meget sterke. Udenpaa Ringmuskellaget er Peritoneal- 
beklædningen bunden ved Bindevæv. 
Spiserørets og Tarmens Vægge ere noget forskjellige 
fra Svælgets. Epithellaget, der beklæder den indre Flade, 
er temmelig bredt og dannes af meget lange Cylinderceller, 
hvis bredere Del vender mod Tarmhulbeden. Mangfoldige 
af disse Cylinderceller vare fyldte med en finkornet, gul- 
agtig Protoplasmamasse, og adskilte sig fra de andre, der 
vare ganske vandklare og havde et mere grovkornet Ind- 
hold. Om disse gulagtige Cylinderceller fungere som Kjert- 
ler, der afsondrede den store Mængde Slim, som sammen- 
kittete Tarmindboldet, skulle vi ikke afgjøre med nogen 
Bestemthed, ihvorvel det forekommer os sandsynligt. Dette. 
Slim var altid i størst Mængde tilstede i den egentlige 
Tarm, hvor den paa enkelte Exemplarer dannede ligesom 
et membranøst Overtrek, der formentlig var dannet af det 
i Alcohol coagulerede Slim. 
I det omtalte membranøse Overtræk saaes en stor 
Mængde yderst fine, lange Folder, der havde en saa skuf- 
fende Lighed med lange Haar eller Cilier, at vi i Begyn- 
delsen antoge dem derfor, en Antagelse, der tilsyneladende 
var begrundet i den Omstændighed. at Prof. Ehlers i sit 
Arbeide over Slægten Priapulus* beskriver netop en Chitin- 
hud paa Tarmfladen, hvorfra mange fine, stive Haar udgaa. 
Epithellaget, der paa sin indre Flade synes at være 
forsynet med Cilier, er fæstet til- et stærkt Bindevævslag, 
Fig. 10, b, der sender listeformige Forlengelser ind 1 Epi- 
thelet og danner derved de paa den mdre Væg af saavel 
Spiserøret som Tarmen fremragende Folder, Fig. 10, c. 
Disse Bindeveyslister ere rigere paa Bindevævslegemer, end 
det øvrige Bindevæv. Udenpaa Bindevevet er nu Muskel- 
huden med sine to bestemte Lag, nemlig Længde- og Ring- 
muskler, hvilke sidste ere bundne til Peritonealovertrækket 
ved et smalt Bindeværvslag. 
Centralnervestrængen løber langs Midten af Bugfladen, 
Fig. 1, a, ikke som hos Gephyreerne ialmindelighed paa 
dennes indre Flade; men i Hudens Bindevæv, imellem Mu- 
skel- og Epithellaget. Fig. 3, k. Hvor Nervestammen lig- 
ger, er det fibrillære Bindevæv stærkt udvidet og omgiver 
den paa en beskyttende Maade, Fig. 3, c. 
Centralnervestrængen er indesluttet.i en tyk Binde- 
veevsskede, Fig. 3, 7, der sender en Forlængelse fra den 
ene Væg til den anden, tvers igjennem Nervestammen, Fig. 
3, m. Denne bliver derved delt i to Dele, hvoraf den 
indre er bredest, Fig. 3, n, og har en lidt mørkere Farve. 
Saavel fra denne Skilleveee, som fra Skedens indre Flade 
1 E. Ehlers. Ueber die Gattung Priapulus. Zeitschrift f. wiss. 
Zoologie. 11 Band, pag. 205. 
Den norske Nordhavsexpedition. Danielssen og Koren: Gephyrea. 
muscular integument, which consists of longitudinal and 
annular muscles, exceedingly strong. The peritoneal tunic 
is webbed on to the layer of annular muscles by connec- 
tive tissue. 
The walls of the esophagus and the intestine differ 
slightly from those of the gullet. The epithelial layer invest- 
ing the inner surface is comparatively broad, and consists 
of exceedingly long cylindric cells, with the broader por- 
tion facing the intestinal cayity. Many of these cylindric 
cells were full of a finely granulous, yellowish protoplas- 
matic mass, and differed from the others, which 
fectly hyaline, and contained a more coarsely granulous 
substance. Whether these yellowish cylindric cells serve 
the purpose of glands, whose function is to secrete the 
abundant supply of mucus that glues together the con- 
tents of the mtestine, we shall not venture to decide, though 
such, we conceive, is highly probable. Most of this mucus. 
was met with in the intestine itself, where, in some of the 
specimens, it actually formed a kind of membranous tunic, 
the mucus having probably been coagulated by the action 
of the alcohol. 
In this membranous tunic were seen’a great number 
of long and exceedingly narrow folds, presenting so illusive 
were per- 
a resemblance to long capillaments, or cilia, that at first 
we regarded them as such; and more especially, since Pro- 
fessor Ehlers, in his Memoir on the genus Priapulus,! de- 
scribes such a chitmous membrane on the surface of the intest- 
ine, from which proceed numerous stiff, slender capillaments. 
The epithelial layer, which would appear to be fur- 
nished on its inner surface with vibratile cilia, is webbed 
to a layer of strong connective tissue, fig. 10, b, from which 
cornice-like prolations of connective tissue are produced into 
the epithelium, thus occasioning the prominent folds, fig. 10, 
c, on the inner wall of both the cesophagus and the intest- 
ine. These cornice-like prolations are more abundantly 
furnished with corpuscles of connective tissue than any 
other part of the connective membrane. Next aboye the 
connective tissue. comes the muscular integument, with its 
two layers of longitudinal and annular muscles, the latter 
webbed to the peritoneal tunic by a narrow layer of con- 
nective tissue. 
The central nervous chord protends along the middle 
of the belly, fig. 1,@, not on the inner surface, as in most 
of the Gephyrea, but in the connective tissue of the skin, 
between the muscular and epithelial layers, fig. 3, k. Round 
the nervous trunk, the fibrillous connective tissue, which 
invests it with a protective covering, fig. 3, c, is greatly 
distended. 
The central nervous chord is enclosed in a thick 
membranous sheath, fig. 3, 7, which sends a filament from 
one wall to the other, piercing the nervous trunk, fig. 3, m. 
Hence the latter is divided into two sections, the inner, of 
a darker colour, being the broader, fig. 3, n. Both from 
this partition-wall and from the inner surface of the sheath, 
1 EF. Ehlers. 
11 Band, pag. 205. 
Ueber die Gattung Priapulus. Zeitschrift f. wiss. 
Zoologie. 
