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Fam. 1. Branchipodidæ. 



Character. Legemet smalt cylindriskt. noget 

 tykkere fortil, med Halen vel ndviklet og tydeligt 

 segmenteret hos begge Kjon, endende med 2 borste- 

 besatte Halegrene. Hannens Gribeantenner tydeligt 

 segmenterede og i Regelen forsynede med en rudi- 

 mentære Bigren. Frontalvedliæng tilstede hos Han- 

 nen eller manglende. 11 Par Branchialfødder til- 

 stede, alle med en enkelt sagtakket ydre Dæk])lade. 

 Hunnens Ægbeholder tydeligt sækformig og bagud- 

 rettet, udspringende fra de 2 forreste Halesegmenter. 



Bemærkninger. Til denne Familie hører ialt 

 5 Slægter, nemlig: Artemla Leacli, Branchinecfa, 

 Verrill, BrancJupns Schatfer, Chiroeephahis Prevost 

 og Streptocephalas Baird. Kun en af disse Slægter, 

 BrancJiinectd, er repræsenteret i vor Fauna. Fami- 

 lien er hovedsageligt characteriseret ligeoverfor den 

 følgende Familie, I'oli/ar/emiirJce, ved den forskjellige 

 Bygning af Hannens Gribeantenner, ved det bety- 

 delig ringere Antal Branchialfødder, ved Halens 

 Form, endelig ved Beskaffenheden af Hunnens Ægge" 

 beholder. Fra Familien Tamnocephalidce, med hvem 

 den kommer overens i Antallet af Branchialfødder, 

 skiller den sig ved Legemets smækrere Form o"- 

 navnlig ved Beskaffenheden af Halen. 



Gen. Branchinecta, VerriU, 1869. 



Syn: Branchipiis, Mihie-Edw. (e.r parte). 



Slægtscharacter. Legemet af særdeles slank 

 Form, med Halen tynd og forlænget, bestaaende af 

 9 Segmenter, foruden Halegrenene; de sidste for- 

 holdsvis korte. Hannens Gribeantenner simple, be- 

 staaende af et tykt cylindriskt Skaft og en smal, 

 kloformig, indadkrummet Endedel; Bigrenen meget 

 liden, knudeformig. Ingen Frontalvedhæng tilstede. 

 Branchialfødderne forholdsvis brede, med Exopoditen 

 af afrundet oval Form, og den ydre Dækplade sag- 

 takket i Kanterne. Hunnens Æggebeholder særdeles 

 smal og forlænget, næsten cylindrisk. 



Bemærkninger. Denne af den amerikanske For- 

 sker, Prof. Verrill, opstillede Slægt er væsentlig 

 characteriseret ligeoverfor Sl. BrancUpus Schaffer 

 ved den overordentlig slanke Kropsform, ved Man- 



Fam. I. Branchipodidæ. 



Character. Body narrow cylindrical, somewhat 

 thicker in front, with the tail well developed and 

 distinctly segmented in both sexes, terminating in 

 2 bristle-beset caudal rami. Prehensile antennæ of 

 the male distinctly segmented, and usually furnished 

 with a rudimentary sub-branch. Frontal appendages 

 present in the male or awanting. 11 pairs of 

 branchial feet present, all having a single serrated 

 external covering plate. Marsupium of the female 

 distinctly sac-formed, directed backwards, and issuing 

 from the 2 foremost caudal segments. 



Remarks. Five genera in all pertain to this 

 family, namely : Arfemia, Leach ; Branchinecfa, Verrill ; 

 Brancliipus, Schaeffer; ChirocepJialus, Prevost, and 

 Strepioceplialuf;, Baird. Only one of these genera, 

 Brnnchinectu, is represented iu our fauna. The 

 family is principally characterised, in contrast with 

 the following family PoJi/arfemiidce. by the different 

 structure of the prehensile antennæ of the male, by 

 the considerably smaller number of branchial feet, 

 by the shape of the tail and, finally, by the cha- 

 racter of tlie marsupiiim in the female. It distingu- 

 ishes itself from the family Tamnoceplialidæ, with 

 which it agrees in the number of branchial feet, 

 by the more slender form of the body, and espe- 

 cially in the character of the tail. 



Gen. Branchinecta, Verrill, 1869. 



Syn: Brancliipus, Ulilne-Edw. {ex parte). 



Generic characters. Body of particularly slen- 

 der shape, with the tail slender and prolonged, 

 consisting of 9 segments besides the caudal rami; 

 the last named relatively short. Prehensile an- 

 tennæ of the male simple, consisting of a thick, cyl- 

 indrical shaft, and a narrow, claw-shaped, incurved 

 terminal part; the sub-branch very small, nodiform. 

 Na frontal appendage present. Branchial feet re- 

 latively broad, with the exopodite of rounded oval 

 form and the outer covering plate serrated on 

 the edges. Marsupium of the female particularly 

 narrow and elongated, almost cylindrical. 



Remarks. This genus, established by the Ame- 

 rican naturalist, Prof. Verrill, is chiefly characteri- 

 sed, in contrast with the gen. Branehipus, Schiiffer, 

 by the extraordinarily slender shape of the body, 



