79 



meget stærk Forstorrelse synlige Aiihi'g til temme- 

 lig store, med et opakt Indliold fyldte Kapsler. I 

 enhver Follikel tindes altid 4 Celler eonibinerede. 

 1 de mindste Follikler (Fig. liJ) er bhit Kjernerne 

 .sj-iilige, medens i de storre Follikler (Fig. 14. 15), 

 de enkelte ('(dier skar])t afgrændser sig fra hver- 

 andre. Af de 4 Celler er det alene den yderste, dea' 

 rejjrsesenterer den egentlige Æg-eelle ; de o ovrige 

 er knn bestemte til dennes Eriueriiig og absorberes 

 derfor tilsidst ganske. J.)enne jiolare Celle skiller 

 sig ogsaa kjendeligt fra de 3 ovrige derved, at 

 Kjernen ei' mindre skarpt eiailnreret. Faa den fuldt 

 udviklede Ægeelle iinddragei' sig tilsidst Kjernen 

 ganske for (Jbservationen, og heller ikke Kjernerne 

 i de i) Næringsceller kan sees paa (irnnd af den 

 o])ake, gulbrnne Næringsblomme, som nn fylder det 

 hele Æg (se Fig. 12). Er Æggene modne, tra'der 

 de ind i ( )variernes indre Hule og udtommes derfra 

 successivt gjennem Æglederen i Ilte Fodpars Æg- 

 kapsel, hvor de omgives med en temmelig fast Skal 

 i,Fig. IG). Denne .sidste viser sig ved stærk For- 

 .storrelse (Fig. IG') meget tint reticnleret, og dannes 

 1'imeligvis ved et af Ka])seleiis Yægge afsondret 

 Secret. 1 hver Ægkapsel tinder man i Regelen kun 

 et meget begrændset Aiital Æg. fra 1 enkelt (se 

 Tab. XIJ, Fig. 17, ov) til 4, og de forbliver her kun 

 en ganske kort Tid, idet de siu'cessivt udtommes af 

 Kapselen og falder tilbunds. liv(jr de indleires i 

 Mudret, for til næste Sommer at udvikie sig til en 

 ny Generation. 



Testes har samme Beliggenhed som Ovaiierne 

 og ligner ogsaa ved forste Øiekast disse i 1'dseende. 

 Ved nærmere Undersogelse viser imidlertid Follik- 

 lerne sig forholdsvis mindre og af mere uregelmæs- 

 sig, noget aftladet Form og ligesom slyngede ind i 

 hinanden (se Tab. XIII, Fig. 17). I enhver Follikel 

 er der (se Fig. IH) en indre Hule. der staar i For- 

 bindelse med det centrale Hulrum, og fra Follikler- 

 nes Vægge udvikler Sædelenienterne sig i Form af 

 meget smaa sinijde Celler (Fig, l',l). iiviu' Testes 

 udmunder, hai- det ikke lyk'kets mig at i'aa con- 

 stateret. 



ments, oriK' visilde under a very high power of the 

 mieroseope, to rather large capsules with o]ia(|ue 

 contents, ln 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 outei'niost of the 4 cells represents the 

 egg-cell jjroper; the other 3 only serve to nonrisii 

 that (Jiie, and are therefore at last completely aVi- 

 sorbed. This ])olar 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 opa(|Ue, 

 yellowish-bi'own food-yolk whicli now fills the entire 

 ovum (see fig. 12). W'lien the eggs are mature, they 

 enter the inner cavities of the ovaries, and are 

 thence evacuated successively through the oviduct 

 into tlie egg-ca])sule nf the Uth ])air of legs, where 

 they are enveloped in a ratiier firm shell (fig. IG). 

 This, when highly magnified (fig. IG), apjjears to lie 

 ver\- finely reticulated, and is ])robably formed by 

 a secretion fmm the walls of the capsule. In each 

 capsule there is found, as a rule, only a ver\' limi- 

 ted number of ova, from a single one (see PI. XII. 

 fig. 17, ov) to 4, and they remain there only a very 

 short time, being discharged successively fmni the 

 ea])sule, when the\- fall to the bottom, and are im- 

 bedded in the mud, to de\-elo])e in the following 

 sununer into a new generation. 



The testes occupy a similar ])osition to the 

 o\aries, and also, at first sight r(>semble them in 

 a])pearance. Upon closer examination, however, tlie 

 fiiliicles jirove to be i-elatively smaller, and of a 

 nunc irregular, sonu^what fiattened shajie, ami are, 

 as it were, twisted about one anotliei- (see i'l. Xlll, 

 fig. 17). In every tollicle (see fig. IS) there is an 

 inner cavitv, in connnunication with the central ca- 

 vity, and the sperm elements develope from the 

 walls (if the follicles in the form of very snuiU 

 simjde cells (fig. 19). 1 have not succeeded in ascer- 

 taining where the testes discharge themselves. 



T'dvikliiig. 



• leg har heller ikke af denne Phyllo|>(ide kun- 

 net forfolge den hele Udvikling, men har dog leilig- 

 hedsvis faaet fat paa en Del Larvestadier, som jeg 



her miget noicrc skal omtale. 



Det tidligste observcrede Stadium er af bildet 

 Tab. XI, Fig. 4, og Detailler af samme, Tal». XIII, 

 Fig. 21—27. 



Legemet har en La^ngde (fraregnet Haletraa- 

 dene) af kun omtrent 2 mm., og er halvt gjennem- 

 sigtigt, af gulrod Farve. 



DovclopniPiit. 



Of this riiylhipod too. 1 luive been unable t<> 

 f(jll()W the whole course of development, but have 

 however occasionally succeeded in finding certain 

 larval stages, which 1 will In^re describe more 

 minutely. 



The earliest stage ob.served is figured on i'l. .\1. 

 fig. 4, and details of the same <m I'l. Xlll. tigs. 

 21—27. 



The body has a length (not including the caudal 

 filaments) of only about 2 mm. and is semi-trans- 

 jiarent and of a ydlowish-red cohiur. 



