52 



gaiigliose Masse ndgaar igjen overordentlig jfine 

 Xeivefibre til ethvert af de her faestede Vedhteiig. 



Sj'iisnerveriie (Fig. 4, o) dajmer til hver Side en 

 stærk, lige ridad gaaende Stamme, der, etterat væi'e 

 traadt ind i Øienstilkeiie, svulmer iid til et kolbe- 

 formigt Synsganglion. Dette (se Fig. (i) er ved en 

 transversal Indsnøring delt i 2 paa hinanden føl- 

 gende Knnder eller Segmenter og ndsender fra sin 

 noget skjaevt afrnndede Ende talrige divergerende 

 Nervetraade, der passerer til de enkelte Synselemen- 

 ter. Ethvert af disse sidste er (se Fig. 7) isoleret 

 ved en c ylindrisk Skede, i hvis indre den saakaldte 

 Synsstav sees som en tint tværstriliet Axe (c), stræk- 

 kende sig mod Periplierien af Øienglolnen, hvor den 

 forbinder sig med en kegleformig fastere Del. den 

 saakaldte Krystalkegle (hl Denne er onigivet af 

 et morkerodt Pigment og ender med et stærkt lys- 

 brydende, lindseformigt Legeme af ellipsoidisk Form 

 (a). Den Øiengloben omgivende ydre Hnd (cornea) 

 er ganske glat, nden Spor af Facetter. 



Kjønssystemet. — Han- og Hnn-Organeme for- 

 holder sig meget ulige, saavel livad Bygning som 

 Beliggenhed angaar, og maa derfor beskrives sær- 

 skilt. 



Ovarierne (se Tab. VI, Fig. 3 og 4. Tab. VIII, 

 Fig. 11") strækker sig i Form af 2 smale cylindriske 

 Sække igjennem Størsteparten af Trnnens, til hver 

 Side af og noget nedenunder Tarmen. Deres for- 

 reste Ende er omtrent beliggende ved (-frændsen af 

 4de og 5te fodbærende Segment; den bagerste Ende 

 strækker sig ind i selve Kjonsringen. Derinind tin- 

 des ingen Del af Ovarierne i selve Bagkroppen, saa- 

 ledes som Tilfældet er hos SJægten Biutuhipns. I 



nogen Afstand fra dere.s bagre Ende udgaar fra 

 hvert Ovarinni nedad en kort og tyk Ægleder, der 

 udmnnder i Basis af Æggesækken. Æglederne er 

 delvis (imliyllede af en volnminos Kjertel, der af- 

 sondrer Stoffet til Æggeskallen. I Ovariernes Indre 

 tindes som oftest knn en enkelt Eække af sig nd- 

 viklende Æg (se Tab. VIII. fig. 11), med gronagtig 

 Blomniemasse og mere eller mindre tydelig Kim- 

 blære. Æggene synes at ndvikle sig fra den fori'e- 

 ste Ende af Ovarierne, da her findes sammenhobede 

 en hel Del smaa Celler. Fra Ovai'ierne passere 

 Æggene, eiterhyei't som de modnes, ind i den sæk- 

 formige Matrix, hvor de omgives med sin Skal. 

 Denne er temmelig fast og tyk, og viser sig i Tvær- 

 snit tydeligt doljbelt knntnreret. Ægindholdet er i 

 de fleste Tilfælde uniformt, tintkornet, nden tydelig 

 Kimblære (Fig. 14). I enkelte Tilfælde (Fig. 13) 

 .syntes Klovningsprocessen allerede at være begyndt, 

 da Ægindholdet var delt i 4 skarpt begrændsede 

 Segmenter. 



ganglionic mass at the end of the antenna. From 

 this ganglionic mass again, exceedingly delicate 

 nerve-fibres rnn ont to each of the appendages there 

 attached. 



The ojjtic nerves (fig. 4, o) form, on each side, a 

 strong stem going straight ont, which, after having 

 entered the eye-stalks swells ont to a clnb-shaped 

 opitic ganglion. This (see fig. (J), l»v a transverse 

 constriction, is divided into 2 successive dilatations 

 or segments, and sends ont, from its somewhat obli- 

 i|nely rounded end. numerous divergent nerve-fila- 

 ments, which pass to the several visual elements. 

 Each of these is isolated by a cylindrical sheatii 

 (see rig. 7) in the interior of which the so-called 

 opjtic rod is visible in the shape of a finely trans- 

 versely striped axis (c) extending towards the peri- 

 phery of the eye-ball, where it unites with a firmei', 

 conical part, the so-called crystalline cone (1)) The 

 lafter is surrounded by a dark-red pigment, and ends 

 in a strongly refractive lentiform body, ellipsoid in 

 shape (a). The skin (cornea) snrrorinding the eye- 

 ball is quite smooth, without a trace of facets. 



Generative system. — The male and female 

 organs are very dissimilar, Itoth as regards struc- 

 ture and ])osition, and must therefore be separately 

 described. 



The ovaries (see IT. VI, figs. 3 and 4, PL VIII, 

 fig. 11) extend in the form of 2 narrow cylindrical 

 bags through the greater part of the trunk, on each 

 side of. and a little below the intestine. Their an- 

 terior end lies almost at the boundary between tlie 

 4th and 5th pedigeroi;s segments; the posterior end 

 extends into the genital segment itself. On tlie 

 other hand, no part of the ovaries is found in the 

 ])osterior pai't of the Ijody, as is the case in the 

 genus BramJ/ijii/f!. At some distance from their 

 posterior ends, a short, thick oviduct issues from 

 each ovary, passing downwards, and opening into 

 the liase of the ovisac. Tlie oviducts are partially 

 enveloped by a voluminous gland which secretes 

 the substance for the shell of the egg. In the inte- 

 rior of the ovary there are found, as a rule, only a 

 single I'ow of ova in process of develo])ment (see PI. 

 VIII, fig. 11), with a greenish yolk-nuiss, and more 

 or less distinct germ-ve.sieles Tlie ova a])pear to 

 lie developed -trom the anterior end of the ovaries, 

 as a number of small cells are here found crowded 

 together. Each egg, as it matures, passes from the 

 ovary inio the sac-lil<e marsujiium, where it is en 

 velo]ied in its shell. This is tolei'ably firm and 

 tliirk, and in transvei'se sections shows a distinct 

 (b)nbb' outline. The contents of tlie ova are, in 

 most cases, uniform, finely granular and without 

 distinct germ-vesicles (fig. 14). In one or two cases 

 (fig. 14), the cleavage process seems to have already 

 begun, the contents of the ovum being divided into 

 4 sharply-defined segments. 



