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Beskrivelse. Legemet er (se PI. XIV. Pig. 3) noget 
Sf inni)entrykt fra Siderne og af mindre plump Bygning end 
hos de til SI. Pleustes hen forte Former. Ligeledes er Tn- 
e gumenterne meget tyndere og mere gjeunemsigtige. 
Hovodet or forholdsvis lidet og gaar fortil i Midten 
U( 1 i et kort, men temmelig bredt, nedadkrummet Pandehorn, 
^idekanterne danner mellem Fmstet af de 2 ParFolere en 
smalt tilrimdot Lap og er bag Roden af 2det Par udtrukne 
* e t skarpt Hjorne. 
Alle Forkropssegmenter og de 3 forrest© Bagkrops- 
Se gMepter er oventil langs ad Midten fcydeligt kjolede og 
forsynede med hoie sammentrykte dorsale Fortsatser. Af 
disso sidste er de 3 forreste mindre sterlet udviklede og i 
Enden afrundede, de 6 f'olgende derimod saerdeles store, 
kuicetformige og bagudrettede ; den sidste endelig, dor ud- 
gaar fra 3die Bagkropssegment, er trianguhert tilspidset og 
n oget opadrettet. De folgende 3 Bagkropssegm enter er 
°ventil jevnt hvaelvede, uden Kjol eller Fortsatser. 
Do 4 forreste Par Epimerer er temmelig hoie, men 
s 'imle og noget skjsevt fortilrettede, med den bagre Rand 
Mydeligt crenuleret. 4de Par er storst og i Midten af den 
bagre Kant udtrukket i et skarpt Hjorne. De 3 bagre 
Par Epimerer er betydelig lavere og utvdeligt 2-lappedc. 
3die Bagkropssegments Sideplader ender bagtil i en 
s karp noget opadboiet Spids, 
Dinene er temmelig smaa, Jovale eller noget nyredan- 
not le, med den forreste Rand svagt indbugtet. Deres Pig- 
n ient er af rodgnl Farve. 
lste Par Folere er meget sterkt forlsengede, omtrent 
,lt hele Legemets Lmngde, og har Skaftets lste Led tem- 
Ul elig stort, lamgere end de 2 folgende Led tilsammen. 
Svoben er sferdeles tynd og sammensat af et stort Antal 
korte Led. 
2det Par Folere er neppe halvt saa lange og har 
®kaftet omtrent af samme Lsengde som paa lste Par, hvor- 
lm °d Svoben er meget kortere. 
Do 2 forreste Fodpar (Fig. 3 a) er af temmelig spinkel 
or »b men har Haanden forholdsvis stor og betydelig lsen- 
Ane end det foregaaende' Led. Den er noget udvidet mod 
'ulen, med Griberandcn meget skjrev og foran Midten for- 
Anet med et kort tandformigt Fremspring. Ved Enden af 
E''iberanden staar til hver Side en temmelig lang tynd Torn. 
De ovrige Fodpar er sterkt forhengede, men at tor- 
' olds vis kraftig Bygning, og besat med talrige Knipper at 
° rte Borster. Endekloen er meget krattig og leformigt 
kriunmet. Hofteleddet paa de 3 bagre Par er af oval 
°rm og i den bagre Kant tet saugtakket. 
Description. — The body (see PI. XIV, Fig. 3) some- 
what compressed from the sides, and less clumsy in struc- 
ture than in the forms referred to the genus Pleustes. The 
integuments, too, are much thinner and more approximately 
translucent. 
The head is comparatively small, and runs out an- 
teriorly in the middle as a short, but rather broad, down- 
ward-curving rostrum. The lateral margins constitute be- 
tween the points of attachment ol the 2nd pair of ante nine 
a narrowly rounded lobe, and are produced, posterior to the 
base of the 2nd pair, to a, sharp corner. 
All the thoracic segments and the 3 anterior abdom- 
inal ones, are distinctly keeled above along the median 
line, and furnished with high, compressed, dorsal projec- 
tions. Of these projections, the 3 anterior are less fully 
developed, and rounded at the extremity, whereas the fol- 
lowing 6 are very large, lanceolate, and directed posteriorly ; 
furthermore, the last, proceeding from the 3rd abdominal 
segment, is triangular-acute, and turns somewhat upward. 
The succeeding 3 abdominal segments are uniformly arched 
above, without either keel or projection. 
The 4 anterior pairs of epimera are rather high, but 
slender, and directed somewhat obliquely forward, with 
the posterior margin indistinctly crenulated. The 4th pair 
is the largest, and produced in the middle of the posterior 
margin to a sharp corner. The 3 posterior pail’s of epimera 
are considerably smaller and indistinctly bilobular. 
The lateral plates of the 3rd abdominal segment 
terminate posteriorly in a sharp, somewhat upward- bent 
point. 
The eyes are rather small, oval, or approximately 
reniform, with the anterior margin slightly incurved. Their 
pigment is of a reddish-yellow coloiu . 
The 1st pair of antennae are very greatly elongated, 
equalling about the whole body in length, and have the 
1st joint of the peduncle rather large, longer than the 2 
succeeding joints taken together. The flagellum is exceed- 
ingly slender, and composed of a large number of short 
articulations. 
The 2nd pair of antennae are scarcely half as long 
as the 1st, and have the peduncle about equal in length 
to that of the 1st pair, whereas the flagellum is much 
shorter. 
The 2 anterior pairs of legs (fig. 3 a) are rather 
slender in form, but have the hand comparatively large 
and much longer than the preceding joint. It is slightly 
dilated toward the extremity, with the palmar margin very 
oblique, and furnished, anterior to the middle, with a short, 
dentiform projection. At the end of the palmar margin, 
occurs on either side a rather long, slender spine. 
The remaining pairs of legs are greatly elongated, 
but comparatively powerful in structure, and beset with 
numerous tufts of short bristles. The terminal claw is 
verv strong, and falciform. The basal joint on each of the 
3 posterior pairs is oval in form and closely serrate along 
the posterior margin. 
De, 
uorsko Nordliavsexpedition. G. O. Sars: Crustacea. 
