langt, som Gastralfilamenterne naa, nemlig mdtil 207” ned 
i Rachis, der udgjør egentlig Bunden af Polypens Mave- 
hulhed. Alle 8 Gastralfilamenter ere optagne af Kjønsor- 
ganerne; men paa de to dorsale begynde de et længere 
Stykke nede end paa de øvrige 6. De ere i saadan Rig- 
dom tilstede, at de hos mange Polyper ganske udfylde 
Gastralhulheden. Denne bliver ned imod Bunden alt sma- 
lere og smalere og ender i en trang Kanal, der gaar over 
i det transverselle Kanalsystem. 
Paa enhver Polypstok ere samtlige Polyper af samme 
Kjøn; af de 6 Exemplarer, hvor Kjønsorganerne vare ud- 
viklede, var der 4 Hunner og 2 Hanner. Disse sidste 
havde intet Særpræg, ifølge hvilket man af det Ydre 
skulde være istand til at skjelne dem fra Hunnerne; men 
naar man undersøgte Generationsorganerne, saa vare disse 
hos Hannen melkehvide, imedens de hos Hunnen havde en 
rødlig Farve. 
Umbellulaens Ydre 
omtalt løseligt de ganske eiendommelige Zooider, som findes 
overalt paa Stokken, naar undtages den nederste Del af 
Vi have i vor Beskrivelse af 
det bulbøse Parti; vi skulle nu gaa noget nærmere ind 
paa dem. 
Den noget aflange Zooidekrop med den lange Tentakel, 
Fig. 56, a, er udvendigt beklædt med et Epithellag, der paa 
Kroppen er temmelig tykt, bestaaende af flere Lag Celler, 
imedens det paa Tentakelen og dens Pinnuler er noget 
tyndere, ligesom Cellelagene her ere færre. Cellerne ere 
polyædriske og fuldkommen lig dem, som findes paa Stok- 
coenenchymets ydre Flade, Fig. 57, a. 
Imellem Eetodermeellerne og nedsænket i dem sees en 
Mengde af de encellede Slimkjertler med deres Kjerne og 
Udførselsgang, Fig. 57, b. 58. 59. 60, b. Paa et Tvyersnit 
vise disse Kjertler sig som en smuk, lysende Perlekrands, 
XS, @ Dy Go OO) 
Fig. 58. 60; men seet fra Overfladen vise de sig som store 
Fordybninger i Epithellaget, Fig. 59, ligesom de uden at 
være præparerede med Jodgrønt synes at være ganske 
tomme. Selv efter Farvningen synes mange af dem at 
være kjerneløse, og det har forekommet os, at mange ogsaa 
vare aldeles uden Indhold. Indenfor Ectodermet er et 
smalt, hyalint Bindevæv, Fig. 58,c. 60, c,i hvilket sees fine 
Ernæringskanaler, og hvortil Muskellaget, der bestaar af 
sparsomme, eireulære Muskelfibre, fæster sig, Fig. 58, d, og 
meget stærke Længdemuskler, Fig. 58, e. 60, d. Muskel- 
laget er forsynet med Fpithelovertræk, dannet af flere Lag 
runde Celler, ganske lig dem, som tidligere ere beskrevne 
paa Polypkroppens indre Væg, Fig. 58, f. Fra Zooide- 
kroppens indre Flade udgaa 8 Septa, der fæste sig paa 
Svælget, Fig. 60, e, og danne derved de for Zooiden som 
for Polypen almindelige 8 Kamre.  Septa dannes ligesom 
hos Polypen af en Bindevævslamel, paa hvis ene Side 
ere transverselle Muskler, Fig. 60, f, og paa den anden 
longitudinelle, Fig. 60, g; disse Muskler ere beklædte 
med lignende Epithel som det, der beklæder Polypens indre 
Kropsvæg. Anordningen af Musklerne er den samme som 
tidligere omtalt hos Polypen. Hos Zooiden er der ogsaa 
en lateral, symetrisk Retning saaledes, at i Dorsalkammeret, 
which extend themselves as far as the gastral filaments 
reach, or, about 20”" down the rachis; which forms, really, 
the bottom of the polyp’s ventral cavity. All of the 
8 gastral filaments are occupied by sexual organs, but, 
upon the 2 dorsal ones, they begin a little lower down 
than on the other 6. They are present in such abundance, 
that in many polyps they quite fill up the gastral cavity. 
This becomes narrower and narrower towards the bottom, 
and terminates in a narrow canal which passes over into 
the transversal ductiferous system. 
On each polyp stalk, all it’s polyps are of the same 
sex. In the 6 specimens in which the sexual organs were 
developed, 4 were females, and 2 were males. The latter 
had no distinguishing feature which enabled them by their 
exterior appearance, to be distinguished from the females, 
but, when the generative organs were examined, these were 
found to be milk white in the males, whilst, in the females, 
they had a reddish colour. 
In our description of the Umbellula’s exterior, we 
have loosely referred to the quite peculiar zooids which 
are, everywhere, found on the stalk, with exception of the 
inferior part of the bulbous portion, and we shall now 
refer to them more particularly. 
The somewhat oblong zooidal body, with the long 
tentacle (fig. 
epithelium, which is rather thick upon the body, and con- 
56, a), is, exteriorly, covered with a layer of 
sists of several cellular layers; whilst, in the tentacle and 
it’s pinnulæ, it is somewhat thinner, whilst, also, the cellular 
layers are here, less numerous. The cells jare polyhedrous, 
and, exactly, like those found on the outer surface of the 
sarcosoma of the stalk (figs. 57, a, 58, a, 59, a, 60). Be- 
tween the ectoderm cells, and depressed in them, a multi- 
tude of the single-celled mucous glands, with their nuclei 
and excretory ducts are seen (figs. 57, b, 58, 59, 60,0). 
Å sectional aspect shows these glands, like a beautiful, 
brilliant, pearl wreath (figs. 58, 60); but, viewed from the 
surface, they appear, as large depressions in the epithe- 
lium layer (fig. 59), whilst also, until treated with Iodine 
green they appear to be quite empty. Even, after being 
coloured, many of them appear to be without nucleus, and 
it has appeared to us, that many of them have, really, been 
without contents. Inside of the ectoderm, there is a nar- 
row, hyaloid connective-tissue (figs. 58, c, 60, c) in which, 
minute nutrient ducts are seen, and to which the muscular 
layer is attached. This layer consists, of sparse, circular, 
muscular fibres (fig. 58, d) and very strong longitudinal 
muscles (figs. 58, e, 60, d). The muscular layer is fur- 
nished with epithelium covering, formed of several layers of 
round cells quite similar to those which have been previ- 
ously described as pertaining to the inner wall of the body of 
the polyps (tig. 58, f). From the inner surface of the body 
of the zooids, 8 septaissue; these attach themselves to the 
gullet (fig. 60, e), and form, thus, for the zooid as well as 
for the polyp, the 8 usual chambers. Septa are formed, 
as in the case of the polyp, by a connective-tissue lamella, 
on one of whose sides there are transversal muscles (fig. 
60. f) whilst, on the other side, there are longitudinal muscles 
a RR gr TT 
