lange, traktformige og med skjæv Aabning, paa hvis fri, lavere 
staaende Rand findes 3 Tænder. Imellem Cellereekkerne 
og tildels imellem og paa Cellerne Zooider, der ordne sig 
i Rækker paa Ventralsiden. Denne har langs Midtlinien 
en stærkt fremspringende Kjøl. Rachis er bleggul; Cel- 
lerne næsten hvide; Polyperne vandklare. 
Protoptilum armatum, n. sp. 
Tab. IV, Fie, 1—7. 
Af denne Søfjær blev fundet et Exemplar, der havde 
næsten hele Rachis godt bevaret, imedens Sarcosomaet paa 
hele Stilken var afrevet, saa at Axen var aldeles blottet, 
men forresten hel, Fig. 1. 
Hele Søfjærens Længde er 290””, I den øverste 
Ende er Axen blottet i en Udstrækning af 2”” og konisk 
tilspidset, Fig. 1. 2. 
Dorsalsiden er lidt hvælvet. Cellerne staa temmelig 
langt fra hinanden i skjæve Rækker, der gaa paaskraas 
over Ryggen fra den ene Rand af Ventralfladen til den 
anden, Fig. 2. Paa den nedre Del af Rachis bestaar hver 
Række af 3 Celler; paa Midten er der afvexlende 4 og 2 
1 hver Række, Fig. 4, og længere oppe sees i enkelte, 
meget skjæve Rækker 5, men hyppigst 3, Fig. 2, og her 
staa Rækkerne meget tættere sammen end længere nede 
paa Rachis. 
Cellerne ere smale, noget forskjellig i Størrelse paa 
de forskjellige Steder af Rachis; saaledes ere de, der ind- 
tage Midtpartiet af Dorsalfladen, mindst, imedens de, som 
staa til Siderne nærmest Ventralfladen, ere størst, Fig. 2. 4, 
nemlig 3”” lange, med sin 1”” vide, næsten halvmaane- 
formige Aabning, hvis fri Rand har 2 Tænder, Fig. 4. 5. 
Cellerne paa den øverste Del af Rachis have en mere 
rund Aabning med 3 Tænder, Fig. 2. Den indre Cellevæg 
er som sædvanligt hos denne Slægt fastvoxen til Rachis. 
Imellem Cellerækkerne sees spredte, næsten elliptisk 
formede Zooider, der enkeltvis ogsaa sees imellem Cellerne, 
Fig. 2. 4. 5, a; men til Siderne ordne de sig i Tverrækker, 
2—3 1 hver, hvilket bedst iagttages paa Ventralsiden, Fig. 
3. Dorsalfladens Midtparti er temmelig fattigt paa Zooider, 
imedens de paa Siderne og Ventralfladen ere 1 rigelig 
Mængde tilstede, Fig. 3. 4. 
Ventralsiden er flad; Midtpartiet danner et smalt, 
nøgent Belte, Fig. 3, der dreier sig noget langs hele Ra- 
chis, saa at det fremstiller en bølget Linie. Til Siderne 
towards the ventral side. In each series there are 3 cells; 
these are long, and funnel-shaped, ånd have a crooked 
aperture, upon whose free, inferior margin 3 teeth are 
situated. Between the cellular series, and partly, also, 
between the cells, and also, on the cells themselves, zooids 
occur, and these are arranged in series on the ventral side. 
Along the mesial line of the ventral surface there is a 
strongly protuberant keel. The rachis is pale-yellow in colour. 
The cells nearly white. The polyps clear as water. 
Protoptilum armatum, n. sp. 
PIL IW, ines, == 
One specimen of this sea-pen was obtained, in which, 
nearly, the entire rachis is in a good state of preservation ; 
the sarcosoma along the whole stem is, however, torn away, 
leaving the axis completely exposed, but, otherwise, complete 
(fig. 1). 
The entire length of the sea-pen is 290””, In the 
superior extremity, the axis is uncovered for an extent of 
2”m. and it is conically acuminated (figs. I, 2). 
The dorsal side is a little arched. The cells are 
situated, pretty far apart from each other, in crooked series, 
proceeding, diagonally, across the back, from the one marein 
of the ventral surface to the other margin (tig. 2). On 
the inferior part of the rachis, each series consists of 3 
cells. Inthe middle, there are, alternately, 4 and 2 cells in 
each series (fig. 4), and, further up, m a few very crooked 
series, 5 cells are seen, but, most frequently, 3 (fig. 2), and 
here, the series are situated much closer together than is 
the case further down the rachis. 
The cells are narrow, and somewhat variable in size 
on the different parts of the rachis, so that, those which 
occupy the mesial part of the dorsal surface are the smallest, 
whilst, those placed on the sides, nearest to the ventral 
surface, are the largest (figs. 2, 4), namely, 3”” long; 
they have a nearly crescent-shaped aperture 1”” wide, on 
whose free margin there are 2 teeth (figs. 4, 5). The cells 
upon the superior part of the rachis have a more circular 
aperture, with 3 teeth (fig. 2). The inner wall of the cell 
is, as usual in this genus, conereted with the rachis. 
Between the cellular series, zooids of nearly elliptical 
form are seen, dispersed, and they are, also, observed, placed, 
singly, between the cells (figs. 2, 4, 5, a), but to the sides 
they become arranged in transversal series, 2—3 in each 
series; this is best observed on the ventral side (fig. 3). 
The mesial part of the dorsal surface is rather poorly sup- 
plied with zooids, whilst, upon the sides, and on the ventral 
surface, they are present in rich abundance (figs. 3, 4). 
The ventral side is flat, and the mesial part forms 
a narrow unoccupied stripe (fig. 3), twisting, slightly, 
along the whole of the rachis, so that, it presents an 
