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.
128
traadformig, noget kortere eiul Skaftet og sammensat af
circa 14 Led.
Hunddelene kunde ikke nøiere undersøges paa det
eneste foreliggende Exemplar.
lste Fodpar (Fig. 28) er betydelig kortere end de
øvrige og uddannet til et Slags Griberedskaber, skjøndt af
mindre kraftig Bygning end hos den typiske Art.
Basalleddet er meget smalt og næsten saa langt som alle de
øvrige tilsammen. 4de Led er noget, skjøndt ikke meget
opsvulmet og i den indre Kant forsynet med 3 stive
Borster. Sidste Led er meget bevægeligt forbundet med dette
og kan slaaes ind mod samme; det ender med en stan-k,
tydeligt 2-leddet Klo.
De øvrige Fodpar er alle af ens Udseende, ægte
Gangfodder og af en særdeles spinkel Bygning. De
tiltager noget i Længde forfra bagtil og viser sig ordnede i
2 Sæt, idet de 3 forreste er adskilte fra de 3 bagerste ved
et meget betydeligt Mellemrum, der indtages af det ovenfor
omtalte mediane Kropsafsnit.
Halevedhængene (se Fig. 29) er meget smaa og synes
kun at bestaa af et enkelt konisk Led, der ved Spidsen
har nogle fine Borster.
Dyrets Farve er ensformig skidden graalig, omtrent
som det Mudder, hvori det lever.
Længden af det undersøgte Individ er kun 4.20*"".
Forekomst og Udbredning. Et enkelt Exemplar af
denne distincte Art optoges i Bundskraben under
Expedi-tionens 2det Togt i Havet Vest af Lofoten fra et Dyb af
778 Favne.
Om Artens Udbredning kan Selvfølgeligt intet med
Bstemthed anføres; men da den ovennævnte Station tilhorer
den kolde Area, er der al Rimelighed for. at den er en
ægte arktisk og for de nordlige Have eiendommelig Form.
simple-cylindric. The flagellum is filiform, somewhat shorter
than the peduncle, and composed of about 14 articulations.
The oral appendages could not be submitted to close
examination in the sole specimen obtained.
The 1st pair of legs (fig. 28) are considerably shorter
than the rest, and developed as a kind of prehensile organs,
though less powerful in structure than in the typical species.
The basal joint is exceedingly slender, and well-nigh as
long as all the others taken together. The 4th joint is
somewhat, though not much, swollen, and furnished along
the inner margin with 3 stiff bristles. The last joint is
verv movably connected with the latter, and admits of
being bent in towards it; this last joint terminates in a
strong, distinctly bi-articulate claw.
The remaining pairs of legs are all uniform in
appearance, being true pereiopoda, and exceedingly slender
in structure. They increase somewhat in length posteriorly,
and are arranged in 2 series, the 3 anterior being separated
trom the 3 posterior pairs by a very considerable interspace,
occupied by the aforesaid medial section of the body.
The caudal appendages (see fig. 29) are very small,
and would appear to consist of but one conical joint,
furnished at the extremity with a few delicate bristles.
The colour of the animal is a uniform dirty grey,
much the same as that of the mud in which it lives.
Length of the specimen examined only 4.20™"’.
Occurrence and Distribution. — A single specimen
of this distinctly characterized species was brought up in
the dredge on the 2nd cruise of the Expedition, in the open
sea west of Lofoten, from a depth of 778 fathoms.
Respecting the distribution of the species, nothing cail
of course be stated with certainty; but the Station at which
the specimen was taken being in the cold area, there is
every reason to regard the animal as a true Arctic form,
peculiar to the fauna of the Northern Seas.
Fain. 2. Muimopsidæ, Lilljeborg.
i Isopoda remigantia, G. O. Sars)
Bemærkninger. De til denne Familie hørende
Isopoder udmærker sig i hoi Grad ved den mærkværdige
Bygning af de 3 bagerste Fodpar, der er meget ulige de øvrige
saavel i Form soil) Function, idet de er uddannede til
mægtige Svømmeredskaber, hvormed Dyret kan, ofte med
stor Fart, bevæge sig frit om i Vandet i baglænds Retning.
Denne Character er i Virkeligheden saa eiendommelig og
ulig alt, hvad vi hidtil kjendte, at jeg i Begyndslsen blev
forledet til herpaa at grunde en ganske egen Isopodetribus,
Fain. 2. Muimopsidæ, Lilljeborg.
ilsopoda remigantia, G. G. Sars)
Remarks. — The Isopoda belonging to this family
are very prominently distinguished by the remarkable
structure of the 3 posterior pairs of legs, differing most essentially
as they do alike in form and function, being developed to
powerful natatory organs, by means of which the animal,
often with great rapidity, cail move through the water in a
backward direction. This character is indeed so peculiar
and unlike anything hitherto observed, that at first I felt
disposed to establish from it a distinct tribe of Isopods,
<< prev. page << föreg. sida << >> nästa sida >> next page >>
