58 



Fam. 2. Polyartemiidæ. 



Legemot slankt, med Halen kort og- nfuldkoni- 

 meiit segmenteret hos Hunnen. Gi-ihean tennerne 

 hos Hannen uleddede, og delte i Here hageformigt 

 krummede Grene; Frontalvedhæng tilstede. 19 Par 

 Braneliiallodder, alle, undtagen sidste Par, med dob- 

 delt Basalplade. Hunnens Ægbeholder kurt og tyk, 

 ikke poseformigt fremragende bagtil. Hannens 3'dre 

 Kjonsvedhæng dobbelte. Halegrenene korte, blad- 

 formige, kantede med eilierede Borster. 



Bemærkninger. — Af denne Familie kjendes 

 hidtil kun en enkelt Slægt, 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 følgende 

 forogede Antal Branehialfodder ; fremdeles Halens 

 Structur og Ægbeholderens Form hos Hunnen; ende- 

 lig G-ribeantennerne.s eiendommelige Bygning hos 

 Hannen. 



Gen. Polyartemia, Fischer, is5i. 



Slægtscharacter. — Legemet næsten 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 forre.ste Gren storst; 

 Frontalvedhængene simpelt cylindriske. Branehial- 

 foddei'ne forholdsvis brede og af samme Udseende 

 hos de 2 Kjon, Exopoditen forholdsvis liden, oval, 

 den ydre Lap af Endo^Doditen stumpt afrundet i 

 Enden, begge Basalplader helrandede. Hunnens 

 Ægbeholder stærkt opblæst fortil. 



Bemærkninger. — Nærværende Slægt er opstil- 

 let i Aaret 18;")! af Fischer og væsentlig charac- 

 teriseret ved det ualmindelig store Antal Branchial- 

 fodder. Da denne Slægt i saa Henseende skiller 

 sig fra alle andre Branchipodider, hos hvem Tallet 

 11 er fuldkommen constant, fortjener den utvivlsomt 

 at opstill(>s som Ty])en for en egen Familie. Slæg- 

 ten indeholder for Tiden kun en enkelt Art, som 

 nedenfor nærmere skal l>esk)'ives. 



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 Imsal laminæ. Marsupium of female 

 short and thick, not ])rojecting posteriorly like a 

 bag. External sexiial appendage of male double. 

 Caudal rami short and laminar, edged with ciliated 

 bristles. 



Remarks. — "uly one genus of this family is 

 known up to the present, Folyartemia. with a single 

 species. What chiedy distinguishes this family from 

 the preceding one is the much larger number of 

 segments in the anterior part of the body, and the 

 conse([uent augmented number of branchial legs; 

 furthermore, the striTcture 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 i85L 



Generic characters. — Bodj' almost cylindrical 

 and veiy 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. ("audal rami comparatively 

 short. Prehensile antennæ of male divided into 

 three curved rami, tlie 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 

 laminæ plain. Marsupium of the female wvy niunh 

 inflated in front. 



Remarks — The ])resent genus was established 

 in l.'^.")! by Fischer, and is chiefly characterized by 

 the nnnsuall\- large nund)er of In'anchial legs. As 

 it (litters in this respect from all other Branchipo- 

 didæ, where the number I 1 is (|uite invariable, it 

 witlii'ut doubt merits being establishe(l as the type 

 of a separate family. The giMUis contains at pre- 

 sent only a single sjtecies. which will he more fully 

 described below. 



