Mundskiven og Tentaklerne have samme histologiske 
Bygning som Kroppen. Omkring Munden samle Kroppens 
transverselle Muskelfibre sig og danne en Slags Slutte- 
muskel; forøvrigt er Muskellagene saavel i Mundskiven som 
1 Tentaklerne Fortsættelse af Kroppens. 
Svælget er meget langstrakt; hos en Polyp, hvis Krop 
var 447” lang, var det 23”” langt; det er cylindrisk, meget 
stærkt foldet paatvers, Fig. 45, a, og afdelt i 8 Felter ved 
de 8 Septa, som fæste sig paa det, Fig. 45, b. 47, a. Dets 
udvendige Flade er beklædt med et Epithel, der bestaar af 
flere Lag’ runde Celler, som have en tynd, klar Membran, 
en temmelig stor, excentrisk Kjerne, omgiven af Proto- 
plasmakorn. Cellerne ere 0,011”” og Kjernen 0,002””, 
fuldkommen lig dem, som findes paa Polypkroppens indre 
Veg, Fig. 43, b. 46, a. 50, e. Imellem disse Entoderm- 
celler sees hist og her lignende runde Celler, men hvori 
findes intens brune Pigmentkorn, Fig. 46, b. 50, f. Inden- 
for Fpithellaget er et temmelig smalt, fibrillært Binde- 
vævslag, Fig. 43, c. 51,0, hvori sees dels Bindevævslegemer, 
dels en Mængde fine Saftkanaler, der ere forsynede med 
Kpithel, hvis lidt aflange Celler ganske udfylde Lumenet. 
Fra dette Bindevæv udsendes pyramideformigt tilspidsede 
Forlængelser, der danne Grundlaget for Svælgets Folder, 
Fig. 43,d.51,c. Paa disse Bindevævspyramider ere Længde- 
musklerne fæstede, Fig. 43,e. 51, d, imederis Tvermusklerne 
vise sig langs deres Grunddel, Fig. 51, e. Hele Svælgets 
indre Væg, der er stærkt foldet paatvers og farvet mørke- 
brunt, har et Bpithelovertræk, der er fæstet til Muskellaget, 
og som omtrent iden øverste Halvdel bestaar af polyædriske 
Celler, der have et mørkt, kastaniebrunt Pigmentindhold 
og ere lig dem, som ere beskrevne paa Kroppens ydre 
Flade. Imellem disse Celler sees hist og her aflange, næsten 
klare Celler med en stor, aflang Kjerne og et klart kornet 
Indbold, hvilke minde om de encellede Slimkjertler paa 
Polypkroppens og Stokeoenenchymets ydre Flade. I Svæl- 
gets nederste Halvdel optræder et noget forskjelligt Epithel- 
lag, som nærmer sig temmelig meget til det, der beklæder 
dets ydre Væg og Kammervæggene. Det bestaar af runde 
Celler, 0,008”” store, som have en tynd, gjennemsigtig Mem- 
bran, en rund, noget excentrisk Kjerne, 0,002”” og et fin- 
kornet Indhold, hvori findes mange, temmelig intens mørke- 
brune Pigmentkorn, Fig. 48, a. Imellem disse Celler sees 
andre, lidt aflange Celler, der ere aldeles klare, have en 
rund Kjerne, omgiven af en yderst finkornet Masse og ere 
sandsynligvis encellede Slimkjertler, Fig. 48, 0, og endelig 
iagttages overalt i Svælgets Fpithel lange, gjennemsigtige, 
brunlige Legemer, i hvis Midte løber paalangs en spiral- 
formig Traad (Nematoeyster), Fig. 51,f. Imellem Folderne 
paa Svælget saaes Rester af Molusklarver, Crustacelarver, 
Behinodermlarver, samt en hel Del Diatomeer, Alt Nærings- 
_ stoffe, der vare vel indhyllede i en rig Slimmasse. 
Den norske Nordhavsexpedition. Danielssen og Koren. Pennatulida. 
The oral disk, and the tentacles, have the same histo- 
logical structure as the body. The transversal muscular 
fibres of the body collect around the oral aperture, and 
form a kind of sphincter. The layers of muscles are, 
otherwise, both in the oral disk and the tentacles, a con- 
tinuation of those of the body. 
The gullet is very elongated. In one polyp whose 
body measured 44”” long, the gullet was 237” long. It is 
cylindrical; very much folded transversally (fig. 45, a), and 
is divided into 8 divisions, by 
to it (figs. 45, b, 47, a). covered 
with an epithelium, consisting of several layers of round 
cells, with a thin clear membrane, and containing, a rather 
the 8 septa which adhere 
It’s exterior surface is 
large eccentric nucleus surrounded by protoplasmic granules. 
The cells are 0,011” wide, and the nucleus is 0,002”” 
broad, and exactly like those which are found on the 
inner wall of the body of the polyp (figs. 43, b, 46, a, 50, e). 
Between these entoderm cells, there are seen, here and 
there, similar round cells, but, in which, deep brown-ting- 
ed granules are found (figs. 46, b, 50, f). Inside of the 
layer of epithelium, there is a rather narrow layer of 
fibrillous eonnective-tissue (figs. 43, c, 51, b), m which is 
seen, partly, connective tissue corpuscles, and, partly, a 
multitude of minute secretory ducts; these are furnished 
with epithelium, whose slightly oblong cells quite fill out 
the channel. From this connective-tissue, pyramidal 
acuminated prolongations issue, and these form the found- 
ation of the gullet folds (figs. 43, d, 51, c). The longi- 
tudinal muscles are adherent to these connective-tissue 
pyramids (figs. 43, e, 51, d), whilst, the transversal muscles 
appear along their basal part (fig. 51, e). 
of the whole 
The inner wall 
of the gullet is much folded, transversely, 
and is coloured dark brown. It has an epithelium covering, 
which is secured to the muscular layer, and which, for 
about it’s superior half portion, consists of polyhedrous cells, 
having a dark, chestnut brown coloured contents, and, which 
are like those which have been described as pertaining to the 
body’s exterior surface. Between these cells, there are here 
and there seen, oblong, almost clear cells, with a large 
oblong nucleus and a clear granular contents, which recall 
to mind the single-celled mucous glands on the body of 
the polyp and the exterior surface of the sarcosoma. In 
the gullet’s inferior half part, a somewhat different layer 
of epithelium appears, and this approaches, pretty much, in 
similarity, to that, covering it’s outer wall, and the chamber 
It consists of round cells, 0,008" wide, with a thin, 
transparent membrane, which contain a round, somewhat 
eccentric nucleus 0,002”” broad, and a minute granular 
walls. 
contents, in which is seen, many rather deep-brown coloured 
granules (fig. 48, a). Between these cells, other, somewhat 
oblong cells, are seen; these are perfectly clear, and 
nucleus 
minute-grained substance, and are, presumably, single-celled 
mucous glands (fig. 48, b); and finally, in the epithelium 
of the gullet, there is, everywhere, observed, long, brownish 
translucent bodies, in whose middle there runs, longitud- 
inally, a spiral formed filament (nematocyst) (fig. 51, f). 
contain a round surrounded by an extremely 
( 
