gelen ligge de paa hinanden og danne tildels større eller 
mindre Bundter. 
Polyperne ere cylindriske, vandklare, saa at man 
gjennem Kroppen kan se Skillevæggene; de ere imellem 
3—4”” lange. Tentaklerne ere fjederformede, mindst dob- 
belt saa lange som Kroppen, og paa den aborale Flade 
forsynede med en Midtrække af vandklare, trekantede, 1 
begge Ender noget tilspidsede Spikler, der ere 0,196”” lange, 
Q,0147” brede og gaa fra Tentakelens Grund til 
Spids. 
dens 
Mundskiven er lidt hvælvet, og 1 dens Midte sees den 
aflange Mundaabning, der fører ind til det lange, paa sin 
indyendige Flade stærkt foldede Svælg. Fra dettes nederste 
fri, runde og noget tykke Rand udgaa 8 Gastralfilamenter, 
hvorat to ere længere end de øvrige. Langt nede i Ga- 
stralhulheden udvikle Generationsorganerne sig paa Septula ; 
de danne stilkede Kapsler, hvori hos Hunnen udvikler sig 
i Regelen kun 1 Æg. Protoptileslegten har efter alt at 
dømme særskilt Kjøn, idetmindste forholder det sig saa 
hos de Arter, vi have havt Anledning til at undersøge og 
beskrive. 
Zooiderne adskille sig ikke fra dem, der findes hos 
Protopt. lofotense, naar undtages, at Munden er aflang, 
imedens den hos Protopt. lofotense viste sig at være rund, 
hvilket forresten kan være Følgen af en stærkere sammen- 
trukken Tilstand. De ere ligesom hos Protopt. lofotense 
omgivne krandsformigt af trekantede Spikler, der ere noget 
afstumpede i den nederste Ende, imedens den øverste er 
meget tilspidset; de største ere 0,536”” lange, 0,054"m 
brede. 
Sarcosomaet er temmelig tyndt, og i det ydre Binde- 
væv er sammenpakket en Mængde vandklare, trekantede 
Spikler lig dem, som findes i Cellerne, og som med Hensyn 
til Form ikke afvige fra dem, der ere afbildede paa PI. 1, 
Fig. 17; men i den før beskrevne Kjøl langs Ventralfladens 
Midte findes ikke Kalkspikler, hvilket er Tilfseldet hos de 
to foregaaende Arter. 
Farven. 
Rachis 
pernes Krop 
er bleggul; Cellerne ere næsten hvide; Poly- 
vandklar; Tentaklerne som Cellerne. 
Findested. 
Station 255 
Artskarakter. 
Rachis 215”” lang. —Dorsalsiden hvælvet med en 
smal, dyb Midtfure; paa hver Side af denne Cellerekker, 
der staa langt fra hinanden og gaa paaskraas opad fra Dor- 
sal- mod Ventralsiden. I hver Række 3 Celler, som 
, 
ere 
67 
at the inferior extremity of the cell, in the form of a 
truncated cone; whilst, superiorly, they pass over in a pyra- 
midal form into the teeth. They are, as a rule, placed upon 
each other, and form, partly, larger or smaller bundles. 
The polyps are cylindrical, and clear as water, so 
that, the dividing walls become visible through the body; 
and, they measure between 3—4”” in length. The ten- 
tacles are feather-shaped, and are at least twice as long as 
the body. On the aboral surface, they are furnished with 
a mesial series of spicules, which are clear as water, 
triangular in shape, and acuminated at both extremities. 
They measure 0.1367" long, 0.014””" broad, and extend 
from the base of the tentacle to its point. 
The oral disk is a little arched, and 
oblong oral aperture which leads into the (on its 
From the 
in its middle, 
the 
interior surface strongly folded) gullet, is seen. | 
inferior, free, round, and somewhat thick margin of the 
gullet, 8 gastral filaments proceed, of which, two are longer 
than the others. Far down in the gastral cavity, the 
generative organs develope themselves on the septula. They 
form pedunculated capsules, in which, in the case of the 
The 
Protoptilum genus has to all appearance, separated sexes; at 
all events, this has been the case with the species which we 
female, there is, usually, only one ovum developed. 
have had an opportunity of examining and describing. 
The zooids do not differ from those which are found 
in Protopt. lofotense, with the exception that, the oral 
aperture is oblong, whilst, im Protopt. lofotense, this was 
shown to be round; but that, however, may be the con- 
sequence of a more strongly contracted condition. Like 
those of Protopt. lofotense, they are surrounded in wreath 
form, by triangular spicules, which are somewhat blunted 
at the inferior extremity, whilst, the superior extremity is 
very acuminate. The largest of these zooids measures, 
0.5386”" long, and 0.0547” broad. 
The sarcosoma is rather thin, and in the external 
connective-tissue there is, compactly crowded, a multitude of 
triangular spicules, clear as water, like those found in 
the cells; these, in regard to form, do not differ from 
those which are illustrated in PI. II, fig. 17; but, im the 
keel already deseribed as situated along the mesial line of 
the ventral surface, no spicules are found, whilst, the case 
is the opposite m the preceding species. 
Colour. 
The rachis is pale-yellow. The cells are nearly white. 
The body of the polyps is as clear as water. The tentacles 
are like the cells in colour. 
Habitat, 
Station No. 255. 
Specific character. 
The rachis is 215”” long. The dorsal side is arched, 
and has a narrow, deep, mesial furrow; on each side 
of this furrow, there are series of cells, placed far apart 
from each other, and extending, diagonally, from the dorsal, 
9% 
