41 



gelen af Frontalvedhæng hos Hannen, ved den meget 

 forskjellige Form af Hunnens Ægl.>eholder, endelig 

 ved betydelig kortere Halegrene. Betydelig storre 

 Affinitet liar den til Slægten Artrmia 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 iidprægede Cha- 

 racterer, saaledes ved den forskjellige Form af Han- 

 nens Gribeantenner og af Hunnens Ægbeholder, 

 endelig derved, at Halen har et Segment flere. Man 

 kj ender ialt med Sikkerhed herhen horende Arter, 

 nemlig, foruden den nedenfor nærmere beskrevne 

 arktiske Form, 2 nordamerikanske Arter: B. colora- 

 densis Packard og B. Lindahli Packard, en af Baird 

 fra Jerusalem beskreven Form, B. cxhnia, og to 

 russiske Arter fra Omegnen af Odessa, B. sphiosa 

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

 Art, som den russiske Naturforsker Schmankewitch 

 troede at se forvandlet til en Arteniia ved paa kiin- 

 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. 



Brancliinecta paliidosa (Muller). 



(Pl. VI, VII, VIII), 



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

 Brancliipus paludoaus, JMiiller, Zool. Danica II, 10, Pl. 48, 



Fig. 1—8. 

 Braiiclupus viiddciidorfianns, Fi.scher, Middendorf s Sibirisohe 



Reisen, Bd. II, p. 163, PI. VII, Fig. 17—23. 

 Branchhiccta gronlandica, Verrill, Amer. Journ. fgc. 1869, p. 253. 

 Branchinccta arctirn, Idem, ibid. 



Artscharacteristik. Legemets Form slank og 

 elegant, med de 3 Kropsafsuit vel markerede. Ho- 

 vedet af middelmaadig Størrelse, jevnt afrundet for- 

 til hos begge Kjøn. Halen betydelig længere end 

 den foranliggende Del af Legemet, smalt cj'lindrisk, 

 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 Folere hos Hunnen næsten af Hovedets Længde, 

 meget skraat afskaarne i Enden, med det bagre 

 Hjorne udtrukket i en skarp Spids. Samme Følere 

 hos Hannen mere end dobbelt saa lange, Skaftet 

 noget krummet ved Basis, tykt cylindriskt, med en 

 E,ad af smaa Tænder langs den indre Kant; Ende- 

 delen lidt kortere, noget boiet paa Midten og jevnt 

 afsmalnende mod Spidsen, som er stumpt tilrundet. 

 Branchialfodderne med Endopoditens ydre Lap hos 



6 — G. 0, Sårs; Fauna Xorvegiic. 



by the absence of frontal appendages in the male, 

 by the verj' different shape of the marsupium of the 

 female, and, iinally, 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 (J species, altogether, pertaining hereto, namelj', 

 besides the Arctic form more particularly described 

 below, 2 North American species ; B. coJoradensis, 

 Packard, and B. LindaJdi, 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 Arlemia, 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. 



Branehinecta i>alii(losa (Milller). 



(PI. VI, VII, VIII). 



Cancer sfac/nalis, Fabr., Fauna gronlandica. No. 224 (non Linné). 

 BrancMpHS pnludosus, Mliller, Zool. Danica U, 10, PI. 48, 



figs 1—8, 

 Bra>icJiipi(s middcndorfianits, Fischer, Middendorf' s Sibirische 



Reisen. Bd. II, p. 163, PI. VII, flgs. 17—23. 

 Branehinecta gronlandica, Verrill, Amer. Journ, Sc, 18C9, ii. 263. 

 Branehinecta arctica, Idem, ibid. 



Specific characteristics. Form of body slender 

 and elegant, with the o body-divisions well mar- 

 ked off. Head of moderate size, evenlj' 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 tiie 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 tlie extremity, with 

 the posterior corner drawn out to a shai'p 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 part a. little shorter, somewhat curved in 

 the middle, and narrowing evenly towards the point. 



