138 



Fis. 3. Ell Fod af Iste Par: 1 — 5 Endopoditen med sine Eii- 

 diter; ex Exopoditeii; ex^ dens dorsale Lap; ep Epi- 

 poditen; mx Coxallappen. 

 r 4. En Coxallap isoleret og stærkere forstørret, seet fra 

 Indsiden. 



5. En Fod af sidste : 23de) Par, ved samme Forstørrelse 

 som Fig. 3. 



6. Samme Fod, stærkere forstørret. 



7. Bagenden af Legemet, seet fra venstre Side. 



8. Halen seet bagfra. 



'.1. Hjernegangliet med de fra samme udgaaende Nerver 

 og det enkle Oie, seet fra venstre Side. c selve Hjerne- 

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

 lere; a^ Nerver for Aarerne ; oe det enkle Øie ; x det- 

 tes forreste Ligament. 



10. Hjernegangliet tilligemed de sammensatte Øine (0), 

 seet ovenfra, m Øieinuskler. De øvrige Bogstaver 

 som paa foregaaende Figur. 



11. Det enkle Øie seet forfra. 



12. Samme bagfra. 



13. Samme nedenfra, 



14. En Del af Buggangliekjæden, seet nedenfra. 



15. Et Ovarium af et ganske ungt Indi^åd. 



lU. Et Ovarium af et ældre Indivdd, kort efter at Æg- 

 gene fra FoUiklerne er indkommen i Ovarialrøret. 

 x Æglederen. 



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

 forskjellig l^dvikling. 



18. Foi-.«kjellige Ægfollikler, isolerede. 



10. Et Æg udtaget af Ovarialrørene. Skallen har iietoi) 

 • begyndt at danne sig. 

 ." 20 — 22. Et fuldf;erdigt Æ.g med sin Kapsel, seet i 3 for- 

 skjellige Stillinger. 

 23. Et Stykke af den ene vingeformige rdvidiiing af 

 Ægkapselen, strerkt forstørret. 



Tab. XVn. 

 Lininadia lenticular is, Lin.) 



(Udvikling). 



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

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

 (Aarerne); Mp Mantlibularf ødderne ; L Overlteben; 

 f Haleindsnittet. 



2. En Larve efter Iste Hudskiftning, ovenfra seet. 



3. .Eldre Larve seet nedenfra. 



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

 de sammensatte Øine, Eygskjoldet og Fodderne kan 

 adskilles, seet ovenfra. 



5. Ældre Larve, seet nedenfra. 



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



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

 stre Aare er udeladt. 



7. Sidste Larvestadium, ovenfra seet, 



8. Un.ge i Iste postlarvale Stadium, seet ovenfra. 



0. Samme seet fra venstre Side. 



Tab. XVni. 



Linmetis hrachyurus, (Mull.) 



F"ig. 1. Fuldvoxen, fegbærende Hun, seet fra venstre Side. 



2. Samme nedenfra. 



3. Fultlvoxen Han, seet fra høire Side. 



4. Hovedet af en Hun, seet forfra. 



10 



> 11. 



. 12. 



» 13. 



. 14. 



.' 15. 



. 16. 



17. 



18. 

 19. 



Fig. 3. -V leg of the 1st pair; 1 — 5, endopodite -n-ith its en- 

 ilites; ex, exopodite; ex', dorsal lobe of the latter; 

 ep, epipodite; mx, coxal lobe. 



s 4. A coxal lobe isolated and more liighly magnified, 

 seen from inside. 

 o. A leg of the last (23rd) pair, under the same mag- 



nifj'ing power as fig. 3. 

 0. Same leg, more highly magnified. 



3 7. Posterior end of body, seen from the left. 



» 8. Tail, seen from beliind. 



s 9. Cerebral gangli(jn, with the nerves issuing from it, 

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

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

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

 front ligament of the ocellus. 



Cerebral ganglion and compound eyes (0), seen from 

 above, m, eye-muscles. The rest of the lettering as 

 in fig. 9. 



Ocellus, seen frcjiu the front. 

 Same, from behind. 

 Same, froni below. 



Part of the ventral gangUon chain, seen from below. 

 An ovary from a very young animal. 

 An ovary from an older animal, soon after the eggs 

 from the follicles have entered the ovarial tulie. x, 

 oviduct. 



Piece of an ovary, with egg-follicles in different 

 stages of development. 

 Various egg-follicles, isolated. 



An egg taken out of the ovarial tube. The shell 

 has just begun to form. 

 20—22. A complete egg with its capsule, seen in 3 diffe- 

 rent positions. 

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

 highly magnified. 



Plate XVII. 



Limnadia lenticidaris, (Lin.) 



(Development). 



Fig. 1. A newly-hatched larva, seen from below, oe, ocellus; 

 a', 1st pair of antennæ; a", 2nd pair of antennæ 

 (oars); Mp, mamlibular legs; L, labrum; f, caudal 

 emargination. 



2. A larva after the 1st exuviation, seen from above. 



3. Xi\ older larva, seen fr-om below. 



4. A later stage, in wliich the earliest rudiments of the 

 compound eyes, the carapace and the legs ave dis- 

 tinguishable: seen from above. 



5. Older larva, seen from below. 



6 a. An antenna of the 1st pair, highly magnified. 



6. X somewhat later stage, seen from the left. Left 

 oar omitted. 



7. Last larval stage, seen from above. 



8. Young one in the last post-larval stage, seen from 

 above. 



9. Same, seen from the left. 



Plate XVni. 



Limnetis hrach/urus, ;Mflll.) 



Fig. 1. Full-grown, ovigerous female, seen from the left. 



» 2. Same, from below. 



\i. Full-grown male, seen from the right. 



4. Head of a female, seen from the front. 



