99 
kjerner synbare; men meget snart sondres dog det | which are somewhat cylindrical in shape, only the 
til enhver Kjerne horende Plasma og afgrendser 
sig ved skarpt markerede Linier. Samtidigt begyn- 
der den terminale Celle hurtigt at voxe og fylder 
sig med et opakt kornet Indhold, medens de 3 ovrige 
Celler forbliver gjennemsigtige og omvendt reduceres 
i Storrelse, saa at de tilsidst kun er tilstede som 
ubetydelige Rudimenter ved den indre Side af den 
egentlige Aigcelle. Denne sidste naar tilsidst (se 
Fig. 17) en temmelig anselig Storrelse og fylder den 
hele Follikel, som nu springer frem fra Ovarialroret 
som en kugleformig, kort stilket Blere. Er Mggene 
ferdige, losnes de fra Folliklernes Vegge og treeder 
ind i Ovariernes Hule. I denne har der imidlertid 
ansamlet sig et opakt hvidagtigt Indhold (se Tab. 
XIV, Fig. 6), der paa friske Exemplarer viser sig 
overordentlig fint kornet, men paa Spiritusexemplarer 
hurtigt coagulerer til en compakt gulbrun Masse, der 
indtager Axen af Ovarialrorernes indre Hule og 
delvis ogsaa fortseetter sig ind i Auglederen. Dette 
Indhold synes at vere et Secretionsprodukt af 
Ovarialrorernes Veegge, bestemt til at afgive Mate- 
rialet til den eiendommelige Skal eller Kapsel, der 
senere omgiver hvert enkelt Mg. I Begyndelsen, 
efterat vere indkomne i Ovariernes indre Hule, er 
dog ggene endnu nogne, og antager derfor for- 
skjellige Former ved gjensidigt Tryk eller derved, 
at de passerer igjennem trangere Steder af Ovari- 
erne (se Tab. XVI, Fig. 16). De synes at opholde 
sig i Ovarialhulen i lengere Tid, og bliver herunder 
ved peristaltiske Bevegelser af Ovarierne skyvet 
frem og tilbage, hvorved deres Overflade kommer i 
intim Contact med det ovenomtalte Secret. Snart 
observeres ogsaa paa dem den forste Antydning til 
Skallen (se Fig. 19), og denne er ialmindelighed 
fuldt feerdig, skjondt endnu bled og boielig, forend 
Eggene gjennem Aglederen udfores af Legemet. 
De samler sig derefter umiddelbart over Truncus til 
en compact Masse, der holdes i Situs ved Hjelp af 
den traadformigt forlengede dorsale Lap af 9de til 
llte Fodpars Exopoditer (se Tab. XIV, Fig. 1, 2). 
Aigmassen, der ligger noget foran Midten af Skal- 
lens dorsale Hule, viser en temmelig uregelmessig 
Form, med den ovre Flade sterkt hvelvet, den 
nedre concav, og Kanterne uregelmessigt indskaarne. 
Den beres her af Dyret i lengere Tid, indtil Ag- 
kapslerne har naaet den fornodne Fasthed, og dens 
Farve forandres herunder gradvis fra en meget lys, 
hvidagtig til en mork hornbrun Couleur. De i den 
indeholdte Aig, der er holdte sammen ved et kleb- 
rigt Stof, er meget smaa og derfor i Regelen over- 
ordentlig talrige. De er hvert omgivet af en hoist 
eiendommeligt udseende og meget fast Kapsel af 
nesten turbinJignende Form (se Tab. XVI, Fig. 20, 
21, 22), med 2 lodret paa hinanden stillede vinge- 
formige Udvidninger. Langs ad den ene af disse 
Udvidninger lober en tydelig fortykket Ribbe, hvor- 
4 cell-nuclei are visible; but very soon the plasma 
belonging to each nucleus is separated and defined 
by clearly-marked lines. At the same time the ter- 
minal cell begins to grow quickly, and to be filled 
with contents of an opaque, granular character, 
while the 3 other cells remain transparent, and are 
inversely reduced in size, until at last they are 
only present as indistinct vestiges on the inner 
side of the egg-cell proper. The latter at last (see 
fig. 17) attains a very considerable size, and fills 
the whole follicle, which now projects from the 
ovarial tube like a spherical, short-stalked vesicle. 
When the ova are ready, they become detached from 
the walls of the follicles, and enter the cavities of 
the ovaries. Here an opaque, whitish matter has 
meanwhile collected (see Pl. XIV, fig. 6), which in 
fresh specimens appears to be very finely granular, 
but in spirit specimens rapidly coagulates into a 
compact yellowish-brown mass occupying the axis 
of the inner cavities of the ovarial tubes, and is 
also to some extent continued into the oviduct. 
This substance seems to be a secretive product of 
the walls of the ovarial tubes, designed to furnish 
the material for the peculiar shell or capsule which 
subsequently envelopes each ovum. At first, after 
having entered the inner cavities of the ovaries, the 
ova are still naked, and therefore assume various 
shapes resulting from reciprocal pressure, or from 
their passage through narrow parts of the ovaries 
(see Pl. XVI, fig. 16). They appear to remain for 
some time in the ovarial cavity, and, by peristaltic 
movements of the ovaries, are pushed backwards 
and forwards, their surfaces thus being brought into 
close contact with the above-mentioned secretion. 
The first indication of a shell is soon observable 
wpon them (see fig. 19), and, though soft and pli- 
able, it is quite perfect before the ovum is evacu- 
ated from the body through the oviduct. The ova 
then collect immediately above the trunk, into a 
compact mass, which is retained in position by the 
aid of the filiformly elongated dorsal lappet of the 
exopodite of the 9th, 10th and 11th pairs of legs 
(see Pl. XIV, figs. 1, 2). The egg-mass, which lies a 
little in front of the middle of the dorsal cavity of 
the shell, is of a rather irregular shape, with the 
upper surface highly convex, the lower concave, and 
the edges irregularly indented. It is carried here 
by the animal for some time, until the egg-capsules 
have acquired the necessary firmness, and during 
that time its colour gradually changes from a very 
light, whitish hue to a dark horny brown colour. 
The ova composing it are held together by a glu- 
tinous substance, and are very small and therefore 
generally exceedingly numerous. They are each 
enveloped in a very firm capsule of most peculiar 
appearance, and almost turbinate shape (see Pl. XVI, 
