men er, som hos Branchinecta, kun indskrenket til 
sidste Halesegment, og viser en lignende Bygning 
som hos denne Slegt. 
Nervesystemet synes idethele at vere bygget 
paa samme Maade som hos Branchinecta, alene med 
den Forskjel, at Buggangliekjeden her er sammen- 
sat af et betydelig storre Antal Ganglier, overens- 
stemmende med det storre Antal Segmenter i For-. 
kroppen. 
Ovarierne (Tab. X, Fig. 12, 13, osv.) er her kun 
indskrenket til Kjonsregionen, idet de ligger til 
hver Side ved Basis af Aigbeholderen, uden at 
strekke sig ind, hverken i Forkroppen eller i den 
bagenfor AXgbeholderen liggende Del af Halen. De 
danner 2 korte cylindriske Sekke (Fig. 14), i hvis 
Indre ialmindelighed kun findes en enkelt Rekke af 
sig udviklende storre Hg fyldte med gron Blomme- 
masse, og desforuden, mere uregelmessigt fordelte, 
et Antal af meget smaa klare Celler med tydeligt 
fremtredende Kjerne.- Omtrent tra Midten af hvert 
Ovariums indre Kant udgaar Aglederen, der viser 
paa Midten en sterk, sekformig Udvidning og. mun- 
der i det indre af Agbeholderen. Mundingen er 
delvis omgivet af en meget voluminos Kjertelmasse 
(Fig. 12, 13, gl), der strekker sig igjennem hele Aig- 
beholderens Leengde, og som afgiver Stoffet til den 
sterke Skal, hvormed Aiggene her omgives. De 
modne af Ovarierne udkomne Aig ligger uregelmes- 
sigt ordnede i Agbeholderens Siderum (se Tab. IX, 
Fig. 1 og 2) og udtommes med visse Mellemrum 
gjennem dens klapformige Munding. De er da (se 
Tab. X, Fig. 15) omgivne af en temmelig tyk og 
meget fast chitinos Skal, der ved steerk Forstorrelse 
viser sig uregelmessig reticuleret. Aigindholdet er 
ensformigt kornet og af en meget mork gron, i det 
brunlige spillende Farve. Nogen Segmentering af 
Agget har jeg ikke kunnet paavise. 
Testes (Tab. X, Fig. 16, t) indtager omtrent 
samme Plads som Ovarierne, skjondt de strekker 
sig lidt ind i den bag Kjonsringene liggende Del af 
Halen. De har Formen af 2 smale Sekke, tilspid- 
sede i hver Ende, og noget tykkere fortil end bag- 
til. Noget bagenfor den forreste Ende udgaar fra 
den nedre Side Sedlederne, der, som hos Branchi- 
necta, danner en temmelig sterk, tvedelt Udvidning 
(vd), hvorpaa de hver antager Formen af en trang 
Kanal. Denne gjor en sterk slyngeformig Boining, 
inden den treder ind i de ydre Kjonsvedheng, paa 
hvis Spids den udmunder. 
Udvikling. 
Ogsaa af denne Form har jeg leilighedsvis havt 
Anledning til at undersoge flere Udviklingstrin, 
uden at det dog endnu har lykkets mig at faa stu- 
deret den hele Udvikling fra forst af. 
The rectum, as in Branchinectu, is limited to the 
last caudal segment, and exhibits a structure similar 
to that in the above-named genus. 
The nervous system seems, on the whole, to be 
constructed in the same manner as in Branchinecta, 
with the one difference that the ventral ganglion 
chain is composed of a considerably larger number 
of ganglia, corresponding to the greater number of 
segments in the anterior part of the body. 
The ovaries (Pl. X, figs. 12,13, ov) are confined 
to the genital region, and lie one on each side of 
the base of the marsupium, without extending either 
into the anterior part of the body, or into the 
caudal region behind the marsupium. They form 
two short cylindrical bags (fig. 14) within which 
there is generally only a single row of eggs under- 
going development, and filled with a green yolk-mass, 
and also, more irregularly dispersed, a number of 
minute clear cells with distinctly conspicuous nuclei. 
From about the middle of the inner edge of each 
ovary, issues the oviduct, with a large sac-like dila- 
tation in the middle, and opens into the inside of 
the marsupium. The mouth is partially surrounded 
by a very voluminous glandular mass (figs. 12, 13, 
gl), which extends through the entire length of the 
marsupium, and secretes the substance for the 
strong shell with which the egg becomes here sur- 
rounded. The mature ova that have come out of 
the ovary, are irregularly arranged in the lateral 
spaces of the marsupium (see Pl. IX, figs. 1, 2) and 
are evacuated at certain intervals through the 
valve-like mouth. They are then (see Pl. X, fig. 15) 
enveloped in a tolerably thick, and very firm chiti- 
nous shell, which on being highly magnified appears 
irregularly reticulated. The contents of the ovum 
are uniformly granulose and of a very dark green 
colour with a tinge of brown. I have been unable 
to discover any segmentation of the ovum. 
The testes (Pl. X, fig. 16, t) occupy about the 
same place as the ovaries, though they extend a 
little way into that part of the tail lying behind 
the genital segments. 
narrow bags, pointed at both ends and rather thicker 
in front than behind. From the inferior side, a little 
behind the anterior end, issue the efferent ducts 
forming, as in Branchinecta, a rather strong, bipartite 
expansion (vd), whereupon each assumes the form 
of a narrow channel. This makes a spiral curve 
before it enters the external sexual appendage, at 
the point of which it opens. 
Development. 
I have occasionally had the opportunity of exa- 
mining several developmental stages of this form 
also, although I have not yet succeeded in studying 
its whole development from the very beginning. 
They are in the form of 2 
ae 
