58 



Fam. 2. Polyartemiidæ. 



Legemet slankt, med Halen kort og nfuldkom- 

 meiit segmenteret hos Hunnen. Gribeantennerne 

 hos Hanneji nleddede, og delte i flere hageformigt 

 krummede Grene; Frontalvedhæng tilstede. 19 Par 

 Branchialfodder, alle, undtagen sidste Par, med dob- 

 delt Basalplade. Hnnnens Ægbeholder kort og tyk, 

 ikke poseformigt fremragende bagtil. Hannens ydre 

 Kjønsvedhæng dobbelte. Halegrenene korte, blad- 

 formige, kantede med eilierede Borster. 



Bemærkninger. — Af denne Familie kjendes 

 hidtil kun en enkelt 81ægt, Poh/arteniia, 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 følgende 

 forogede Antal Branchialfodder; fremdeles Halens 

 Structur og ÆgbeholderensForm hosHiinnen; ende- 

 lig Gribeantennernes eiendommelige Bygning hos 

 Hannen. 



Gen. Polyartemia, Fischer, isoi. 



Slægtscharacter. — Legemet næsten cylindriskt 

 og meget boieligt. Kjønsringene hos Hunnen sam- 

 men voxne 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 størst; 

 Frontalvedhængene simpelt eylindriske. Branchial- 

 fodderne forholdsvis brede og af samme Udseende 

 hos de 2 Kjon, Exopoditen forholdsvis liden, oval, 

 den ydre Lap af Endopoditen stumpt alrandet i 

 Enden, begge Basalplader helrandede. Himnens 

 Ægbeholder stærkt of)blæst fortil. 



Bemærkninger. — Nærværende Slægt er opstil- 

 let i Aaret 1851 af Fischer og væsentlig cliarac- 

 teriseret ved det ualmindelig store Antal Branchial- 

 fodder. Da denne Slægt i saa Henseende skiller 

 sig fra alle andre Bi'anchipodider, hos hvem Tallet 

 11 er fuldkommen constant, fortjener den ntvivlsomt 

 at opstilles som Typen for en egen Familie. Slæg- 

 ten indeholder for Tiden kun en enkelt Art, som 

 nedenfor nærmere skal beskrives. 



Fam. 2. Polyartemiidæ. 



Body slender, with a short and imperfectly 

 segmented tail in the female. Prehensile antennæ 

 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 laminæ. Marsupium of female 

 short and thick, not projecting posteriorly like a 

 bag. External sexual apjjendage of male double. 

 Caudal rami short and laminar, edged with ciliated 

 bristles. 



Remarks. — Only one genus of this family is 

 known \i\) 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 

 conseqvient 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 antennæ. in 

 the male. 



Gen. Polyartemia, Fischer i85i. 



Generic characters. — Body almo.st cylindrical 

 and very flexible, (xenital 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 com2)aratively 

 short. Prehensile antennæ of male divided into 

 three ciirved 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 tlie 

 endopodite bluntly rounded at the end: both basal 

 laminæ plain. Marsupium of the female ver\' much 

 inflated in front. 



Remarks. — Tlie 2)resent genus was e.stablished 

 in 1851 by Fischer, and is chiefl}' characterized by 

 the unusually large niimber of branchial legs. As 

 it (Hfl'ers in this respect from all other Branchipo- 

 didæ, where the number 11 is quite invariable, it 

 witho\;t doulit merits being established as the type 

 of a seiwrate family. The genus contains at pre- 

 sent only a single species, which will be more fully 

 described below. 



