63 
tydelig smekrere end hos Hunnen (se Tab. IX, Fig. | hand, is very different to, and much more slender 
3 og 4, Tab. X, Fig. 6). De 2 Kjonsringe er tyde- | than that of the female (see Pl. IX, figs. 3 and 4; 
ligt adskilte i sit dorsale Parti og er, ovenfra seede, 
neppe. bredere end Truncus. Derimod danner de 
nedad en noget uregelmessig Udvidning, hvorfra de 
ydre Kjonsvedheng udgaar. Disse sidste er for- 
holdsvis storre end hos Branchinecta og af noget ner 
eylindrisk Form, eller kun ganske svagt afsmalnende 
mod Enden, og har det ydre Parti tet besat med 
fine Haar. Den bagenfor liggende Del, den egent- 
lige Hale, afsmalnes gradvis bagtil og er, uligt hvad 
Tilfeeldet er hos Hunnen, delt i 6 tydeligt begraend- 
sede Segmenter, foruden Halegrenene. Disse sidste 
er fuldkommen af samme Udseende som hos Hunnen. 
Farve. — Legemet er hos begge Kjon i levende 
Tilstand meget gjennemsigtigt, saa at de indre Or- 
ganer mere eller mindre tydeligt skinner igjennem 
de tynde Integumenter. Hos Hunnerne har det ial- 
mindelighed et svagt gronligt Anstrog, medens det 
hos Hannerne viser en lys gulagtig Tone. Dog va- 
rierer Farven betydeligt hos begge Kjon efter Lo- 
kaliteterne og spiller undertiden over i det blaalige 
eller rodlige. Hos fuldt udviklede Hunner findes 
meget constant (se Tab. IX, Fig. 1 og 2) paa Ryg- 
siden af Kjonsregionen 2 sidestillede rudeformige 
Pletter af en intensiv ultramarinblaa Farve og ind- 
fattede af en morkere Kant. Enhver af disse Plet- 
ter forlenger sig sedvanligvis fortil i en smal Stribe 
af samme Farve, og mellem begge disse sees ialmin- 
delighed 2 andre tet sammenstillede Lengdestriber 
af en lignende Couleur. Den forreste Del af Ag- 
beholderen er i Regelen orangefarvet, medens den 
bagerste Del viser nogle uregelmessige violette 
Shatteringer. De i Mghbeholderen indsluttede Hg 
er morkt gronfarvede. Hos Hannerne er ofte Spid- 
serne af Gribeantennernes Grene mere eller mindre 
tydeligt orangefarvede, og undertiden det bagerste 
Segment af Halen violet anstroget (se Tab. IX, Fig. 
3 og 4). 
Indre Organer. 
Tarmen strekker sig, som hos Branchinecta, i 
Form af et simpelt cylindriskt Ror igjennem hele 
Legemet (se Tab. IX, Fig. 1—4), og er ialmindelig- 
hed fyldt med orangefarvet Indhold, der bagtil grad- 
vis antager en morkere brunagtig Farve. I Hovedet 
udgaar fra Forenden af Tarmroret 2 korte Blind- 
sekke af en lignende Structur som hos Branchinecta. 
_ Spiseroret (Tab. X, Fig. 4, 5, 0) viser ved sin For- 
bindelse med Tarmroret en eiendommelig klapformig 
Indretning, ligesom der paa dette Sted findes et 
 Slags chitinagtigt Stotteapparat besat med et Antal 
af steerke, i Tarmens indre frit fremspringende borste- 
 formige Fortsatser, cilierede i Kanterne. Endetar- 
| Pl. X, fig. 16). 
The two genital segments are dis- 
tinctly separated in their dorsal part, and, when 
seen from above, are scarcely broader than the 
trunk. Below, however, they form a somewhat irre- 
gular expansion, from which the external sexual 
appendages issue. The latter are relatively larger 
than in Branchinecta, and nearly cylindrical in form, 
being only very slightly tapered towards the end, 
and with the outer part covered with fine hairs. 
The posterior portion, or tail proper, tapers gradu- 
ally towards the end, and, unlike that of the female, 
is divided into 6 distinctly-defined segments, besides 
the caudal rami. The latter are of exactly the 
same appearance as those of the female. 
Colour. -~In the living state, the body in both 
sexes is very transparent, so that the internal or- 
gans are traced more or less distinctly through the 
thin integuments. In the females, it has generally 
a faint tinge of green, while in the males, it exhi- 
bits a light yellow shade. The colour varies, how- 
ever, considerably in both sexes, according to the 
localities, and sometimes has a blue or a red tint. 
In fully developed females, there is very generally 
found (see Pl. IX, figs. 1 and 2) on the dorsal side 
of the sexual region, 2 juxtaposed, diamond-shaped 
patches of an intense ultramarine-blue, surrounded 
by a darker rim. Each of these patches is generally 
prolonged anteriorly into a narrow stripe of the 
same colour, and between them are generally to be 
seen two other longitudinal stripes of the same 
colour, placed close together. The anterior portion 
of the marsupium is, as a rule, orange-coloured, 
while the posterior part exhibits some irregular 
purple markings. The eggs enclosed in the marsu- 
pium are of a dark green colour. In the males, the 
tips of the rami of the prehensile antenne are fre- 
quently more or less distinctly orange-coloured, and 
the hindmost. segment of the tail is often tinged 
with purple (see Pl. IX, figs. 3 and 4). 
Internal Organs. 
As in Branchinecta, the intestine runs in the 
shape of a simple cylindrical tube throughout the 
length of the body (see Pl. IX, figs. 1—4), its con- 
tents being generally of an orange-colour, gradually 
assuming a darker brown hue posteriorly. From 
the anterior end of the intestinal tube, in the head, 
there issue 2 short ceca of a structure similiar to 
that in Branchinecta. The esophagus (Pl. X, figs. 
4, 5, 0) exhibits at its junction with the intestinal 
tube, a peculiar valve-like arrangement, and also at 
the same place a kind of chitinous support, clothed 
with a number of strong, setiform spikes with cili- 
ated edges, freely projecting inside the intestine. 
