Fig. 
3. 
10. 
11. 
12. 
13. 
14. 
15. 
16. 
ay 
18. 
19. 
En Fod af 1ste Par; 1—5 Endopoditen med sine En- 
diter; ew Exopoditen; eat dens dorsale Lap; ep Epi- 
poditen; ma Coxallappen. 
En Coxallap isoleret og steerkere forsterret, seet fra 
Indsiden. 
En Fod af sidste (23de) Par, ved samme Forstorrelse 
som Fig. 3. 
Samme Fod, stzrkere forstorret. 
Bagenden af Legemet, seet fra venstre Side. 
Halen seet bagfra. 
Hjernegangliet med de fra samme udgaaende Nerver 
og det enkle Mie, seet fra yenstre Side. ¢ selye Hjerne- 
gangliet; opt Synsnerven; a' Nerver for lIste Par Fo- 
lere; a? Nerver for Aarerne; oc det enkle Mie; x det- 
tes forreste Ligament. 
Hjernegangliet tilligemed de sammensatte @ine (0), 
seet ovenfra. m Qiemuskler. De ovrige Bogstaver 
som paa foregaaende Figur. 
Det enkle Mie seet forfra. 
Samme bagfra. 
Samme nedenfra, 
En Del af Buggangliekjeeden, seet nedenfra. 
Et Ovarium af et ganske ungt Individ. 
Et Ovarium af et xldre Individ, kort efter at Ag- 
gene fra Folliklerne er indkommen i Ovarialrgret. 
a glederen. 
Et Stykke af et andet Ovarium, med A%gfollikler i 
forskjellig Udvikling. 
Forskjellige Agfollikler, isolerede. 
Et Ag udtaget af Ovarialrorene. 
begyndt at danne sig. 
Skallen har netop 
20—22. Et fuldfeerdigt AZ{g med sin Kapsel, seet i 8 for- 
Fig. 
23. 
skjellige Stillinger. 
Et Stykke af den ene vingeformige Udvidning af 
Agkapselen, steerkt forstorret. 
Tab. XVII. 
Limnadia lenticularis, (Lin.) 
(Udvikling). 
En netop udklekket Larve, seet nedenfra. oc det 
enkle Gie; @! 1ste Par Folere; a* 2det Par Folere 
(Aarerne); Mp Mandibularfodderne; Z Overleben; 
f Haleindsnittet. 
En Larve efter iste Hudskiftning, ovenfra seet. 
Eldre Larve seet nedenfra. 
Et senere Stadium, paa hvyilket det forste Anleg til 
de sammensatte Oine, Rygskjoldet og Fodderne kan 
adskilles, seet ovenfra. 
ZEldre Larve, seet nedenfra. 
En Feler af 1ste Par, steerkt forstgrret. 
Et noget eldre Stadium, seet fra venstre Side. 
stre Aare er udeladt. 
Sidste Larvestadium, ovenfra seet. 
Unge i iste postlarvale Stadium, seet ovenfra. 
Ven- 
Samme seet fra venstre Side. 
Tab. XVIII. 
Limnetis brachyurus, (Mill.) 
Fuldyoxen, «gberende Hun, seet fra venstre Side. 
Samme nedenfra. : 
Fuldyoxen Han, seet fra hgire Side. 
Hovedet af en Hun, seet forfra. 
Fig. 3. <A leg of the Ist pair; 1—5, endopodite with its en- 
dites; ex, exopodite; ex', dorsal lobe of the latter; 
ep, epipodite; ma, coxal lobe. 
» 4, A coxal lobe isolated and more highly magnified, 
seen from inside. 
» 5. <A leg of the last (23rd) pair, under the same mag- 
nifying power as fig. 3. 
» 6. Same leg, more highly magnified. 
» %. Posterior end of body, seen from the left. 
»  §8. Tail, seen from behind. 
» 9. Cerebral ganglion, with the nerves issuing from it, 
and the ocellus, seen from the left. ¢, cerebral gan- 
glion; opt, optic nerve; a‘, nerves for the 1st pair of 
antenne; a*, nerves for the oars; oc, ocellus; x, the . 
front ligament of the ocellus. 
» 10. Cerebral ganglion and compound eyes (0), seen from 
above. m, eye-muscles. The rest of the lettering as 
in fig. 9. 
>» 11. Ocellus, seen from the front. 
» 12. Same, from behind. 
>» 13. Same, from below. 
>» 14. Part of the ventral ganglion chain, seen from below. 
>» 15. An ovary from a yery young animal. 
>» 16, An ovary from an older animal, soon after the eggs 
from the follicles have entered the ovarial-tube. a, 
oviduct. ; 
>» 17. Piece of an ovary, with egg-follicles in different 
stages of development. 
» 18. Various egg-follicles, isolated. . 
» 19. 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. 
» 283. Piece of one wing-like expansion of the egg- pig vans. 
highly magnified. 
Plate XVII. 
Limnadia lenticularis, (Lin.) 
(Development). 
Fig. 1. A newly-hatched larva, seen from below. oc, ocellus; 
a‘, 1st pair of antenne; a?, 2nd pair of antenne 
(oars); Mp, mandibular legs; LZ, labrum; f, caudal 
emargination. 
>» 2. <A larva after the Ist exuviation, seen from aboye. 
» 8. An older larva, seen from below. 
>» 4. A later stage, in which the earliest rudiments of the 
compound eyes, the carapace and the legs are dis- 
tinguishable: seen from above. 
» § Older larva, seen from below. 
» 6a. An antenna of the 1st pair, highly magnified. 
» 6, A somewhat later stage, seen from the left. Left 
oar omitted. 
» 7 Last larval stage, seen from above. 
>» § Young one in the last post-larval stage, seen | from: 
above. ; 
>» 9, Same, seen from the left. 
Plate XVIII. 
Limnetis brachyurus, (Mill.) 
Fig. 1. Full-grown, ovigerous female, seen from the left. 
>» 2. Same, from below. 
>» 3. Full-grown male, seen from the right. 
> 4 
Head of a female, seen from the front. _ 
