58 



Fam. 2. Polyartemiidæ. 



Legemet slankt, med Halen kort og ixfuldkom- 

 ment segmenteret lios Hnnnen, (Ti'il)eantennerne 

 hos Hannen iileddede, og delte i tiere hageformigt 

 krummede Grene ; Frontalvedhæng tilstede. 1 9 Par 

 Brancliialfndder, alle, imdtagen sidste Par, med dob- 

 delt Ba.salplade. Hunnens Ægbeholder kort og tyk, 

 ikke poseformigt fremragende bagtil. Hannens ydi'e 

 Kjonsvedliæng dobbelte. Halegrenene korte, blad- 

 formige, kantede med cilierede Bor.ster. 



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 betj^delig storre 

 Antal Segmenter i Forkrojjpen og det deraf folgende 

 forogede Antal Brancliialfodder ; fremdele.s Halens 

 Structur og Ægbeholderens Form hos Hunnen ; ende- 

 lig Gribeantennernes eiendommelige Bygning hos 

 Hannen. 



6en. Polyartemia, Fischer, is.51. 



Slsegtscharacter. — Legemet næsten lyliudriskt 

 og meget hoieligt. Kjønsringene 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; 

 Frontalvedhængene simpelt cylindriske. Branchial- 

 fodderne forholdsvis brede og af samme Udseende 

 li os de 2 Kjon, Exopoditen forholdsvis liden, oval, 

 den ydre Lap af Endopoditen stumpt afrundet i 

 Enden, begge Basal plader helrandede. Hunnens 

 Ægbeholder stærkt opblæst fortil. 



Bemærkninger. — Nærværende Slægt er opstil- 

 hr-t i Aaret 1851 af Fischer og væsentlig eharac- 

 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 oj).stilles som Typen fVir 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 ])rojecting posterioi'ly like a 

 bag. External sexual appendage of male double. 

 Caiidal 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 chietiy distingnishes 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 

 jieeuliar formation of the prehensile antennæ in 

 tlie male. 



Gen. Polyartemia, iis(her i85i. 



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 antennæ 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 

 laminæ plain. Marsujiium of the female very much 

 inflated in front. 



Remarks. — The present genus was established 

 in iSol by Fischer, and is chiefly cliaracterized by 

 the unusually large number of Ijranchial legs. As 

 it (lifters in this respect fmm all other Branchijio- 

 didæ, where the uumlier 11 is t[uite invariable, it 

 witliout doubt merits being established as the type 

 of a separate family. The genus contains at ])re- 

 sent only a single species, which will he more fully 

 described lielow. 



