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54
(jen. Boreomysis, G. 0. Sars. 1869.
Undersøgelser over Christianiafjordens Dybvandsfauna.
10. Boreomysis nobilis, G. O. Sars, n. sp.
Boreomysis nobili . G. 0. Sars, Crustacea et Pycnogonida nova etc.,
No. 2.
Artscharacteristik. Bygskjoldet fortil i Midten stærkt
udbuet og gaaende ud i en horizontal, tilspidset,
rostrum-lignende Fortsats; de nedre forreste Sidehjørner udtrukne i
Fonn af Iancetdannede Flige. Øinene korte og tykke, næsten
cirkelformige, noget affladede, neppe fremragende til Siderne,
med rødbrunt Pigment. 1ste Par Foleres Skaft af et
lignende Udseende som hos B. ardica. 2det Par Føleres
Blad mere end dobbelt saa langt, stærkt afsmalnende mod
Enden, næsten lancetformigt; Spidsen meget smal og skjævt
afskaaret i Betningen udenfra indad, med en stærk Torn
ved det ydre Hjørne. Føddernes ydre Del, foruden
Endekloen. bestaaende af 3 Led. det sidste meget smalt.
Bagkropslemmerne hos Hannen af samme Bygning som hos
den typiske Art. Det midterste Halevedhæng
aflangt-lir-kantet, med Sidekanterne næsten lige og, naar undtages
det basale Parti, bevæbnet med talrige Torner; det bagre
Indsnit af sædvanlig Form. med Kanterne grovt tandede
og Sidelapperne i Spidsen stumpe. Legemet i levende
Tilstand prydet med lyserødt Pigment. Længden indtil CO’™.
Pindested. ’Stat. 362.
Bemærkninger. Skjøndt særdeles nærstaaende den
typiske Form, B. ardica, er denne nye Art dog let
kjendelig fra samme ved sin usædvanlige Størrelse, det
fuldkommen horizontale, ikke opadbøiede Pandehorn, de kortere
og tykkere Øine og de i sin Fonn meget afvigende
Antenneblade.
Arten foreligger kun i et enkelt Exemplar, en fuldt
udviklet Han, hvorefter nedenstaaende Beskrivelse er
affattet.
Beskrivelse. Kropsformen er (se PI. V, Fig. 22, 23)
temmelig slank, men kraftig og idethele meget lig samme
hos de to nærstaaende Arter, B. ardica Kr. og B. tridens,
G. O. Sars.
Rygskjoldet er forholdsvis stort, men viser sig dog
bagtil i Midten tydeligt udrandet, saa at sidste
Forkrops-segment for en Del bliver ubedækket oventil. Dets forreste
Parti er i Midten stærkt udhuet og udtrukket i et skarpt
tilspidset, rostrumlignende Fremspring, der er fuldkommen
horizontalt og rækker omtrent til Enden af 1ste Par
Føleres Basalled. Fra dette Fremspring strækker sig en kort,
men tydelig Kjøl bagtil, uden dog at naa Cervicalfuren.
Til Siderne er de forreste Kanter af Rygskjoldet dybt
udrandede og danner nedentil en tilspidset fortilrettet Flig,
der ligger tæt ind til Ydersiden af 2det Par Føleres Roddel.
Gen. Boreomysis, G. O. Sars, 1869.
Undersøgelser over Christianiafjordens Dybvandsfauna.
10. Boreomysis nobilis, G. G. Sars, n. sp.
Boreomysis nobilis, G. O. Sars, Crustacea et Pycnogonida nova etc.,
No. i.
Speeifie Character. — Carapax anteriorly produced in
the middle, and extending as a horizontal, pointed,
rostrum-like projection; the lower and foremost lateral corners
produced in the form of lanceolate lobes. Eyes short and
thick, almost circular, somewhat bevelled, projecting very
little, if at all, to the sides, and furnished with a
reddish-brown pigment. Peduncle of 1st pair of antennæ similar
in appearance to that in B. ardica. Scale of 2nd pair of
antennæ more than twice as long, abruptly tapering towards
the end. almost lanceolate; its extremity very slender,
obliquely truncate, from within to without, and having a strong
spine at the outer corner. Exterior portion of legs, not
including the terminal claw, composed of .3 articulations,
the last exceedingly slender. Abdominal limbs in male
exhibiting the same structure as in the typical species.
Telson oblongo-quadrate, with the lateral margins almost
straight, and. saving the basal portion, armed with numerous
spines; posterior incision of the usual form, with the margins
coarsely dentate, and the lateral lobes obtuse. Body, in a
living state, brilliantly coloured with a liglit-red pigment.
Lengtli reaching 60""".
Locality. — Ståt. 362.
Remarks. — Though closely approaching the typical
form, B. ardica, this new species may be easily distinguished
from the latter by its unusual size, by the rostrum, which
is perfectly horizontal and not bent upwards, by the shorter
and thicker eyes, and by the deviating form of the antennal
scales.
The species is represented as yet by a single
specimen only, a fully developed male, from which the following
description is given.
Description. — The body (see Pl. V, figs. 22, 23)
comparatively slender, but powerful, and, on the whole,
presenting considerable resemblance to that in the two
approximating species, B. arctic Kr. and B. tridens, G. O.
Sars.
The carapax is comparatively large, but in the middle
distinctly einarginate posteriorly, so that the last segment
of the cephalo-thorax is partially uncovered above. Its
foremost part is very considerably produced in the middle,
and drawn out as a sharp-pointed, rostrum-like projection,
perfectly horizontal, and reaching about to the end of the
basal joint of the 1st pair of antennæ. From this
projection extends posteriorly a short but distinct keel, without
however reaching the cervical groove. At the sides, the
anterior borders of the carapax are deeply emarginate.
forming below a pointed, anteriorly directed lobe, lying
close in to the outer side of the basal portion of the 2nd
pair of antennæ.
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