Fam. 2. Polyartemiide. 
Legemet slankt, med Halen kort og ufuldkom- 
ment segmenteret hos Hunnen. Gribeantennerne 
hos Hannen uleddede, og delte i flere hageformigt 
krummede Grene; Frontalvedheng tilstede. 19 Par 
Branchialfodder, alle, undtagen sidste Par, med dob- 
delt Basalplade. Hunnens Agbeholder kort og tyk, 
ikke poseformigt fremragende bagtil. Hannens ydre 
Kjonsvedheng dobbelte. Halegrenene korte, blad- 
formige, kantede med cilierede Borster. 
Bemerkninger. — Af denne Familie kjendes 
hidtil kun en enkelt Slegt, Polyartemia, med en en- 
kelt Art. Hvad der hovedsageligt skiller denne Fa- 
milie fra den foregaaende, er det betydelig storre 
Antal Segmenter i Forkroppen og det deraf folgende 
foregede Antal Branchialfodder; fremdeles Halens 
Structur og Agbeholderens Form hos Hunnen; ende- 
lig Gribeantennernes eiendommelige Bygning hos 
Hannen. 
Gen. Polyartemia, Fischer, 1851. 
Slegtscharacter. — Legemet nesten cylindriskt 
og meget boieligt. Kjonsringene hos Hunnen sam- 
menvoxne med Halen; denne sidste hos Hunnen med 
kun et enkelt terminalt Segment, hos Hannen tydeligt 
6-leddet Halegrenene forholdsvis korte. Hannens 
Gribeantenner 3-delte, den forreste Gren  storst; 
Frontalvedhengene simpelt cylindriske. Branchial- 
fodderne forholdsvis brede og af samme Udseende 
hos de 2 Kjon, Exopoditen forholdsvis liden, oval, 
den ydre Lap af Endopoditen stumpt afrundet i 
Enden, begge Basalplader helrandede. Hunnens 
Egbeholder sterkt opblest fortil. 
Bemerkninger. — Nerverende Slegt er opstil-. 
let i Aaret 1851 af Fischer og vesentlig charac- 
teriseret ved det ualmindelig store Antal Branchial- 
fodder. Da denne Slegt i saa Henseende skiller 
sig fra alle andre Branchipodider, hos hvem Tallet 
11 er fuldkommen constant, fortjener den utvivlsomt 
at opstilles som Typen for en egen Familie. Sleg- 
ten indeholder for Tiden kun en enkelt Art, som 
nedenfor nermere skal beskrives. 
58 
Fam. 2. Polyartemiide. 
Body slender, with a short and imperfectly 
segmented tail in the female. Prehensile antenne 
in male inarticulate and divided into several claw- 
like rami: frontal appendages present. Nineteen 
pairs of branchial legs, all, except the last pair, 
with double basal lamine. Marsupium of female 
short and thick, not projecting posteriorly like a 
bag. External sexual appendage of male double. 
Caudal rami short and laminar, edged with ciliated 
bristles. 
Remarks. — Only one genus of this family is 
known up to the present, Polyartemia, with a single 
species. What chiefly distinguishes this family from 
the preceding one is the much larger number of 
segments in the anterior part of the body, and the 
consequent augmented number of branchial legs; 
furthermore, the structure of the tail, and the shape 
of the marsupium in the female, and lastly, the 
peculiar formation of the prehensile antenne in- 
the male. 
Gen. Polyartemia, Fischer. 1851. 
Generic characters. — Body almost cylindrical 
and very flexible. Genital segments in female co- 
alesced with the tail; the latter, in the female, 
with a single terminal segment only, in the male 
distinctly 6-articulate. Caudal rami comparatively 
short. Prehensile antenne of male divided into 
three curved rami, the foremost being the lar- 
gest; frontal appendages of a simple cylindrical 
shape. Branchial legs comparatively broad, and of 
a similar appearance in the two sexes; exopodite 
oval and comparatively small; external lobe of the 
endopodite bluntly rounded at the end: both basal 
laminee plain. Marsupium of the female very much 
inflated in front. 
Remarks. — The present genus was established 
in 1851 by Fischer, and is chiefly characterized by 
the unusually large number of branchial legs. As 
it differs in this respect from all other Branchipo- 
did, where the number 11 is quite invariable, it 
without doubt merits being established as the type 
of a separate family. The genus contains at pre- 
sent only a single species, which will be more fully 
described below. 
—_.. 4 
a iy 
