41 



gelen af Fi'ontalvedLæng hos Hannen, ved den meget 

 forskjellige Form af Hunnens Ægbeholder, endelig 

 ved betydelig kortere Halegrene. Bet3^delig storre 

 Affinitet har den til Slægten Arfemia Leach, med 

 hvilken den stemmer overens baade i Henseende til 

 den almiudelige Habitus og ved Mangelen af Frontal- 

 vedliæng 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 (J herhen hørende Arter, 

 nemlig, foruden den nedenfor nærmere beskrevne 

 arktiske Form, 2 nordamerikanske Arter: B. rolora- 

 demis Packard og B. Lindaldi Packard, en af Baird 

 fra Jerusalem beskreven Form, li. eximia, og to 

 russiske Arter fra Omegnen af Odessa, B. spinom 

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

 Art, som den russiske Naturforsker Sciimankewitch 

 troede at se forvandlet til en Artemia ved paa kun- 

 stig Maade at domesticeres i saltholdigt Vand, noget 

 der vel egentlig er at forståa saaledes, at Arten 

 under de forandrede Forhold antog visse Charac- 

 terer, der mindede om ovennævnte Slægt. 



Braiicliineeta paliidosa Muller). 



(11. VI, VII, VIII). 



Cancer stagnalis, Fabr., Fauna gronlandica, Xo. 224 (nou Linné). 

 Branchipus paludosust Miiller, Zool. Danica II, 10, Pl. 48, 



Fig. 1-8. 

 Branchijmn middendorfianws, Fischer, Middendorf s Sibirische 



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

 Branchineda gronlandica, Verrill, Amer. Journ. Sc. 18G9, p. 253. 

 Brancldnccta urciira, Idem, ibid. 



Artscharacteristik. Legemets Form slank og 

 elegant, med de o Kropsafsnit vel markerede. Ho- 

 vedet af middelmaadig Størrelse, jevnt afrundet for- 

 til hos begge Kjon. Halen betydelig længere end 

 den foranliggende 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 tiPt kantede med cilierede Horster. 2det 

 Par Følere hos Hunnen næsten af Hovedets Længde, 

 meget skraat afskaai'ne i Enden, med det bagre 

 Hjørne udtrukket i en skarp Spids. Samme Fulere 

 hos Hannen mere end dobbelt saa lange. Skaftet 

 noget krummet ved Basis, tykt cj-lindriskt, med en 

 Rad af smaa Tænder langs den indre Kant; Ende- 

 delen lidt kortere, noget boiet paa Midten og jevnt 

 afsmalnende mod Spidsen, som er stumpt tilrundet. 

 Braneliialfodderne med Endopoditens ydre Lap hos 



6 — G. 0. Sårs: Fauna Xorvegiif. 



by the absence of frontal appendages in the male, 

 by the ver}' different shape of the marsupium of the 

 female, and, finally, by considerably shorter caudal 

 rami. It has much greater affinity to the genus 

 Arfemia, 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, b}' 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 (i species, altogether, pertaining hereto, namel}', 

 besides the Arctic form more particularly described 

 below, 2 North American species: B. coloradensis, 

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

 Jerusalem, described by Baird, B. eximia; 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 

 Schmankewitch believed to have seen transformed 

 to an Artemia, bj' 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. 



Braiiehinecta paliitlosa (Miiller). 



(PI. VI, VU, VIlIj. 



Cancer utognalis, Fabi-., F'auna gronlandica, No. 224 (non Linné). 

 Branchipus ^^n/Mf/osws, Miiller, Zool. Danica II, 10. PI. 48, 



figs 1-8. 

 Branchipus middcndorfianus, Fischer, ^liddendorf's Sibirische 



Keisen. Bd. U, p. 153, I'l. VU, figs. 17—23. 

 Branchinccta gronlandica, Verrill, Amer. Journ. Sc. 1869, p. 253. 

 Branchinecta arctica, Idem, ibiil. 



Specific characteristics. Form of body slender 

 and elegant, with the l> budy-divisions well mai'- 

 ked off. Head of moderate size, evenly rounded in 

 front in both sexes. Tail considerably longer 

 than the ])art 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 closel}' 

 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 shai'p point. 

 Same antennæ in male more than twice as long: 

 shaft somewiiat curved at the base, thick cylindrical, 

 with a series of small teeth along the inner edge; 

 terminal ])art a little shorter, somewhat curved in 

 the middle, and narrowing evenh- towards the point. 



