have nogen Lighed med Føddernes Kalkspikler, men ere 
dog lidt forskjellige fra disse i Form, ligesom de ere noget 
mindre. Som oftest ere Tentaklernes Spikler forgrenede 
snart i den ene, snart i begge Ender, og synes at være 
rigere paa Takker, Fig. 11. Ogsaa i denne Dels indre 
Bindevævslag træffer man paa de elliptiske Kalklegemer, 
forøvrigt er den histologiske Bygning den samme, som 1 
Skaftet. Tentaklerne kunne indtrækkes til den bredere Del, 
altsaa kun Skaftet kan trækkes ind i Legemet og Tentake- 
len ,paa den Maade forkortes; men ligesom Tilfældet, er 
med Fødderne, saaledes ogsaa med Tentaklerne; den rige 
- Spikelbeklædning lægger Hindringer iveien for, at de ganske 
kunne skjules i Kropshulheden. 
Fordøielsesorganerne tage sin Begyndelse ved Mund- 
aabningen, hvor Indgangen til Svælget (Atriet) er temmelig 
vid og foldet, meget muskuløs, og bidrager til at danne den 
stærke Sphincter omkring Munden. Svælget er meget sne- 
vert, temmelig langt, Fig. 3, b, og bundet til Kalkringen 
ved en Mængde muskuløse Traade, ligesom der fra dets 
ydre Flade afgaa mange fine Bindeveeystraade til Mundski- 
vens bagerste Flade. Det er beklædt af det flimrende 
Peritoneum, indenfor hvilket findes et tyndt Bindevæv, 
Umiddelbart paa dette 
hvile Længdemusklerne; saavel Ring- som Længdemusklerne 
synes ikke at være adskilte i Bundter; men Fibrene løbe 
parallel med hverandre, saa det faar Udseende af at være 
en sammenhængende Hud. Indenfor Længdemusklerne er 
atter et Bindevævslag, hvori sees en rig Karudbredning. 
Til dette Bindevævslag fæster sig et tykt Lag af Oylmder- 
epithel, der bidrager, til at danne de stærkt fremspringende 
Længdefolder, hvormed Svælgets indre Flade er forsynet. 
hvortil Ringmuskellaget er bundet. 
Lidt bagenfor Vandkarringen gaar Svælget over i 
Mayen, der danner en aflang sækformig Udvidning, som er 
temmelig muskuløs; men hvis Vægge dog ikke ere saa 
tykke, som Svælgets, Fig. 3, c. Paa Mavens indre Flade 
findes ligeledes en Mængde Folder, der rage ind i Hulhe- 
den. Saavel Svælget som Maven havde en jævn brunlig- 
rød Farve og vare tomme. Hvor Maven gaar over i Tar- 
men er en Indsnøring. ‘armen dreier sig strax mod Venstre, 
hvor den gjør en Bøining, gaar saa næsten horizontalt langs 
Bugfladen bagover til den bagerste Trediedel af Kropshul- 
lreden, Fig. 3, d; her bøier den sig atter, gaar nu forover 
og skraat over til høire Side, næsten 1 Niveau med første 
Slynge, Fig. 3, e, og sender nogle Bindevævsbaand over til 
Mayen, Fig. 3, f; herfra gjør den en Bøming, idet den 
gaar paany bagover noget paa skraa, Fig. 3, g, indtil den 
ved Begyndelsen af Kropshulhedens bagerste Trediedel dan- 
ner et Knæ for i Midten af Hulheden at gaa horizontalt 
bag mod Anus, Fig. 3, h. Paa denne horizontale Del, der 
maa ansees for Rectum, er en temmelig tydelig Udvidning, 
24 
lobes, is furnished in great abundance with calcareous spi- 
cule. Here, being as it were braided together, they as- 
sume the appearance of an elegant armature, presenting in 
other respects some resemblance to those in the suckers, 
though slightly different in form, and smaller. The greater 
part of the tentacular spicule are branched, some at one 
extremity, others at both; their dentelli, too, are appa- 
rently more numerous, fig. 11. In this part also occur the 
elliptic calcareous corpuscles, distributed through the inner 
layer of connective tissue; the histological structure is in 
other respects similar to that of the shaft. The tentacles 
can be retracted up to their broader part, that is to say, 
the shaft alone admits of being withdrawn. into the body, 
and to that extent accordingly they are contractile; but, as 
with the suckers, so with the tentacles, the spicular surface 
of, the integument prevents their being wholly concealed in 
the perivisceral cavity. 
The digestive organs originate at the oral aperture, 
or rather at the entrance to the gullet (the atrium), 
which is rather wide and folded, and exceedingly muscular, 
contributing to the formation of the powerful sphincter sur- 
rounding the mouth. The gullet is remarkably narrow, 
rather long, fig. 3.0, and webbed to the calcareous ring by 
a number of muscular filaments; from its outer surface, too, 
numerous slender filaments of connective tissue proceed to 
the posterior surface of the oral disk. It is covered by 
the ciliated peritoneum, beneath which extends a thin con- 
nective membrane, to which is webbed the layer of annular 
muscles. Above, and in direct contact with, the latter, are 
the longitudinal muscles; neither the annular nor the long- 
itudinal muscles would appear to be arranged in fascicles; 
but their fibres run parallel to one another, giving the ap- 
pearance of a continuous skin. Under the longitudinal muscles 
occurs another layer of connective tissue, in which is seen an 
extensive vascular arrangement. This layer of connective 
tissue is webbed to a thick layer of cylindric, cellular epi- 
thelium, which contributes to the formation of the abruptly pro- 
jecting longitudinal folds on the inner surface of the gullet, 
A little posterior to the water-vascular ring, the gullet 
opens into the stomach, an oblong sac, which is rather | 
muscular, but with somewhat thinner walls than those 
of the gullet, fig. 3, c On the inner surface of the 
stomach occur too a number of folds, projecting into the 
cavity. The gullet and the stomach, which are of a 
uniform brownish-red, were both empty. At the point 
where the stomach opens into the intestine is seen a 
constriction. The intestine immediately strikes off. to the 
left, and then makes a bend, proceeding backwards, and 
almost horizontally along the ventral surface, to the poste- 
rior third of the perivisceral cavity, fig. 3,d,; here it makes 
another bend, taking a forward and oblique course to the 
right, almost in a plane with the first convolution, fig. 3, e, 
a few ligaments of connective tissue now connecting it with 
the stomach, fig. 3, f; here it bends anew, and obliquely 
backwards, fig.3,g, continuing in that direction till, at the com- 
mencement of the posterior third of the perivisceral cavity, 
it forms a kind of knee, proceeding, when arrived at the ~ 
