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88
Tab. V, Fig. 6. Kalkringen med Vandkarsystemet, og et
Hudparti, forstørret, a Kalkring-, b, b
de to Processer paa de to dorsale
Radialstykker; c den Poliske Blære ; d
Vandkarringen; e Længdemuskel.
— 7. Stenkanalen af samme Dyr, forstørret.
a Ligamentet, der fæster Stenkanalens
ydre Ende til Huden ; b Madreporpladen
med sin ujevne, takkede Overflade; c den
egentlige Kanal; d den bredere Del.
hvorved den udmunder i Vandkarringen.
— 9. Tversnit af Huden af den bagerste Ende
af Acanthotrochus mirabilis, forstørret, a
Cuticula med deWerunder liggende
Epi-thellag; b Hyalint Bindevæv; c, c
Binde-vævslegemer; d Bindevævslegemer med
kornet Indhold (Sempers Slimceller); e, e
Encellede Slimkjertler; / Ringmuskler; l
Længdemuskel; g Nervekarret
sammenvoxet til Nervens indre Flade; h
Nervekarret, der er aabent til Nervens ydre
Flade; i Nervestammens lysere, bredere
Lag; k Nervestammens mørkere Parti,
der er sammenvoxet med Karret.
Tab. VI. Fig. 8. Acanthotrochus mirabilis i omtrent
naturlig Størrelse.
— 81. Den samme forstørret, i hvis gjennemsig-
tige Hud Kalkhjulene sees. ligesom
Tarmkanalen viser sig tydeligt.
— 10. Stilkløse Legemer, der rage frit i Krops-
hulheden ; a, a Spredte Epithelceller i
Peritonealovertrækket, forstørrede.
— 11. Lignende Legemer, men stilkede og blad-
formige, forstørrede.
— 12. Et Stykke Hud, hvori de forskjellige Hjul
ere leirede, forstørret, a, a De store
Hjuls Tænder.
— 13. Det store Hjul, stærkere forstørret, a, a
Vingeformige Radier ; b trekantet Rum
imellem to Radier; c Tand paa Hjulets
ydre Rand.
— 14.’Det mindre Hjul, stærkt forstørret, a
Vingeformige Radier; b Mellemrummet
for to Radier; c Tænder paa Hjulets
indre Rand.
— 15. Kalkringen, seet fraoven, forstørret, a
Længdefure; b, b de to Processer paa to
Radialstykker; c en Proces paa hvert af
de øvrige tre Radialstykker; d
Interradial-stykket paa Ryggens Midte; e
Halvmaaneformigt Indsnit.
— 16. Et Stykke af Kalkringen, seet fra Siden,
lidt stærkere forstørret, a Radialstykkets
Legeme; b dets Proces; c Længdefure;
PI. V, fig. 6. Calcareous ring, aquiferous system, and
part of the skin, magnified: a calcareous
ring; b, b the two processes on the two
dorsal radial segments; c vesicle of Poli;
d water-vascular ring; e longitudinal muscle.
— 7. Sand-canal in same animal, magnified: a
the ligament by which the outer extremity
of the sand-canal is attached to the skin;
b madreporic body with its rough indented
surface; c sand-canal: d the broad part
through which it opens into the
water-vascular ring.
— 9. Transverse section of the skin of the pos-
• terior extremity of Acanthotrochus mirabilis,
magnified: a cuticle with underlying
epithelial layer; b hyaline connective tissue;
c, c corpuscles of connective tissue; d
corpuscles of connective tissue with granulous
contents (Semper’s mucous cells); e, e
unicellular mucous glands; f annular muscles;
I longitudinal muscle; g nervous vessel
connate with inner surface of nerve; h
nervous vessel open towards outer surface
of nerve; i the broad, light-coloured layer
of the nervous stem; k the darker section
of the nervous stem, connate with the vessel.
Pl. VI. fig. "8. Acanthotrochus mirabilis, about the natural
size.
— 8’. Same animal magnified, showing the calcare-
ous wheels through the translucent skin;
the intestinal canal, too. is distinctly
perceptible.
— 10. Non-pedicellate corpuscles projecting freely
into the perivisceral cavity: a, a isolated
epithelial cells in the peritoneal tunic.
— 11. Similar corpuscles, but pedicellate and leaf-
shaped; magnified.
— 12. A piece of the skin in which the calcare-
ous wheels are embedded, magnified: a, a
teeth of the large wheels.
— 13. One of the large wheels more highly mag-
nified : a, a wing-shaped radii; b triangular
space between two of the radii; c teeth on
outer margin of wheel.
— 14. One of the small wheels highly magnified:
a wing-shaped radii; b space between two
of the radii; c teeth on inner margin of
wheel.
— 15. The calcareous ring, viewed from above,
magnified: a longitudinal furrow; b, b the
two processes on the two radial segments ;
c process on each of the three remaining
radial segments; d the interradial segment
on the middle of the back; e lunate incision.
— 16. Segment of the calcareous ring, lateral
aspect; more highly magnified: a corpus
of radial segment; b its process; c longi-
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