seen on the. lower part of the rachis. The
developed cells are situated, very irregularly, so that, on the
inferior part of the rachis there are only 2 cells, one
placed on each side, and in this situation, the mesial line
of the dorsal surface is occupied bv zooids and undeveloped
cells (fig. 1). Somewhat further up, there are 3 colls, of
which, the one, is a little smaller than the two others, and
occupies the middle of the dorsal surface (fig. 1, a). Still
further up the rachis, the cells become more numerous,
and are situated in irregular series, sometimes, 3 on the
right side, 1 in the middle, and 1 on the left, side;
sometimes, 3 and 2, and finally, at the top, 3 on each
side, and 1 in the middle of the dorsal surface. Below
the developed cells, a diagonal series of undeveloped cells
appears on each side, 3 in each series, and below them,
a nearly transversal series consisting of 2 cells, is seen;
and finally, there occurs only one cell. Between the series
in which there are 3 cells, and which proceed from the
ventral to the dorsal surface; a few cells are observed,
but no zooids are seen there (fig. 1). The developed cells
on the other hand, appear to have an opposite direction,
1 This species has been named after Professor Dr. H. Mohn, a
member of the Norwegian North-Atlan’ie Expedition.
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