41 



gelen af Frontalvedliæng lios Hannen, ved den meget 

 forskjellige Form af Hunnens Ægbeholder, endelig 

 ved betydelig kortere Halegrene. Betydelig større 

 Affinitet har den til Slægten Arfemia Leach, med 

 hvilken den stemmer overens baade i Henseende til 

 den almindelige Habitus og ved Mangelen af Frontal- 

 vedhæng hos Hannen. Den skiller sig imidlertid 

 ogsaa fra denne Slægt ved visse vel udprægede Cha- 

 racterer, saaledes ved den forskjellige Form af Han- 

 nens Gribeantenner og af Hunnens Ægbeholder, 

 endelig derved, at Halen har et Segment flere. Man 

 kjender ialt med Sikkerhed 6 herhen hørende Arter, 

 nemlig, foruden den nedenfor nærmere beskrevne 

 arktiske Form, 2 nordamerikanske Arter: B. eolora- 

 densis Packard og B. LindaJili Packard, en af Baird 

 fra Jerusalem beskreven Form, B. eximia, og to 

 russiske Arter fra Omegnen af Odessa, B. spinosa 

 M. Edw. og B. ferox M. Edw. Det var denne sidste 

 Art, som den russiske Naturforsker Sehmankewitch 

 troede at se forvandlet til en Arfemia ved paa kun- 

 stig Maade at domesticeres i saltholdigt Vand, noget 

 der vel egentlig er at forståa saaledes, at Arten 

 linder de forandrede Forhold antog visse Charac- 

 terer, der mindede om ovennævnte Slægt. 



Branchinecta palndosa (Muller). 



(Pl. VI, VII, VIII). 



Cancer stagnalis, Fabr., Fauna grønlandica, No. 224 (non Linné). 

 BranMpus paludosus, jNIuller, Zool. Danica II, 10, Pl. 48, 



Fig. 1—8. 

 Branchipus middendorfianus, Fischer, Middendorfs Sibirische 



Reisen, Bd. II, p. 153, Pl. VII, Fig. 17—23. 

 Branchinecta grønlandica, Verrill, Amer. Journ. Sc. 1869, p. 263. 

 Branchinecta arctica, IderOj ibid. 



Artscharacteristik. Legemets Form slank og 

 elegant, med de 3 Kropsafsnit vel markerede. Ho- 

 vedet af middelmaadig Størrelse, jevnt afrundet for- 

 til hos begge Kjon. Halen betydelig længere end 

 den forauliggende Del af Legemet, smalt cylindrisk, 

 med næstsidste Segment det længste, og sidste Seg- 

 ment omtrent halvt saa langt. Halegrenene næsten 

 dobbelt saa lange som sidste Segment, smalt lancet- 

 formige og tæt kantede med cilierede Borster. 2det 

 Par Følere hos Hunnen næsten af Hovedets Længde, 

 meget skraat afskaarne i Enden, med det bagre 

 Hjørne udtrukket i en skarp Spids. Samme Følere 

 hos Hannen mere end dobbelt saa lange, Skaftet 

 noget krummet ved Basis, tykt cylindriskt, med en 

 Ead af smaa Tænder langs den indre Kant; Ende- 

 delen lidt kortere, noget boiet paa Midten og jevnt 

 afsmalnende mod Spidsen, som er stumpt tilrundet. 

 Branchialfødderne med Endopoditens ydre Lap hos 



6 — G. 0. Sårs: Fauna Korvegiæ. 



by the absence of frontal appendages in the male, 

 by the very diflFerent 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 antennæ 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. cohradensis, 

 Packard, and B. Lindahli, Packard; a form from 

 Jerusalem, described by Baird, B. exiniia; 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 

 Sehmankewitch 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 palndosa (Mitller). 



(PI. VI, VII, VIll). 



Cancer stagnalis, Fabr., Fauna gronlandica. No. 224 (non Linné). 

 Branchipus jmlicdosus, Miiller, Zool. Danica II, 10, PI. 48, 



figs 1—8. 

 Branchipus middendorfianus, Fischer, Middendorfs Sibirische 



Reisen, Bd. H, p. 153, PI. VII, figs. 17—28. 

 Branchinecta grønlandica, Verrill, Amer. Journ. Sc. 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- 

 tennæ, 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 antennæ 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 jjart a little shorter, somewhat curved in 

 the middle, and narrowing evenly towards the point. 



