spring med Epithelbekledningen dannede stærke paalangs 
gaaende Folder, som findes paa Npiserørets indre Flade. 
Epithelet bestaar af et Lag langstrakte Oylinder- 
celler, der slutte tæt til hverandre ved Grunden, hvor 
de ere festede til Bindevævet. Disse Cylinderceller have 
en bred Basis og lobe noget tilspidsede henimod Cuticula. 
Enkelte af dem ere bredere og større end de andre og 
kunne svare til de Geller, Dr. Teuscher har anseet for 
Kjertler hos Holothuria tubulosa. Hvor Spiserøret gaar over 
i Mavesækken er en næsten umærkelig Indsnøring. 
Maven er lidt kolbeformig, Tab. I, Fig. 8, a, om- 
trent 2,57” lang, bredere fortil, smalere bagtil, hvor den 
gaar over i Tarmen. Den har en intens rødviolet Far- 
ve, er meget muskuløs, og synes i denne Henseende at: 
overgaa Svælget. Dens indre Flade er foldet, men det er 
især paa den ventrale Del, at Folderne ere betydelig frem- 
ragende, og her er Hpithellaget ogsaa tykkere, imedens Cu-' 
ticula er smalere, end Tilfældet er i Svælget. Fpithelet 
bestaar her af lignende Celler, som de, der ere beskrevne 
for (Ksophagus, kun ere de især paa Ventralfladen noget 
længere, og have en smuk rød Farve, der hidrører fra deres » 
pigmenterte Indhold. Om disse pigmenterte Celler, for- 
nemmelig de store, fungere som Kjertler, skulle vi lade 
staa derhen, usandsynligt er det dog ikke; thi de ere jo 
noget forskjellige fra de øvrige Epithelceller. Idet Mayen 
gaar over i Tarmen, er der en liden Indsngring af denne, 
Fig. 8, b, som strax derpaa udvider sig og bliver tem- 
melig .tyk. | 
Tarmen har, som sædvanligt hos Holothuriderne, tre 
Bøjninger. Den første, nedadstigende Del, Fig. 8, c, ligger 
imellem begge Ryggens Længdemuskler, og gaar bag til 
Kloaken, derpaa slynger Tarmen sig til Venstre, gaar for- 
til og ligger nu i venstre Mellemrum paa Triviet, indtil 
den naar Maven, Fig. 8, d, hvor den højer sig over til 
højre Side, og løber saa bagtil i højre Trivium for at munde 
ud i Kloaken, Fig. 8, e. Tarmens Vægge ere tyndere end 
Mavens, kun henimod Kloaken antage de en tykkere Ka- 
rakter, idet Muskelhuden. har en rigere Muskulatur. Binde- 
‘veevet er det samme hyaline, som tidligere omtalt, og paa 
Tarmens indre Ventralflade iagttages temmelig tætstaaende 
Længdefolder, der rage noget ind i Lumenet og ere egent- 
lig Fortsættelser af Mavens Længdefolder. Den udvendige 
Flade har som sædvanligt et flimrende Peritonealovertræk. 
Tarmkanalen er langs Bugfladen bunden til denne ved 
Mesenteriet, der bestaar væsentlig af Bindevævstraade, hvori 
enkelte Muskelfibre fimdes; men foruden dette Mesenterium 
er der ogsaa nogle meget lange muskuløse Traade, hvoraf 
_riorly at the entrance to the intestinal canal. 
| from their pigmentary contents. 
* developed. 
with a thick cuticle. The cornice-like processes form with 
"the epithelial integument the prominent longitudinal folds 
that occur on the interior surface of the cesophagus. 
The epithelium consists of åa layer of elongate, cylin- 
dric cells, continuous at their bases, which are attached 
to the connective tissue. . These cylindric cells have the 
base broad, becoming slightly acuminate towards the cu- 
ticle. Some of them are broader and larger than others, 
and correspond, it would seem, with the cells in Holothuria 
tubulosa, supposed by Dr. Teuscher to be glands. ° At the 
point where the cesophagus opens anto the ventricle, occurs 
a scarcely appreciable instriction. 
The stomach is slightly clavate, Pl. I, fig. 8, a; it meas- 
ures 2.57” in length, and is broader anteriorly than poste- 
In colour it is 
deep violet, with a vivid tinge of red. The stomach has very 
considerable muscular development, surpassing apparently 
in this respect the pharynx. Disposed over the inner 
surface, occur a’ series of folds, of which those on tlie ven- 
tral portion more especially ate very prominent; and here, 
too, the epithelium is thicker, whereas the cuticle exhibits 
greater tenuity than is the case in the skin of the gullet. 
The epithelium consists here of cells similar to those — 
described above — in the'æsophageal integument; they are, 
however, in particular on the ventral surface, somewhat 
greater in length, and of a fine bright-red colour, arising 
Whether these pigmentary 
cells, more especially the large ones, perform the function 
of glands, is a question we shall not attempt to decide; 
improbable, however, it certainly is not, differing as they do 
in some respects from the other epithelial cells. At the 
pyloric, or intestinal, opening, the stomach is slightly con- 
stricted, fig. 8, b; it immediately however expands, the 
walls attaining considerable thickness. Re 
The intestine is triply convolute, a normal feature in 
the Holothuriide. The first, descending portion, fig. 8, ¢, 
extends down between the two dorsal longitudinal muscles, 
passing backwards to the anal aperture; the intestine then 
deflects sinistrously, protends forwards, and occupies the 
left segment’ of the trivium, till it reaches the stomach, fig. 
8, d, where, after making a dextral bend, it projects back- 
wards into the right segment of the trivium, to disembogue 
into the cloacum, fig. 8. e. The walls of the intestine are 
thinner than those of the stomach; not till they. approach 
the anal opening is greater compactness apparent, the 
muscles in that part of the integument being more highly 
The connective tissue is the hyaline membrane 
previously described. On the inner ventral surface of 
the intestine occur a number ,of rather closely disposed 
longitudinal folds, slightly projecting into the lumen — 
prolations from the longitudinal folds of the stomach. Over 
the outer surface extends the normal peritoneal membrane, 
furnished with vibratile cilia. . 
The intestinal canal is webbed to, and along, the 
ventral surface by the mesentery, which consists chiefly of 
filaments of connective tissue, along with a few muscular 
fibres; but, exclusive of this mesentery, there are a few ex- 
