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240
Articulation med det foregaaende. 3die Led er betydelig
kortere og bærer paa Spidsen flere særdeles complicerede
Vedhæng, hvoraf nogle er forsynede med Borster, andre
med korte Torner (se Fig. 21). Meget afvigende er dette
Fodpar bygget hos Hannen af Euchæta Prestandreæ, hvor
Endekloen paa venstre Fod er betydelig længere og fint
tilspidset, ligesom Vedhængene i Enden af hoire Fod er
af et meget forskjelligt Udseende.
Alle de under Expeditionen fra stort Dyb optagne
Exemplarer udmærkede sig ved en særdeles intensiv
blodrod Farve, der ogsaa strakte sig til de fleste af Kroppens
Vedhæng, med Undtagelse af Haleborsterne, der vare ganske
klare og hvis tætte Oilier skiftede i alle Regnbuefarver.
Derimod viste nogle mindre Exemplarer, tagne udenfor
Stor-eggen nær Vandskorpen med det fine Net, en langt mindre
iøinefaldende Farvetegning, idet de som sædvanlig var ganske
gjennemsigtige med kun et ganske svagt blegrødt Skjær paa
visse Dele af Legemet. Æggene i Æggesækken er, som
ovenfor anført, sædvanlig af en vakker blaa Farve.
Længden af de største under Expeditionen erholdte
Exemplarer gaar op til 12""", en for en fri Copepode colossal
Størrelse. Den sædvanlig ved vore Kyster forekommende
Fonn opnaar neppe mere end den halve Størrelse.
Forekomst og Udbredning. Vi har under vor
Expedition noteret denne smukke og anselige Copepode fra
ikke mindre end 12 forskjellige Stationer. Paa de
allerfleste af disse blev Exemplarerne optagne med Trawl eller
Bundskrabe fra meget betydelige Dybder, medens
Overfladenettet her, selv om det sænkedes dybt under Vandskorpen
ikke bragte et eneste Exemplar op. Det er heraf sikkert,
at Arten paa disse Punkter holdt sig i de dybere Vandlag.
Nøiagtig at angive, fra hvilken Dybde de er optagne, lader
sig dog vanskeligt gjøre; men der er Grund til at antage,
at de stammer fra de under det tempererede
Atlanterhavsvand liggende iskolde, Polarhavet oprindelig tilhørende
Vandlag.
Arten, der, som ovenfor anført, først er beskrevet som
særskilt Art af A. Boeck, og senere af Moebius fra
Pom-meranias Expedition i Nordsøen, forekommer ikke
ualmindelig langs vor hele Kyst, men opnaar her paa langt nær
ikke den Udvikling som i Nordhavets store Dyb, hvorfor
man er berettiget til at anse den for en høinordisk Fonn
i Modsætning til E. Prestandreæ. der er en sydlig eller
Atlanterhavsfonu.
of the left leg. and has at the point extending inward a
very small, somewhat unguiform appendix, representing the
rudimentary inner branch. The next articulation is slightly
inspissated in the middle, and very movably connected
with the preceding. The 3rd articulation is
considerably shorter, and bears at the point several exceedingly
complicated appendices, some of which are furnished with
bristles, others with cilia, others again with short spines
(see fig. 21). This pair of legs deviate very much, as to
structure, from the male of Euchæta Prestandreæ, the
terminal claw on the left leg being in this species considerably
longer, and acutely pointed; the appendices, too, at the
extremity of the right leg present quite a different appearance.
All the specimens brought up on the Expedition from
a great depth were distinguished by a vivid blood-red
hue. also characterizing most of the appendages of the
body, save the caudal bristles, which were quite pellucid,
and whose dense cilia kept constantly shifting in all the
tints of the rainbow. On the other hand, a few smaller
examples, taken off the Storeggen Baille, near the surface
of the water, in the finemeshed tow-net, had a far less
conspicuous coloration, being as usual quite translucent,
with only the faintest reddish tinge over certain parts of
the body. The eggs ill the ovisac are, as stated above,
of a beautiful blue colour.
The length of the largest specimens obtained on the
Expedition reaches 12""". — a colossal size for a free
Co-pepod. The form generally met with off’ the Norwegian
coast attains but little more than half that length.
Occurrence and Distribution. - - Oll the Norwegian
Expedition we bad to record this beautiful and large-sized
Copepod from as many as 12 different Stations. At by
far the greater number of these, the specimens were brought
up in the trawl or dredge, from very considerable depths,
whereas the surface-net, even when sunk in these localities
to a depth comparatively great, never succeeded ill taking
a single example. Hence, it is obvious, that the species
hereabouts must inhabit the deeper strata. Meanwhile, to
give the precise depth from which the specimens were
collected, would be a difficult matter; but there is reason to
assume as the habitat of the species the ice-cold strata of
the Polar current, extending beneath the temperate Atlantic
water.
This form, which, as stated above, was first described
specifically by A. Boeck, and subsequently by Moebius,
from the "Pominerania" Expedition in the North Sea, occurs
not infrequently along tile entire range of the Norwegian
coast, though far from attaining there a development
comparable to that it exhibits in the great deeps of the
Northern Ocean; and hence we are warranted ill regarding the
animal as a high Northern form, in contradistinction to
E. Prestamdreæ, which is a southern or Atlantic species.
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