Polyartemia forcipata, [ischer. 
(Pl. IX & X). 
Polyartemia forcipata, Vischer, Middendorff’s Sibirische Reise, 
Bd. 2. Zoologie, p. 154, Tab. VII, Fig. 24—28. 
Artscharacter. — Legemet smalt cylindriskt, 
nesten jeynt tykt hos Hunnen, noget afsmalnende 
bagtil hos Hannen. Hovedet hos Hunnen forholds- 
vis lidet og afrundet fortil, hos Hannen betydelig 
bredere og endende med 2 stumpt coniske, nedad- 
krummede Frontalfortsatser. Halen og Kjonsringene 
tilsammen neppe mere end halvt saa lang som den 
fodbwrende Del af Kroppen. Hunnens Agbeholder 
bredt afrundet fortil med et knudeformigt Frem. 
spring til hver Side. Hannens ydre Kjonsvedheng 
simpelt cylindriske og omtrent af Halens halve 
Lengde. Q@inene kolleformige, omtrent af Lengde 
som Hovedets halve Tverdiameter. Forste Par Fo- 
lere forholdsvis smaa, kortere end Minene. Andet 
Par Folere hos Hunnen betydelig kortere end Ho- 
vedet, endende i en trianguler Flig; samme Folere 
hos Hannen serdeles store, tregrenede, de 2 forreste 
Grene tangformigt krummede i Enden og fint cili- 
erede i den indre Kant, den bagerste Gren kort, 
lige nedad rettet og tet haaret i-Enden. Hale- 
pladerne bredt lancetformige, omtrent dobbelt saa 
lange som de ér brede ved Basis. Legemet gjennem- 
sigtigt med svagt gronligt, blaaligt eller rodligt 
Skjer. Hannen sedvanlig lys gulagtig. Hunnens 
_ Kjonsringe oventil med 2 ultramarinblaa kantede 
Pletter, mellem hvilke er 2 smale Striber af samme 
Farve, Mgbeholderen orangefarvet nedentil. Hun- 
nens Lengde indtil 16 mm, Hannens 10 mm. 
Bemerkninger. — Denne eiendommelige Phyllo- 
pode blev forst opdaget under Middendorffs Reise i 
Sibirien og er kortelig beskrevet under ovenstaaende 
- Navn af 8. Fischer, sammen med andre under Rei- 
sen indsamlede Entomostraceer. Den er senere 
_ ogsaa gjenfunden af andre Forskere, uden at dog 
- endnu nogen mere udforlig Beskrivelse er leveret. 
Beskrivelse af Hunnen. 
Lengden af Legemet, fra Panderanden til Enden 
af Halebladene, naar op til 16mm. Dog finder man 
den, saaledes som Tilfeldet er med andre Phyllo- 
poder, slegtsmoden lenge for den har naaet denne 
se. ‘ 
Legemet er (se Tab. IX, Fig. 1 og 2) slankt, 
eylindriskt, og nesten af ens Bredde, dog hos fuldt 
_ udviklede Individer kjendeligt opsvulmet. bagtil i 
_ Kjonsregionen. Man kan adskille de samme Krops- 
Polyartemia forcipata. Fischer. 
(Pl. IX & X). 
Polyartemia forcipata, Fischer, Middendorff's Siberische Reise, 
Bd. 2. Zoologie, p. 154, Tab. III, fig. 24—28. 
Specific characters. — Body narrow cylindrical, 
of almost uniform thickness in the female, tapering 
in the male. Head in female comparatively small 
and rounded in front, in male considerably broader, 
and ending in two bluntly conical, decurved fron- 
tal processes. Tail and genital segments together 
scarcely more than half as long as the pedigerous 
part of the body. Marsupium of female broadly 
rounded in front with a nodiform protuberance on 
each side. External sexual appendages of male 
simple cylindrical, and about half the length of the 
tail. Eyes club-shaped, about the length of half 
the transverse diameter of the head. First pair of 
antenne comparatively small, shorter than the eyes. 
Second pair of antenne in female considerably 
shorter than the head, and ending in a triangular 
lappet; in male very large, tripartite, the two fore- 
most rami being curved like a forceps at the end, 
and finely ciliated on the inner margin, the hind- 
most ramus short, pointing straight inwards, and 
densely hairy at the extremity. Caudal lamelle 
broadly lanceolate, about twice as long as they are 
broad at the base. Body transparent, with a faint . 
green, blue or red tinge: that of male generally 
pale yellow. Genital segments of female above with 
2 angular ultramarine-blue patches, between which 
there are two narrow stripes of the same colour. 
Marsupium orange-coloured below. Length of female 
up to 16 mm, that of male, 10 mm. 
Remarks. — This peculiar Phyllopod was first 
discovered during Middendorff’s journey in Siberia, 
and is briefly described under the above name by 
8. Fischer, together with other Entomostraca col- 
lected during that journey. It was subsequently 
also found by other naturalists, notwithstanding 
which, no more detailed description has as yet been 
furnished. 
Description of the Female. 
The length of the body, from the frontal mar- 
gin to the end of the caudal lamella, attains to 16 
mm. It is found, however, as is also the case with 
other Phyllopoda, sexually mature long before it has 
attained this size. 
The body (see Pl. IX, figs. 1 and 2) is slender, 
cylindrical, and of almost uniform breadth through- 
out, though, in fully developed animals, perceptibly 
distended posteriorly in the sexual region. The 
