meget sterk Forstorrelse synlige Anleg til temme- 
lig store, med et opakt Indhold fyldte Kapsler. I 
enhver Follikel findes altid 4 Celler combinerede. 
I de mindste Follikler (Fig. 13) er blot Kjernerne 
synlige, medens i de storre Follikler (Fig. 14, 15), 
de enkelte Celler skarpt afgrendser sig fra hver- 
andre. Af de 4 Celler er det alene den yderste, der 
repreesenterer den egentlige Ag-celle; de 3 ovrige 
er kun bestemte til dennes Ernering og absorberes 
derfor tilsidst ganske. Denne polare Celle skiller 
sig ogsaa kjendeligt fra de 3 ovrige derved, at 
Kjernen er mindre skarpt contureret. Paa den fuldt 
udviklede Aigcelle unddrager sig tilsidst Kjernen 
ganske for Observationen, og heller ikke Kjernerne 
i de 3 Neringsceller kan sees paa Grund af den 
opake, gulbrune Neringsblomme, som nu fylder det 
hele Aig (se Fig. 12). Er Aggene modne, treder 
de ind i Ovariernes indre Hule og udtommes derfra 
successivt gjennem Adglederen i 11te. Fodpars AKg- 
kapsel, hvor de omgives med en temmelig fast Skal 
(Fig. 16). Denne sidste viser sig ved sterk For- 
storrelse (Fig. 16') meget fint reticuleret, og dannes 
rimeligvis ved et af Kapselens Vegge afsondret 
Secret. I hver Hgkapsel finder man i Regelen kun 
et meget begrendset Antal Mg, fra 1 enkelt (se 
Tab. XII, Fig. 17, ov) til 4, og de forbliver her kun 
en ganske kort Tid, idet de successivt udtommes af 
Kapselen og falder tilbunds, hvor de indleires i 
Mudret, for til neste Sommer at udvikle sig til en 
ny Generation. / 
Testes har samme Beliggenhed som Ovarierne 
og ligner ogsaa ved forste Oiekast disse i Udseende. 
Ved nermere Undersogelse viser imidlertidjFollik- 
lerne sig forholdsvis mindre og af mere uregelmes- 
sig, noget affladet Form og ligesom slyngede ind i 
hinanden (se Tab. XII, Fig. 17). I enhver Follikel 
er der (se Fig. 18) en indre Hule, der staar i For- 
bindelse med det centrale Hulrum, og fra Follikler- 
nes Vegge udvikler Sedelementerne sig i Form af 
meget smaa simple Celler (Fig. 19). Hvor Testes 
udmunder, har det ikke lykkets mig at faa con- 
stateret, 
Udvikling. 
_ Jeg har heller ikke af denne Phyllopode kun- 
net forfolge den hele Udvikling, men har dog leilig- 
hedsvis faaet fat paa en Del Larvestadier, som jeg 
ee mane noiere skal omtale. 
di Det tidligste observerede Stadium er afbildet 
Tab. XI, Fig. 4, og Detailler af samme, Tab. XII, 
Fig. 21—27. 
Legemet har en Lengde (fraregnet Haletra- 
dene). af kun omtrent 2 mm., 6 er halvt gjennem- 
sigtigt, af gulrod Farve. 
79 
ments, only visible under a very high power of the 
microscope, to rather large capsules with opaque 
contents. In each follicle, 4 cells are always found 
combined. In the smaller follicles (fig. 13) only the 
nuclei are visible, while in the larger ones (figs. 14, 
15) the cells are sharply divided from one another. 
Only the outermost of the 4 cells represents the 
egg-cell proper; the other 3 only serve to nourish 
that one, and are therefore at last completely ab- 
sorbed. This polar cell is also easily distinguishable 
from the other three by the less distinctly outlined 
nucleus. In the fully developed egg-cell, the nucleus 
at last entirely withdraws from sight, nor can the 
3 alimentary cells be seen on account of the opaque, 
yellowish-brown food-yolk which now fills the entire 
ovum (see fig. 12). When the eggs are mature, they 
enter the inner cavities of the ovaries, and are 
thence evacuated successively through the oviduct 
into the egg-capsule of the 11th pair of legs, where 
they are enveloped in a rather firm shell (fig. 16). 
This, when highly magnified (fig. 16), appears to be 
very finely reticulated, and is probably formed by 
a secretion from the walls of the capsule. In each 
capsule there is found, as a rule, only a very limi- 
ted number of ova, from a single one (see Pl. XII. 
fig. 17, ov) to 4, and they remain there only a very 
short time, being discharged successively from the 
capsule, when they fall to the bottom, and are im- 
bedded in the mud, to develope in the following 
summer into a new generation. 
The testes occupy a similar position to the 
ovaries, and also, at first sight resemble them in 
appearance. Upon closer examination, however, the 
follicles prove to be relatively smaller, and of a 
more irregular, somewhat flattened shape, and are, 
as it were, twisted about one another (see Pl. XIII, 
fig. 17). In every follicle (see fig. 18) there is an 
inner cavity, in communication with the central ca- 
vity, and the sperm elements develope from the 
walls of the follicles in the form of very small 
simple cells (fig. 19). I have not succeeded im ascer- 
taining where the testes discharge themselves. 
Development. 
Of this Phyllopod too, I have been unable to 
follow the whole course of development, but have 
however occasionally succeeded in finding certain 
larval stages, which I will here describe more 
minutely. 
The earliest stage observed is figured on Pl. XI, 
fig. 4, and details of the same on Pl. XIII, figs. 
21—27. 
The body has a length (not including the caudal 
filaments) of only about 2 mm. and is semi-trans- 
parent and of a yellowish-red colour. 
