Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
CO
Samtlige Coiler, «navel de udviklede som uudviklede,
m rigelig forsynede med Kalkspikler. der have en tor
skjellig Størrelse. imedens den trekantede Fonn tilhører
dem alle. De ere Ira (J,lel til 0,440"" lange og fra
o.u18—0,032...... brede. Deres Ender ere hyppigst
afstumpede og enkeltvis forsynede med Takker. Disse Spikier
ere i niauge Lur saa sammenpakkede, at den tykke
Cellevæg har et Ldseonde, som om den er dannet af hare Kalk,
saa at det selv med kaustisk Kalilud hai- sine
Vanskeligheder at skille Spiklerue tilstrekkelig fra hverandre.
Polyperne ere cylindriske og sandsynligvis i-etraktile,
’i""’ lange, hvoraf Kroppen er :l...... lang. Paa Kroppen
iagttages H meget nphoiedc. piialangsgaaeude. lirede Ribber,
Fig. ti. li. der dannes af mange Lag tæt paa liinauden
liggende, trekantede Spikier, s..... ere afrundede paa
Enderne og tildels tinttakkede; ile ere fra 0,320-0,440""
lange og fra 0,020 0,028""’ lirede. Felterne imellem disse
Ribber. Fig. 9, c, el-e ligeledes optagne af lignende Spikier,
men hel- ligge de niere paatvers og ere mel-e spredte.
Tentaklerne have samme Længde som Kroppen og ere
forsynede med tykke, koniske Finnuler, Fig. il. Naar
undtages den midterste Del af den adorale Flade, er hele
Tentakelen ligesom indkapslet af Kalkspikler. Paa den
abornle Flade ei- en hoi. bred Ryg, sammensat af Spikier,
lig de største paa Kroppen; men til Siderne og paa
l’iii-nulerne ere Spiklorno ikke saa sammenpakkede, ligesom
de ere mindre og have tildels en lidt forskjellig Form.
De ere dels elliptiske, dels have de spidse, dels afstumpede,
tinttakkede Ender, ere fra 0,150—0,200"" lange, og fra
0,008—0,012"" brede. Muiidskiveii er lidt hvælvet’og rig
paa Kalkspikler. lig dem i Polypkroppen. Svælget er
foldet paatvers, har en brun Farve, og i dets Hindevæv er
en Mlengde Spikier leirede, fuldkommen lig dem. som findes
paa Tentaklernes Piiniuler.
Ventralfladen er lidt fladtrykt, har en meget smal,
paalaugsgaaende Fure, Fig. 8, <•, fra hvis Rande
Oelleræk-kerne tage deres Begyndelse, »aar undtages dette yderst
smale, nøgne Belt,- paa Ventralfladen, er den øvrige Del
af Rachis besat med Polyper.
Under de ovenbeskrevne, udviklede Polyper sees en
rund Zooide, som er vel indpakket i Kalkspikler. Det or
sandsynligt, at der imellem Rækkerne af de udviklede
Polypceller tindes Zooider.
Stilken er ruml. smalner ganske lidt af ned imod
Enden, der danner en konisk Hulbus. Fig. 8. Stilkens
Sarcosoma er temmelig tyk og fast af Spikelafsætningor.
Spiklerue i Stilken ere forskjellige i Form og Størrelse.
Størstedelen er trekantet, noget fladtrykt med brede,
takkede Ender og Kanter. Fig. 10—14, de ere fra 0.1 50—0,180""
jange, fra 0,020—0,028"" brede; enkelte ere næsten gaffel-
Ali the cells, both, the fully developed as «ell as
the undeveloped, are abundantly furnished with calcareous
spicules, which have a variable size, although, the
triangular form is common to all of them. They measure
from 0.161"" to 0.440""" long, and from 0.018—0.032......
broad. Their extremities are. most frequently, blunted, and
are, occasionally, aculeated. These spicules are so
tightly-packed, in many layers, that the thick ivall of the cell obtains
the appearance of being composed of calcium alone, anil
even, when caustic potash iu solution is used, it is not
without difficulty, that the spicules can lie sufficiently
separated from oaeh other.
The polyps are cylindrical, and probably retractile.
They measure li’"" in length, of which, the body occupies
3" ’. On the body there’ is observable, 8 considerably
elevated, broad, longitudinal ribs (tig. U, i); these are formed
of many layers of triangular spicules placed close upon
each other, and which are rounded on the extremities, and
partly, minutely aculeated; tliev measure fro......320—0.440"""
long, and from 0.020—0.028""’ broad. The areas between
these ribs (tig. 9, c). are. also, occupied by similar spicules,
but here, they are situated more transversally. and are
more dispersed. The tentacles have the same length as
the body, and are furnished with thick conical pinnules
(flg. 0). With the exception of the mesial part of the
adoral surface, the entire tentacle is, as it were, enclosed
in a capsule of calcareous spicules. On the aboral surface,
there is. a high broad dorsum, composed of spicules
similar to the largest spicules ol’ the body, but. to the
sides, and Oll the pinnules, the spicules are not so much
packed together; whilst, also, they are smaller here, and
have, partly, a different form. They are, partly, elliptical,
and they have, partly, pointed, and partly, blunted, minutely
aculeated extremities; they measure fli.......... 0.200".....
long, and from 0.008—0.012"" broad. The oral disk is
slightly arched, and is rich in calcareous spicules lik.’ those
of the" body of the polyp. The gullet is folded transversally.
and has a brown colour; aud embedded iu its
eonnoctive-tissue, a mass of spicules is found, exactly similar to those
found Oll the pinnules of the tentacles.
The ventral surface is a little flattened, and has a
very narrow longitudinal furrow (fig. 8. ei. in whose margin,
the cellular series have their origin. With exception ol’
this extremely narrow, unoccupied stripe on the ventral
surface, the whole of the remainder of the rachis is beset
with polyps.
Below the above described developed polyps, a round
zooid is seen, which is well enclosed liv calcareous
spicules. It is probable, that zooids are found between the
series of the developed cells of the polyps.
The stem is round, and becomes reduced a little in
thickness, down towards the extremity, where, it forms a
conical bulb (fig. 8). The sarcosoma of the stem is rather
thick, and firm, owing to deposited spiculæ. The
spicules ol’ the stem are, variable in form and size, and the
greater number are triangular, somewhat flattened, and
have broad aculeated extremities and edges (tigs. Ill 14):
<< prev. page << föreg. sida << >> nästa sida >> next page >>
