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97
Slægt. AstaczUa. Begge staar hinanden vistnok meget nær;
men det lader sig dog gjøre at opstille en Del distinctive
Characterer, der ialfald for Tiden vil kunne tillægges generisk
Værd. og jeg har derfor troet at burde holde disse 2 Slægter
ud fra hinanden.
succeeding, viz. to the genus Astacilla. Both do indeed
approximate very closely; but a number of distinctive
characters can however be found that, leastways at present,
have warrantable generic value: and hence T have seen fit
to keep these 2 genera apart.
20. Arcturus baffini. Sab.
(Pl. IX, Fig. 1—-21).
Mot!«a baffini, Sabine. Appendix to Parry’s Iste Voy. pg. .’»0, Pl. I,
Fig. 4—0.
Arcturus tubercvlattis, Latreille i Cuvier’s Regne animal, Vol. IV, pg. 139.
Arcturus baffini, West wood. Trans. Entom. Soc. Lond.. Vol. I, pg. 72.
Artscharacteristik. Legemet ovalt, loddent af korte
og stive Haar. med en dobbelt Rad af koniske, opadrettede
Fortsatser langs ad Ryggen. Epimererne paa de 3 bagerste
Forkropssegmenter triangulært tilspidsede og stærkt
udstaaende til Siderne. Sidste Bagkropssegment bagtil koniskt
uddraget, med 2 triangulare Sidefortsatser ved Basis og 2
smaa Torner paa Midten af Rygfladen. Øinene store og
fremstaaende, af nyredannet Fonn og forsynede med mørkt
Pigment. 1ste Par Føleres Svøbe forsynet med talrige
Sandsevedhæng. 2det Par Folere betydelig længere end
Legemet, med Svøben sammensat af 8 Led. Farven lys
brungul. Legemets Længde indtil 40""".
Findesteder. Ståt. 48, 359.
Bemærkninger. Nærværende anselige Art er først
beskreven og afbildet af Sabine i Appendixet til Parry’s
lste Nordpolexp edition. men er senere, saavidt mig bekjendt,
ikke underkastet nogen fornyet Undersøgelse, skjøndt den
flere Gange er gjenfunden og nævnt af mange forskjellige
Forfattere. Latreille’s Slægt Arcturus er utvivlsom grundet
paa denne Art, hvorfor ogsaa det oprindelige Slægtsnavn
her maa anvendes. Den her omhandlede Art er saaledes
Typen for Slægten Arcturus og tillige for Familien
Arc-turidæ.
Beskrivelse af Hunnen. Legemet er (se PI. TX,
Fig. 1 og 2) næsten af cylindrisk Fonn. omtrent 7 Gange
længere end bredt og er overalt loddent af korte og stive
Haar. Dets Overflade er forøvrigt temmelig ujevn, idet
Segmenterne er skilte ved temmelig dybe Indsnøringer og
forsynede med afrundede Forhoininger og Fordybninger
samt med en Del symetriskt ordnede høie koniske
Fortsatser, der danner en dobbelt Række langs ad Ryggen.
Integumenterne er stærkt incrusterede og viser overalt
en fint knudret eller granuleret Sculptur.
Hovedet er omtrent af samme Brede som Længde,
fortil neppe afsmalnende og her næsten lige afskaaret eller
i Midten ganske svagt udrandet. ()ventil er det forsynet
Den norske Nordhavsexpedition. G. O. Sars: Crustacea.
20. Arcturus baffini, Sab.
(Pl. IX. figs. 1—21).
Idothta baffini, Sabine. Appendix to Parry’s First Voy. p. 50, PI.
figs. 4—(>.
A return s tuberculatus, Latreille, in Cuvier’s Hegne animal. Vol. IV, p. 139.
Arcturus baffini, Westwood. Trans. Entom. Soc. Lond.. Vol. I. p. 72.
Specific Character. Body everywhere clothed with
short and stiff hairs, and furnished along the back with
a double series of conical, upward - directed projections.
Epimera on the 3 posterior pedigerous segments triangularly
pointed, and prominently projecting at the sides. Last
abdominal segment conically produced posteriorly, with 2
triangular lateral projections at the base, and 2 small spines
in the middle of the dorsal surface. Eyes large and
protruding. reniform in shape, and provided with a dark
pigment. Flagellum of 1st pair of antennæ with numerous
sensory appendices. Second pair of antennæ considerably
longer than body, with flagellum composed of 8 joints.
Colour a light brownish- yellow. Length of body
reaching 4Um’\
Locality. — Stats. 48. 359.
Remarks. — The present large species was first described
and figured by Sabine, in the Appendix to Parry’s First North
Pole Expedition, but has subsequently, so far as I am
aware, not been again submitted to any closer
examination. though several times met with and recorded by various
authors. Latreille’s genus Arcturus is unquestionably founded
on this species: and hence the original generic designation
should be retained. The species treated of here is
accordingly the type of the genus Arcturus. and likewise of the
family Arcturidæ.
Description of the Female. — The body (see PI.
IX. tigs. 1. 2) is almost cylindric in form, about 7 times
longer than broad, and everywhere clothed with long and
stiff hairs. Its surface is, for the rest, rather uneven, the
segments being separated by rather deep instrictions. and
having rounded prominences and depressions, as also a
number of symmetrically arranged, high, conical projections,
constituting a double series along the back.
The integuments are strongly incrusted. and exhibit
everywhere a minutely rugged, or granulous sculpturing.
The head has about the same breadth as length, tapering
scarcely at all anteriorly! where it is abruptly truncate,
or. in the middle, slightly emarginated. Above, it exhibits
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