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41
Inderkanten. Begge Fingre er stærkt chitiniserede og
derfor af mørk hornbrun Farve. Ilos yngre Individer (=r P.
discoidea, Krøyer) viser disse Lemmer (se Fig. 3 h) et
temmelig afvigende Udseende og er idethele betydelig svagere
udviklede end hos fuldvoxne Exemplarer. Navnlig er Saxen
meget forskjellig. Den er nemlig paa langt nær ikke saa
stærkt opsvulmet og af temmelig regelmæssig oval Fonn,
med Fingrene udstrakte i Palmens Axe samt endende i en
fin, noget indbøiet Spids. Inderkanten af begge Fingre er
desuden fint tandet i hele Længden, og den ubevægelige
Finger mangler ethvert Spor af det stærke knudeformige
Fremspring, som forefindes her hos fuldvoxne Individer.
De falske Fødder, der er fæstede noget ventralt,
nedenunder Forkanten af de forreste Sidefortsatser, er
forholdsvis korte, navnlig hos Hunnen. Hos Hannen er de vistnok
noget længere (se Fig. 3 a), men opnaar dog neppe
Legemets Længde. 5te Led har hos Hannen ved Enden en
lignende fligformig Fortsats som hos foregaaende Slægt. De
4 ydre Led (Fig. 3 d) aftager successivt i Størrelse og er
langs Inderkanten forsynede med en Del temmelig
uregelmæssigt ordnede Torner uden Sidetænder (Fig. 3 e). Det
forholdsvis lille sidste Led har kun 2 saadanne og bærer i
Spidsen en vel udviklet Endeklo, der i Inderkanten er fint
tandet.
Gangfødderne (se Fig. 3, 3 f) er af usædvanlig kort
og robust Form, neppe mere end dobbelt saa lange som
Kroppen, og bevæbnede med talrige koniske, i Kanterne
fint, haarede, pigformige Fortsatser, hver bærende i Spidsen
en stiv Børste. Disse Fortsatser er paa de 2 Lægled
temmelig regelmæssigt ordnede i 3 Rækker, hvoraf de i den
ydre Kant fæstede navnlig er stærkt udviklede, givende
Fødderne her et regelmæssigt saugtakket Udseende (se Fig.
3 f). Paa Laarleddet er de noget mere uregelmæssigt
ordnede, og paa Hoftepartiet grupperer de sig især om Enden
af Leddene. Som hos foregaaende Slægt, er Laarleddet hos
fuldt udviklede Hunner (Fig. 3) stærkt opsvulmet paa Grund
af de sig i dets Indre udviklende Æg, der dog her aldrig
opnaar en saa betydelig Størrelse. Hos Hannerne er dette
Led (se Fig. 3 f) adskilligt smalere, noget indsnøret paa
Midten og desuden udmærket ved 2 stærke afrundede
Knuder i Inderkanten; en lignende Knude findes ogsaa paa
ethvert af de 2 følgende Led nær Basis. Angaaende
Leddenes indbyrdes Længdeforhold, saa er Laarleddet omtrent saa
langt som de 3 Hotteled tilsammen; lste Lægled er omtrent
af Laarleddets Længde, medens 2det er kjendelig længere
og smalere. Tarsalleddet er meget lidet, dog forholdsvis
større end hos foregaaende Slægt, af triangulær Form, med
Inderkanten skydende ud i en afrundet, med korte Torner
besat Lap. Fodleddet er kraftigt udviklet og temmelig
stærkt krummet; det er langs Inderkanten bevæbnet med
omkring 8—10 stærke Torner, hvoraf de 4 bagerste er størst.
Endekloen er stærkt chitiniseret, noget kortere end
Fodleddet og jevnt krummet. Af Bikløer er der ikke det
mindste Spor at opdage.
Den norske Nordllavsexpedition. G. O. Sars: Pycnogonidea. 12
projection in the middle of the inner margin. Both fingers
are highly chitinized and therefore of a dark horny brown
colour. In young specimens (= P. discoidea, Krøyer) these
limbs exhibit a rather deviating appearance (see fig. 3 h)
and are, on the whole, much less developed than in
full-grown examples. The chela especially is very different.
It does not occur nearly so tumid and has a rather
regular oval form, with the fingers extended in the axis
of the palm and ending in a fine, somewhat incurvate
point. The inner edge of both fingers, moreover, is
delicately dentated throughout its whole length, and the
immobile finger fails to exhibit any trace of the prominent
nodular projection, found here in adult specimens.
The false legs, which are attached somewhat ventrally
underneath the anterior edge of the foremost lateral processes,
are comparatively short, more especially in the female. In the
male they are, indeed, somewhat longer (see fig. 3 a), but hardly
attain the length of the body. The 5th joint in the male
has, at the extremity, a lobular process similar to that in the
preceding genus. The 4 outer joints (fig. 3 d) diminish
successively in size, and are furnished along the inner edge
with a number of rather irregularly disposed spines without
lateral teeth (fig. 3 e). The last, comparatively small joint
has only 2 such spines, and bears at the point a well
developed terminal claw, finely dentated on the inner edge.
The ambulatory legs (see fig. 3, 3 f) are remarkably
short and robust in form, scarcely more than twice as long as
the body, and armed with numerous conical spiniform
projections delicately ciliated on the edges, each bearing at the tip
a stiff bristle. On the 2 tibial joints these projections are
rather regularly arranged in 3 series, those attached to the
outer edge being, in particular, strongly developed, imparting
to the legs here a regular serrate appearance (see fig. 3 f).
On the femoral joint they are somewhat less regularly disposed,
and on the coxal part they group themselves mostly about
the extremity of the joints. As in the preceding genus, the
femoral joint in fully developed females (fig. 3) is very much
swollen, OAving to the eggs in course of developement within,
which do not, however, attain here any considerable size. In
the males this joint (see fig. 3 f) is much more slender,
somewhat constricted in the middle, and distinguished, moreover,
by 2 prominent rounded protuberances on the inner edge;
a similar protuberance is also found on each of the 2
succeeding joints near the base. Respecting the mutual
longitudinal relation of the joints, the femoral joint is about as
long as the 3 coxal joints taken together; the lst tibial joint is
about the length of the femoral joint, whereas the 2nd is
appreciably longer and narrower. The tarsal joint is very small,
yet comparatively larger than in the preceding genus,
triangular in form, with the inner edge projecting as a rounded
lobe, beset with short spines. The propodal joint is powerfully
developed and rather strongly curved; it is armed along
the inner edge with about 8—10 strong spines, the 4
hindmost of which are largest. The terminal claw is highly
chitinized, somewhat shorter than the propodal joint, and evenly
curved. Of auxiliary claws not a trace can be detected.
6
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