138 



\0 . 

 Dvrige Bokstaver 



Fij». 3. Kn Fod af Iste Par; 1 — 5 Endopoditen med sine En- 

 (liter; ex Exopoditen; ex' dens dorsale Lap; ep Epi- 

 poditen; mx Coxallappen. 



4. En Coxallap isoleret og sta^rkere forstørret, sect fra 

 Indsiden. 



5. En Fod af sidste 23de'i Par, ved samme Forstørrelse 

 som Fig-. 3. 



6. Samme Fo<l, stærkere fijrstørret. 



7. Bagenden af Legemet, seet fra venstrt.' Side. 



8. Halen seet bagfra. 



0. Hjernegangliet med de fra samme udgaaende Xerver 

 og det enkle Øie, seet fi-a venstre Side. c selve Hjerne- 

 gangliet; opt Synsnerven; a' Xerver for Iste Par Fø- 

 lere; a^ Nerver for.Varerne; oe det enkle Øie; x ilet- 

 tes forreste Ligament. 



10. Hjernegangliet tilligemed de sammensatte Øiiie 

 seet ovenfra, m Øiemnskler. Dt 

 som paa foregaaende Figur. 



11. Det enkle Øie seet fi:)rfra. 



12. Samme bagfra. 



13. Samme nedenfra, 



14. En Del af Buggangliekj:eden, seet nedenfra. 

 . 1-5. Et Ovarium af et ganske ungt Individ. 



: 16. F;t (")varium af et a^ldre Indi^^d, kort efter at Æg- 

 gene fra Folliklernc er indkommen i Øvarialroret. 

 x Æglederen. 



17. Et Stykke af et andet Ovarium, med Ægfollikler i 

 forskjellig 1'dyikliug. 



18. Forskjellige .Egfollikler, isolerede. 



U). Et .Eg udtaget af Ovarialrorene. Skallen liar netop 

 begyndt at danne sig. 

 20— 1'2. Et fuldfuTdigt Æg med sin Kapsel, seet i 3 for- 

 skjellige Stillinger. 



23. Et Stykke af den ene vingeformige Udvidning af 

 Ægkapselen, sta-rkt forstørret. 



Tab. XVII. 



Limnadia hmticularis, Lin.) 



iJJdvikling). 



Fig. 1. En netop udklrekket Larve, seet nedenfra, oe det 

 enkle Øie; rt' Iste Par Følere; a' 2det Par Følere 

 iAarerne); Mp Mamlibularfodderne; L Overlæben; 

 f Haleindsnittet. 



2. En Larve efter Iste Iludskiftning, ovenfra seet. 



3. .Eldre Larve seet nedenfra. 



4. Et senere Stadium, paa hvilket det første Anlæg til 

 de sammensatte Øine, Rygskjoldet og Fodderne kan 

 adskilles, seet ovenfra. 



5. Ældre Larve, seet nedenfra. 



6a. En Føler af Iste Par, stærkt forstørret. 



6. Et noget ;eldre Stadium, seet fra venstre Side. Ven- 

 stre Aare er udeladt. 



7. Sidste Larvestadium, ovenfra seet. 



8. Unge i Iste postlarvale Stadium, seet ovenfra. 



'.). Samme seet fra veustn' Sid(>. 



Tab. XVIJI. 

 Limnetis hrachyurns. Midl.) 



Fig. 3. 



Fig. 1. 1'ulilvoxen, lOgbærendc Hun, seet fra venstre Side. 



' 2. Sanmie nedenfra. 



3. Fulilvoxeu Han, seet fra høire Side. 



-1. no\edet af v\\ Hun, seet forfra. 



lU 



11. 

 12. 

 13. 

 14. 

 15. 

 111. 



17. 



18. 

 10. 



20- 



23 



Fig. 1. 



A leg of the 1st pair; l—o, endopodite «ith its en- 

 diti's; ex, exopodite; fj;', dorsal lolie of the latter; 

 ep, epipodite; mx, enxal Inbe. 



A coxal lobe isnlated and more highly raagnitied, 

 seen from inside. 



A leg of the last :23rd jiair, umler the same mag- 

 nifying power as fig. 3. 

 Same leg, more higlily magnified. 

 Posteriijr end of body, seen from the left. 

 Tail, seen from Ijehind. 



Cerebral ganglion, with the nerves issuing from it, 

 and the ocellus, seen from the left, c, cerebral gan- 

 glion; opf, optic nerve; a', nerves for the 1st pair of 

 antennie; a', nerves for the oars; oc, ocellus; x, the 

 front ligament of the ocellus. 



Cerebral ganglion and compound eyes (0^, seen from 

 above, in. eye-muscles. The rest of tlie lettering as 

 in fig. 9. 



Ocellus, seen from the front. 

 Same, from liehind. 

 Same, fri>ni below. 



Part of the ventral ganglion chain, seen fnmi below. 

 An ovary from a very young animal. 

 X\\ o\ary from an older animal, soon after the eggs 

 from the follicles have entered the (Jvarial tube, x, 

 I ividuct. 



Piece of an ovary, with egg-folHcIes in different 

 stages of developinent. 

 Various egg-follicles, isolated. 



An egg taken out of the ovarial tulie. The shell 

 has just begun to form. 

 22. A complete egg with its capsule, seen in 3 diffe- 

 rent positions. 



Piece of one wing-like expansion of the egg-capsule, 

 highlv magnified. 



Plate XVII. 

 Limnadia lenticuJaris, fi.in.) 



: Development). 



X newly-hati'hed larva, seen from below, oc, ocellus; 

 a', 1st pair of antenna?; a', 2nd pair of ahtennæ 



L. labnnn; /, caudal 



Fit; 



1. 



2. 

 3. 



ot antenna?; a 

 'oars:; Mp, mandibular legs; 

 emargination. 



A larva after the 1st ('xuviation, seen from above. 

 An older larva, seen from below. 

 A later stage, in wliich the earliest rudiments of the 

 compound eyes, the carapace and the legs are dis- 

 tinguishable: seen from above. 

 Older larva, seen from below. 

 An antenna of the 1st pair, liighly magnified. 

 A somewhat later stage, seen from the left. Left 

 oar omitted. 



Last larval stage, seen from above. 

 Ycjung one in the last post larval stage, seen from 

 aliove. 

 Same, seen from the left. 



Plate XVIII. 

 Limnetis trachyurus, ^Mtill.) 



l'"ulIgrown, ovigerous female, seen from the U^ft. 



Same, from Ik'Iow. 



Full-grown male, seen from tlie right. 



Head of a female, seen from the front. 



