Artskarakter. 
Polypcellerne, der ere lange, traktformige 
deres Aabnings fri Rand have 3 Tænder, sidde i Tverrækker 
(3 i hver) saaledes, at Midtcellen indtager Midtpartiet af 
Dorsalsiden og staar lidt høiere end de to laterale Celler. 
Zooider imellem Midteellen og Sidecellerne og ofte op paa 
den første. Ventralfladen har et bredt, nøgent Midtbelte ; 
til hver Side at dette Række Zooider. Rachis svagt 
eulrod. — Polypeellerne ved Grunden smuk teglstensrøde. 
Polyperne vandklare. 
og paa 
en 
Protoptilum Mohni*, n. 
Tab. IIT, Fig. 1—7. 
mn 
p: 
Stokken er saagodtsom hel, kun paa den nederste 
Ende af Bulbus er Sareosomaet afrevet, men Axen er 
uskadt. 
Stokkens Længde er 150””, deraf udgjor Rachis 75”. 
Stilkens bulbøse Del er smal, kun 2”” bred paa det Bre- 
deste, Fig. 1; om den ender i en rund Blære eller 1 en 
aflang Bulbus, kan ikke afgjøres. 
Rachis er paa Midten omtrent 2”” bred; nedad bliver 
den smalere, og dens øverste Ende er blottet for Sarcosoma 
1 en Udstrækning af 13"”, hvor altsaa Axen fremtræder 
aldeles nøgen, Fig. 1. 
Dorsalfladen er lidt hvælvet, hvilket især er tydeligt 
paa den nederste Del af Rachis. De udviklede Celler 
sidde meget uregelmæssigt, — saaledes er der paa den 
nederste Del af Rachis kun 2 Geller, en paa hver Side, 
og her er Midtlinien af Dorsalfladen optagen ar 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. 1,4. Hndnu længere 
oppe paa Rachis tiltager Antallet af Celler, hvilke staa i uregel- 
mæssige Rækker, dels 3 paa høire Side, I paa Midten og I 
paa venstre Side, dels 3 og 2, og endelig øverst oppe 3 
paa hver Side og I paa Midten af Dorsalfladen. Neden- 
for de udviklede Celler optræder paa hver Side en paa- 
skraasgaaende Række uudviklede Celler, 3 i hver, og under 
dem sees en næsten paatversgaaende Række, hvori er 2 
Celler, og endelig er der kun 1 Celle. Imellem de Ræk- 
ker, hvori der er 3 Geller, og som gaa fra Ventral- til 
Dorsalfladen, iagttages enkelte Celler; men ingen Zooider 
findes der, Fig. 1. De ‘udviklede Geller derimod synes at 
have en modsat Retning, nemlig fra Dorsal- til Ventral- 
fladen. 
3— 4. Nederst paa Rachis staa Cellereekkerne noget fra 
Rækkerne staa afvexlende overfor hinanden, Fig. 
' Arten opkaldt efter Professor, Dr. H. Mohn, Medlem af den 
norske Nordhavsexpedition. 
65 
Specific Character. 
The 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 ot 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. 
19, 100, Mess l=% 
The stalk is almost complete, and only, upon the 
inferior extremity of the bulb is the sarcosoma torn away, 
but the axis is left unmjured. 
The length of the stalk is 1507”; of 
occupies 75™”, 
which, the rachis 
The bulbous part of the 
and only, 2”” broad at its broadest part 
stem is narrow, 
(fig. 1); 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 sarcosoma for an extent of 137”, and there, 
therefore, the axis appears perfectly bare (fig. 1). 
The dorsal surface is a little arched, and this is, most 
The devel- 
oped cells are ‘situated, very irregularly, so that, on the 
distinctly, seen on the lower part of the rachis. 
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 by zooids and undeveloped 
cells (fig. 1). Somewhat further up, there are 3 cells, of 
which, the one, is a little smaller than the two others, and 
Still 
further up the rachis, the cells become more numerous, 
occupies the middle of the dorsal surface (fig. I, @). 
and are situated in irregular series, sometimes, 3 on the 
and 1 on the left side; 
sometimes, 3 and 2, and finally, at the top, 3 on each 
the Below 
the developed cells, a diagonal series of undeveloped cells 
right side, 1 in the middle, 
side, and I in middle of the dorsal surface. 
appears on each side, 3 in each series, and below them, 
a nearly transversal series consisting of 2 cells, is seen; 
Between the series 
in which there are 3 cells, and which proceed from the 
the 
but no zooids are seen there (fig. 1). 
and finally, there occurs only one cell. 
ventral to dorsal surface; a few cells are observed, 
The developed cells 
on the other land, appear to have an opposite direction, 
1 This species has been named after. Professor Dr. H. Mohn, a 
member of the Norwegian North-Atlantic Expedition. 
