54 
Gen. Boreomysis, G. 0. Sars, 1869. 
Unders0g6lser over Christiaiiiafjordens Dybvandsfauna. 
10. Boreomysis nobilis, G. O. Sars, n. sp. 
Boreomysis nobilis, G. 0. Sars, Crustacea et Pycnogonida nova etc., 
No. 12. 
Artseharaeteristik. Rygskjoldet fortil i Midten staerkt 
udbuet og gaaende ud i en horizontal, tilspidset, rostram- 
lignende F ortsats ; de nedre iorreste Sidehjorner udtrukue i 
Form af lancetdannede Flige. 0inene korte og tykke. naesten 
cirkelformige, noget affladede, neppe fremragende til Siderne, 
med rpdbrunt Pigment, lste Par Foleres Skaft af et lig- 
nende Udseende som bos B. arctica. 2det Par Foleres 
Blad mere end dobbelt saa langt. staerkt afsmalnende mod 
Enden. nsesten lancetformigt; Spidsen mcget smal og skjsevt 
afskaaret i Retningen udenfra indad, med en stserk Torn 
ved det ydre Hjorne. Foddernes ydre Del, foruden Ende- 
kloen. bestaaende af 3 Led, det sidste meget smalt. Bag- 
kropslemmerne hos Hannen af samme Bygning som bos 
den typiske Art. Det midterste Halevedbseng aflangt-fir- 
kantet, med Sidekanterne nsesten lige og, naar undtages 
det basale Parti, bevsebnet med talrige Torner; det bagre 
Indsnit af ssedvanlig Form, med Kanterne grovt tandede 
og Sidelapperne i Spidsen stumpe. Legemet i levende Til- 
stand prydet med lyserodt Pigment. Lscngden indtil 60’"“. 
Findested. Stat. 362. 
Bemaerkninger. Skjondt saerdeles naerstaaende den 
typiske Form, B. arctica, er denne nye Art dog let kjen- 
delig fra samme red sin ussedvanlige Stprrelse, det fuld- 
kommen borizontale, ikke opadboiede Pandehorn, de kortere 
og tykkere Dine og de i sin Form meget afvigende An- 
tenneblade. 
Arten foreligger kun i et enkelt Exemplar, en fuldt 
udviklet Han, hvorefter nedenstaaende Beskrivelse er af- 
fattet. 
Beskrivelse. Kropsformen er (se PI. Y, Fig. 22. 23) 
temmelig slank, men kraftig og idethele meget lig samme 
hos de to naerstaaende. Arter, B. arctica Kr. og B. tridens, 
G. 0. Sars. 
Rygskjoldet er forholdsvis stort, men viser sig dog 
bagtil i Midten tydeligt udrandet, saa at sidste Forkrops- 
segment for en Del bliver ubedaekket oventil. Dets forreste 
Parti er i Midten staerkt udbuet og udtrukket i et skarpt 
tilspidset, rostrumlignende Fremspring, der er fuldkommen 
horizontalt og raekker omtrent til Enden af lste Par Fo- 
leres Basalled. Fra dette Fremspring straekker sig en kort, 
men tydelig Kjol bagtil, udeu dog at naa Cervicalfuren. 
Til Sideme er de forreste Ivanter af Rygskjoldet dybt ud- 
randede og danner nedentil en tilspidset fortilrettet Flig, 
der ligger taet ind til Ydersiden af 2det Par Fpleres Roddel. 
Gen. I loreonn sis, G. 0. Sars, 1869. 
Undera0gelser over Cliristianiafjordens Dybvandsfauna. 
10. Boreomysis nobilis, G. 0. Sars, n. sp. 
Boreomysis nobilis, G. O. Sars, Crustacea et Pycnogonida nova etc., 
No. 2. 
Specific Character. — Carapax anteriorly produced in 
the middle, and extending as a horizontal, pointed, rostrum- 
like projection; the lower and foremost lateral corners pro- 
duced 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 antenna 1 similar 
in appearance to that in B. ardica. Scale of 2nd pair of 
antennae more than twice as long, abruptly tapering towards 
the end. almost lanceolate; its extremity very slender, ob- 
liquely 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 light-red pigment. 
Length reaching 60““. 
Locality. — Stat. 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 speci- 
men only, a fully developed male, from which the following 
description is given. 
Description. — The body (see PI. V, figs. 22, 23) 
comparatively slender, but powerful, and, on the whole, 
presenting considerable resemblance to that in the two ap- 
proximating species, B. ardic Kr. and B. tridens, G. O. 
Sars. 
The carapax is comparatively large, but in the middle 
distinctly emarginate 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 antennae. From this projec- 
tion 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 antennae. 
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