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9 (i
Forekomst og Udbredning. En Del Exemplarer af
denne Art erholdes under Expeditionen sidste Togt paa 2
forskjellige Stationer, den ene (Ståt. 290) beliggende
omtrent midt imellem Norge og Beereu Eiland, den anden
(Ståt. 359) lige Vest af Spitsbergen; Dybden fra 191 til
416 Favne. Ingen af disse Stationer tilhører egentlig den
kolde Area, skjondt den sidste ligger lige ved Grændsen af
samme. Om Artens Udbredning kan for Tiden kun siges
saameget, at den ligger indenfor den arktiske Zone fra den
72de til den 78de Bredegrad.
Trib. 3. Yalvifera.
Anmærkninger. Under denne Tribus sammenfatter
jeg de Isopoder, hos hvem sidste Par Bagkropslemmer eller
Halevedlneugene er omformede til valvelformige Klapper,
der fra liver Side hvælver sig ud over de øvrige
Bagkrops-lemmer, saaledes at disse kommer til at ligge i en rummelig
af det skjoldformige Endesegment oventil dækket Hule.
Den indeholder 2 distincte Familier. Arcturidæ og Idotheidæ.
hvoraf Repræsentanter nedenfor nærmere vil blive beskrevne.
Fam. I. Arcturidæ.
Gen. 1. Ai’ctui’us, Latr. 1804.
Hist. nat. des Crustacés et des Insects.
Slægtseharacteristik. Legemet af forholdsvis
undersætsig Form. cylindriskt eller tendaunet. med 4de
Forkrops-segment kun lidet længere end de øvrige. 2det Par Føleres
Svøbe med simple, ikke saugtakkede Led. lste Fodpar
forholdsvis lidet, med næstsidste Led smalt og forlænget,
sidste Led meget lidet, uden Klo. Hunnens Brystpose
sammensat af 3 Par tydelige Plader, tilhørende 2det— 4de
For-kropssegment.
Bemærkninger. I den Begrændsning. hvori Slægten
her tages, indbefatter den foruden de 3 nedenfor nærmere
omtalte Former kun den af Miers1 fra Magellan-Strædet
beskrevne Ardurus Coppingeri. Alle de øvrige til denne
Slægt henførte Arter hører derimod ind under følgende
1 Proceedings of the ZnoJ. Sne. of London, Jan. 4. ISHI.
Occurrence and Distribution. — Some few examples
of this species were obtained on the last cruise of the
Expedition. at 2 different Stations, one (Ståt. 290) located
about midway between Norway and Beeren Eiland, the
other (Ståt. 359) due west of Spitsbergen; depth ranging
from 191 to 416 fathoms. Neither of these Stations was
strictly within the cold area, although the latter lay in close
proximity to its boundary. As regards the distribution of
the species, all that at present can be said amounts to the
fact of its occurrence within the Arctic zone, from the 72nd
to the 78tli parallel of latitude.
Trib. 3. Valvifera.
Remarks. — Within this tribe 1 comprise all Isopods
in which the last pair of abdominal limbs or the caudal
appendages are transformed into valvular flaps, that, from
either side, arch out over the other pairs, in such manner
as to leave them in a spacious cavity, covered above by
the scutiform terminal segment. It contains 2 distinct
families - the Arcturidæ and the Idotheidæ. of which
representatives will be described in detail below.
Faiu. I. Arcturidæ.
Gen. 1. Aretnrus, Latr. 1804.
Hist. nat. des Crustacés et des Insects.
Generie Character. — Body comparatively thickset
in form, cylindric or fusiform, with the 4th segment but
little longer than the others. Flagellum of 2nd pair of
antenna’ with simple, non-serrate joints. First pair of legs
comparatively small, with penultimate joint slender and
elongate, terminal joint exceedingly small, and without any
claw. Marsupium of female composed of 3 pairs of distinct
plates, belonging to 2nd. 3rd, and 4th pedigerous segments.
Remarks. Within the limits here assigned to the
genus, it comprises, exclusive of the 3 forms treated of
in detail below, but one other species, Aretnrus Coppmgeri.
from the Straits of Magellan, described by Miers.1 All
the other species referred to this genus belong to the
1 Proceedings of the Zool. Soc. "f London, .fan. 4th, 1SS1.
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