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.
10-2
Sidt’ nær Basis af Endesegmentet og lige under den
triangulære Sidefortsats med en kort og tyk Stilk og kan ved
særegne Muskler slaaes til Siden ligesom de 2 Floie paa
en Port. Ved Spidsen bærer de hver 2 korte ovale
Ende-grene. hvoraf den ene er særdeles liden og ganske dækket
af den anden (se Fig. 21) samt besat med korte Borster.
Farven er i levende Tilstand ensformig skidden
gulbrun. Øinenes Pigment kulsort.
Længden af de storste erholdte Individer er, fraregnet
Folerne, 40™"’.
Forekomst. Flere smukke Exemplarer af denne
cliar-acteristiske Isopode toges under Expeditionens 1ste Togt i
Havet Øst af Island (Ståt. 48) fra et Dyb af 300 Favne.
Under sidste Togt erholdtes endnu et Par Exemplarer af
samme Art udenfor Vestkysten af Spitsbergen (Ståt. 359).
Dybden 416 Favne.
Udbredning. Arten er tidligere kjendt fra Færoerne.
Island, Spitsbergen, Grønland og Polarøerne, og maa
betragtes som en ægte arktisk Form.
at the base of the terminal segment, and immediately
beneath the triangular lateral projection, by a short and thick
pedicle, and admit, by the use of specially adapted muscles,
of being pushed back, like the leaves ol’ a folding door.
Åt the point, they have each 2 short, ovate terminal branches,
one of which is exceedingly small and completely covered
by the other (see fig. 21), as also beset with short bristles.
Colour, when alive, a uniform dirty vellowish-brown;
ocular pigment a coal-black.
Length of the largest specimens obtained — excluding
the antennæ — 41
Occurrence. — Several fine examples of this
characteristic Isopod were collected on the 1st cruise of the
Expedition. in the open sea. east of Iceland (Ståt. 48). from
a depth of 300 fathoms. On the last cruise two more
specimens of the same animal were taken, off the west
coast of Spitzbergen (Ståt. 359); depth 416 fathoms.
Distribution. — The species had been previously
known from the Færoes, Iceland. Spitzbergen, Greenland,
as also the Islands of the Polar Sea north of America, and
must, therefore, be regarded as a true Arctic form.
21. Arcturus tuberosus. G. O. Sars, n. sp.
(PI. IX. Fig. 22l.
A roturne tuterosm, O. O. Sars, Prodromus descript. Crust, etc.. No. 72
(1870).
Arcturus lajfini, var. Feildeni, Miers, Report on the Crustacea collected
by the Naturalists of the arctic Expedition in 1870—7« (Ann.
Nat. Hist. 1877), pg. 14. Pl. III. Fig. I.
Artseharacteristik. Legemet noget mere undersætsigt
end hos foregaaende Art, uden tydelige Haar og uden dorsale
Torner, men med uregelmæssig knudret < Iverflade.
Epi-mererne paa de 3 bagerste Forkropssegmenter stumpt
tilspidsede. Endesegmentet med jevnt hvælvet Overflade.
Øinene store, triangulært nyreformige. 2det Par Følere
betydelig længere end Legemet, med 7-leddet Svøbe.
Farven blegt kjødfarvet. Længden 35""".
Findested. Ståt. 18.
Bemærkninger. Den her omhandlede Fonn staar
foregaaende saa overmaade nær, at jeg har været i stor
Tvivl om dens Gyldighed som distinct Art. især da der
blot forelaa til Undersøgelse et enkelt Exemplar. Jeg
opførte den derfor i min Prodromus kun med Forbehold som
en ny Art og yttrede, at den muligvis kun vilde vise sig
at, være en ganske tilfældig Varietet af foregaaende. Aaret
efter blev imidlertid den samme Fonn beskrevet af Miers
fra den Engelske Nordpolexpedition i 1875—76 og angivet
at forekomme endog i Mængde paa en Localitet. uden at
21. Arcturus tuberosus. G. O. Sars, n. sp.
i PI. IX. fig. 22).
Arcturus Mer..mt, »). O. Surs. Prodromus descriptiönis Crust etc.. Nn.
72 (187(i).
Arcturus baffui. var. Keildeni. Miers, Report on the Crustacea collected
hy the Naturalists of the Arctic Expedition in 187Ö—7(1 (Ann.
Nat. Hist. 18771. p. 14, PI. III. fig. I.
Specific Character. — Body a trifle more thickset
than in the preceding species, without distinctly perceptible
hairs and without dorsal spines, but presenting an irregular
rugged surface. Epimera on the 3 posterior pedigerous
segments obtusely pointed. Terminal segment with
uniformly arcuate surface. Eyes large, triangular-reniform.
Second pair of antennæ considerably longer than body,
with a seven-jointed Hagelluin. Colour a light pink. Length
35"™’.
Locality. — Ståt. 18.
Remarks. — The form to In* treated (if here
approximates so closely the preceding, that I have felt very greatly
in doubt concerning its title to specific distinctness, and
the more so since but one specimen only lay before me
for examination. Hence. I recorded the animal in my
"Prodromus" with considerable reservation as a new species,
stating that it possibly would turn out to be a mere casual
variety of the preceding. Meanwhile, the vear after the
same form was described by Miers from the English North
Pole Expedition in 1875—76. and said by him to occur
<< prev. page << föreg. sida << >> nästa sida >> next page >>
