78 



Lappe. Fra dets forreste Del ixdgaar til hver Side 

 og noget opad en kort og tyk Nervestamme, som er 

 Synsnerven. Efterat være traadt hen mod den 

 nedre Flade af Øiet, opløser den sig i talrige diver- 

 gerende G-rene (se Fig. 7), hvoraf hver enkelt for- 

 binder sig med et tilsvarende Synselement. Fra 

 Midten afHjernegangliets forreste Ende passerer en 

 temmelig stærk Nervestamme lige fortil og omgiver 

 med sin gangliøst opsvulmede Ende det enkle Øie 

 bagtil (se Fig. 5). Hvor Nei-verne for Følerne ud- 

 springer, har det ikke været mig muligt at se, men 

 der er Rimelighed for, at deres Ud.spring forholder 

 sig som hos Branchipodiderne. Bagtil udgaar fra 

 Hjemegangliet 2 lauge Commissurer, der omgiver 

 Spiserøret og nedentil forbinder sig med det Iste 

 Ganglion i Buggangliekjæden. Denne sidste (se Fig. 

 9, 10, 11) bestaar af en stor Mængde Ganglier sva- 

 rende til det store Antal Fødder, og er idethele be. 

 tydelig stærkere ndviklet end hos Branchipodiderne, 

 ligesom den ogsaa viser et temmelig forskjelligt Ud- 

 seende, noget nærmende sig til det hos Phyllocari- 

 derne. Som hos disse, ligger Ganglierne (se Fig. 9) 

 meget tæt sammen, om de end er tydeligt skilte 

 baade ved Længde- og Tværcommissurer. Af de 

 sidste findes, som hos andre Phyllopoder, 2 for hvert 

 Par Ganglier, og mellem dem er der en meget liden, 

 tvært oval Aalining, medens der mellem Længde- 

 commissurerne er et større, paa langs ovalt Mellem- 

 rum. Fra hvert Ganglion udgaar til Siden 2 stærke 

 Nervestammer, hvoraf den foi-reste .sti'ax deler sig i 

 2 Grene; men angaaende disse Nervestammers videre 

 Forlob har jeg ikke kunnet skaflFe mig fuld Klarhed, 

 Bagtil bliver Gangliekjæden (se Fig. 10, 11) gradvis 

 smalere og de enkelte Ganglier tættere sammen- 

 trængte, saaat Commissurerne mellem dem vanske- 

 ligt adskilles. Den ender i en stump Spids paa det 

 Sted, hvor de sidste Par rudimentære Fodder findes. 

 Fra denne bagerste Del af Buggangliekjæden iidgaar 

 Nerverne for Halen ; men heller ikke om disses For- 

 løb har jeg kunnet skaffe mig et klart Begreb. 



Ovarierne (Tab. XIII, Fig. 1, 2, ov) repræsen- 

 teres af 2 temmelig voluminøse og stærkt lappede 

 Organer, der strækker sig langs Siderne af Tarmen 

 igjennem Størsteparten af den fodbærende Del af 

 Kroppen. De munder hvert med en kort Ægleder 

 ved Basis af Ilte Fodpar, og indeholder et indre 

 Hulrum, der staar i direkte Forbindelse med Æg- 

 lederen Undersoges et Stykke af de udpræparerede 

 Ovarier under Mikroskopet, vil man tinde, at ethvert 

 sig udviklende Æg er indesluttet i en Follikel, der 

 rager frem fra Ovariets (Jverflade i Form af en af- 

 rundet, mere eller mindre fremspringende Blære. 

 Man finder paa samme Stykke Ovarium Æg i alle 

 Udviklingsstadier, fra overordentlig smaa, kun ved 



found in the latter. From the anterior part there 

 issues on each side, going a little upwards, a short, 

 thick nerve-stem, which is the optic nerve. After 

 advancing towards the lower surface of the eye, it 

 is resolved into numerous divergent branches (see 

 fig. 7), each one of which unites with a correspond- 

 ing visual element. From the anterior end of the 

 cerebral ganglion, a tolerably strong nerve-stem 

 passes forwards and surrounds posteriorly, with its 

 ganglionic swollen end, the ocellus (see fig. 5). It 

 has not been possible for me to see where the 

 nerves for the antennæ originate, but it is probable 

 that their origin is the same as in the Branchipo- 

 didæ. From the cerebral ganglion, posteriorly, run 

 two long commissures, which encircle the æsophagus, 

 and unite below with the first ganglion in the ven- 

 tral ganglion chain. The latter (see figs. 9, 10, 11) 

 consi.sts of a considerable number of ganglia corres- 

 ponding to the large number of legs, and is in the 

 whole, much more highly developed than in the 

 Branchipodidæ, exhibiting too, a rather different ap- 

 pearance, somewhat approaching that of the Phyllo- 

 caridæ. As in that group, the ganglia (see fig. 9) 

 lie very close together, although distinctly separated 

 both by longitudinal and transverse commissures. 

 Of the latter there are, as in the other Phyllopoda, 

 two to each pair of ganglia, and between them 

 a very small, transversely oval opening, while be- 

 tween the longitudinal commissures, there is a larger, 

 longitudinally oval .space. From each ganglion there 

 issue laterally 2 strong nerve-stems, the anterior of 

 which immediately divides into 2 rami; but concer- 

 ning the farther course of these nerve-stems, I have 

 been imable to ascertain anything clearly. Poste- 

 riorly, the ganglionic chain (see figs. 10, 11) becomes 

 gradually narrower, and the several ganglia more 

 crowded, so that the commissures between them are 

 difficult to distinguish. It ends in a blunt point at 

 the place where the last pair of rudimentary legs are 

 found. From this posterior part of the ventral 

 ganglion chain issue the nerves for the tail, but in 

 their case also, I have been unable to obtain any 

 clear idea as to the course they take. 



The ovaries (PI. XIII, figs. 1, 2, ov) are repre- 

 sented by 2 rather voluminous and much lobed or- 

 gans, extending along the sides of the intestine 

 throughout the greater part of the body. They each 

 open by a short oviduct at the base of the 11th 

 pair of legs, and contain an inner cavity, which is 

 in direct communication with the oviduct. On exa- 

 mining a portion of the dissected ovary under the 

 microscope, it will be seen that each of the eggs 

 undergoing development is enclo.sed in a follicle, 

 which projects from the surface of the ovary in the 

 form of a rounded, more or less projecting vesicle. 

 On the same piece of ovary are found eggs in all 

 stages of development, from exceedingly small rudi- 



