99 



kjærner synbare; men meget snart sondres dog det 

 til enliver Kjærne horende Plasma og afgrændser 

 sig ved skarpt markerede Linier. Samtidigt Ijegyn- 

 der den terminale Celle hurtigt at voxe og fylder 

 sig med et opakt kornet Indliold, medens de 3 ovrige 

 Celler foi-bliver gjennemsigtige og omvendt reduceres 

 i Størrelse, saa at de tilsidst kun er tilstede som 

 ubetydelige Eudimenter ved den indre Side af den 

 egentlige Ægeelle. Denne sidste naar tilsidst (se 

 Fig. 17) en temmelig anselig Storrelse og fylder den 

 hele FoUikel, som nu sjiringer frem fra (Jvarialroret 

 som en kugleformig, kort stilket Blære. Er Æggene 

 færdige, losnes de fra Folliklernes Vægge og træder 

 ind i Ovariernes Hule. I denne har der imidlertid 

 ansamlet sig et opakt hvidagtigt Iiulhold (se Tab. 

 XIV, Fig. li), der paa friske Exemplarer viser sig 

 overordentlig hnt kornet, men paa Spiritusexemplarer 

 hurtigt coagulerer til en compakt gulbrun Masse, der 

 indtager Axen af Ovarialrorernes indre Hule og 

 delvis ogsaa fortsætter sig ind i Æglederen. Hette 

 Indhold synes at være et Secretionsprodukt af 

 Ovarialrorernes Vægge, bestemt til at afgive Mate- 

 rialet til den eiendommelige Skal eller Kapsel, der 

 senere omgiver jivert enkelt Æg. I Begyndelsen, 

 etterat være indkomne i Ovariernes indre Hule, er 

 dog Æggene 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 ojiliolde 

 sig i Ovarialhnlen i længere Tid, og bliver herunder 

 ved peristaltiske Bevægelser af Ovarierne .skyvet 

 frem og tilbage, livorved dei'es Overtiade 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 færdig, skjondt endnu blod og boielig, forend 

 Æggene gjennem Æglederen u.dfores af Legemet. 

 De samler sig deretter umiddelbart over Trnncus til 

 en compact Masse, der holdes i Situs ved Hjælp af 

 den traadformigt forlængede dorsale Lap af 9de til 

 Ilte Fodpars Exopoditer (se Tab. XIV, Fig. 1, 2). 

 Ægmassen, der ligger noget foran Midten af Skal- 

 lens dorsale Hule, viser en temmelig uregelmæssig 

 Form, med den ovre Flade stærkt hvælvet, den 

 nedre concav, og Kanterne uregelmæssigt indskaarne. 

 Den bæres her af Dyret i længere Tid, indtil Æg- 

 kapslerne har naaet den fornødne Fasthed, og dens 

 Farve forandres herunder gradvis fra en meget lys, 

 hvidagtig til en mork hornljrun Couleur. De i den 

 indeholdte Æg, der er holdte sammen ved et klæb- 

 rigt Stof, er meget smaa og derfor i Regelen over- 

 ordentlig talrige. De er hvert omgivet af en lioist 

 •eiendommeligt udseende og meget fast Kapsel af 

 uæsten turbinlignende Form (se Tab. XVI, Fig. 20, 

 21, 22), med 2 lodret paa liinanden stillede vinge- 

 formige Udvidninger. Langs ad den ene af disse 

 Udvidninger loljer en tydelig fortykket Kibbe, hvor- 



which ai-e somewhat cylindrical in shape, only the 

 4 cell-nuclei are visil)le; but very soon the ])lasma 

 belonging to eacli nucleus is separated and defined 

 by clearl^'-marked lines. At the same time the ter- 

 minal cell begins to ^row quickly, and to l)e filled 

 with contents of an ()pai[ue, granular character, 

 while tlie 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 

 tlie ovaries. Here an iipa([ue, wliitisli matter has 

 meanwhile collected (see PI. XIV, fig. 6), which in 

 fresh specimens a]ipears to be very finely granular, 

 liut in spirit specimens rapidly coagulates into a 

 compact yellowish-brown mass (tccupying the axis 

 of the inner cavities of the ovarial tubes, and is 

 also to some extent continued into the oviduct. 

 This substance seems to Ije a secretive product of 

 the walls of the ovarial tubes, designed to furnisli 

 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 tlierefore assume vai'ious 

 shapes resulting from reciprocal pressure, or from 

 their passage through narrow parts of the ovaries 

 (see PI. 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 tlie above-mentioned secretion. 

 The fii'st indication of a shell is soon observable 

 upon them (see fig. 19), and, though soft and pli- 

 able, it is ([uite perfect before the ovnm is evacu- 

 ated from the body through the oviduct. The ova 

 then collect immediately above the triuik, into a 

 compact mass, which is retained in position by the 

 aid of the filiformly elongated dorsal lappet of the 

 exopdditc of the 9th, 10th and 11th j^airs of legs 

 (see PI. XIV, figs. 1 , 2). The egg-mass, which lies a 

 little in frojit of the middle of the dorsal cavity of 

 the shell, is of a rather irregular shape, with the 

 ujiper surface iiighly convex, the lower concave, and 

 the edges irregularly indented. It is carried liere 

 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, wliitish hue to a dark horny brown colour. 

 The ova composing it are lield togetlier by a glu- 

 tinous substance, and are very small and tlierefore 

 generally exceedi)igly numerous. They are each 

 enveloped in a vei-y firm capsule of most ])eculiar 

 appearance, and almost turbinate shape (see PI. XVI, 



