4 
gelen af Frontalvedheng hos Hannen, ved den meget 
forskjellige Form af Hunnens Aigheholder, endelig 
ved betydelig kortere Halegrene. Betydelig storre 
Affinitet har den til Slegten Artemia Leach, med 
hvilken den stemmer overens baade i Henseende til 
den almindelige Habitus og ved Mangelen af Frontal- 
vedheng hos Hannen. Den skiller sig imidlertid 
ogsaa fra denne Slegt ved visse vel udpregede Cha- 
racterer, sauledes ved den forskjellige Form af Han- 
nens Gribeantenner og af Hunnens Agbeholder, 
endelig derved, at Halen har et Segment flere. Man 
kjender ialt med Sikkerhed 6 herhen horende Arter, 
nemlig, foruden den nedenfor neermere beskrevne 
arktiske Form, 2 nordamerikanske Arter: B. colora- 
densis Packard og B. Lindahli Packard, en af Baird 
fra Jerusalem beskreven Form, B. eximia, og to 
russiske Arter fra Omegnen af Odessa, B. spinosa 
M. Edw. og B. feror M. Edw. Det var denne sidste 
Art, som den russiske Naturforsker Schmankewitch 
troede at se forvandlet til en Artemia ved paa kun- 
stig Maade at domesticeres i saltholdigt Vand, noget 
der vel egentlig er at forstaa saaledes, at Arten 
under de forandrede Forhold antog visse Charac- 
terer, der mindede om ovennevnte Slegt. 
Branchinecta paludosa (Miiller). 
(Pl. VI, VII, VIII). ° 
Cancer stagnalis, Fabr., Fauna gronlandica, No. 224 (non Linné). 
Branchipus paludosus, Miller, Zool. Danica II, 10, Pl. 48, 
Fig. 1—8. 
Branchipus middendorfianus, Fischer, Middendorf's Sibirische 
Reisen, Bd. II, p. 153, Pl. VII, Fig. 17--2% 
Branchinecta gronlandica, Verrill, Amer. Journ. Se. 1869, p. 253. 
‘Branchinecta arctica, Idem, ibid. 
Artscharacteristik. Legemets Form slank og 
elegant, med de 3 Kropsafsnit vel markerede.  Ho- 
vedet af middelinaadig Storrelse, jevnt afrundet for- 
til hos begge Kjon. Halen betydelig lengere end 
den foranliggende Del af Legemet, smalt cylindrisk, 
med nestsidste Segment det. lengste, og sidste Seg- 
ment omtrent halvt saa langt. Halegrenene nesten 
dobbelt saa lange som sidste Segment, smalt lancet- 
formige og tet kantede med cilierede Borster. 2det 
Par Folere hos Hunnen nesten-.af Hovedets Lengde, 
meget skraat afskaarne i Enden, med det bagre 
Hjorne udtrukket i en skarp Spids. Samme Folere 
hos Hannen mere end dobbelt saa lange, Skaftet 
noget krummet ved Basis, tykt cylindriskt, med en 
Rad af smaa Tender langs den indre Kant; Ende- 
delen lidt kortere, noget boiet paa Midten og jevnt 
afsmalnende mod Spidsen, som er stumpt tilrundet. 
Branchialfodderne med Endopoditens ydre Lap hos 
6 — G. 0. Sars: Fauna Norvegiz. 
41 
by the absence of frontal appendages in the male, 
by the very different shape of the marsupium of the 
female, and, finally, by considerably shorter caudal 
rami. It has much greater affinity to the genus 
Artemia, Leach, with which it agrees, both in regard 
to the general habitus and in the absence of frontal 
appendages in the male. It distinguishes itself, how- 
ever, also from that genus by certain well marked 
characteristics; thus, by the different form of the 
prehensile antenne of the male and of the mar- 
supium in the female, and, finally, in the tail hav- 
ing an additional segment. We know with certainty 
of 6 species, altogether, pertaining hereto, namely, 
besides the Arctic form more particularly described 
below, 2 North American species: B. coloradensis, 
Packard, and B. Lindahli, Packard; a form from 
Jerusalem, described by Baird, B. eximia; and 2 
Russian species from the neighbourhood of Odessa, 
B. spinosa, M. Edw. and B. ferox M. Edw. It was 
the last named species that the Russian naturalist 
Schmankewitch believed to have seen transformed 
to an’ Artemia, by being, in an artificial manner, do- 
mesticated in water containing salt; a fact which 
may be more properly understood in this manner, 
viz. — that the species, under the changed relations, 
assumed certain characters which reminded of the 
above-named genus. 
Branchinecta paludosa (Miiller). 
(Pl. VI, VII, VII). 
Cancer stagnalis, Fabr., Fauna gronlandica, No. 224 (non Linné). 
Branchipus paludosus, Miller, Zool. Danica II, 10, Pl. 48, 
figs 1—8. 
Branchipus middendorfianus, Fischer, Middendorf'’s Sibirische 
Reisen, Bd. Il, p. 153, Pl. VII, figs. 17—23. 
Branchinecta grgnlandica, Verrill, Amer. Journ. Se. 1869, p. 253. 
Branchinecta arctica, Idem, ibid. 
Specific characteristics. Form of body slender 
and elegant, with the 3 -body-divisions well mar- 
ked off. Head of moderate size, evenly rounded in 
front in both sexes. Tail considerably longer 
than the part of the body lying in ‘front of it, 
narrow cylindrical, with the penultimate segment 
the longest, and the last segment about half as 
long. Caudal rami almost twice as long as the 
last segment, narrow lanceolate in shape, and closely 
edged with ciliated bristles. Second pair of an- 
tenn, in female, almost the length of the head, 
very obliquely truncated at the extremity, with 
the posterior corner drawn out to a sharp point. 
Same antenne in male more than twice as long; 
shaft somewhat curved at the base, thick cylindrical, 
with a series of small teeth along the inner edge; 
terminal part a little shorter, somewhat curved in 
the middle, and narrowing evenly towards the point, 
