Fig. 
Fig. 
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1}. 
16%. 
19. 
Underleben med Spisergret, seet forfra. 
En Kjeeve af iste Par. 
En Kjeve af 2det Par; p Palpe. 
En Fod af 1ste Par. m Coxallappen; 1—5 Enditerne; 
ex Exopodit. 
En Fod af 2det Par. 
gaaende Figur. 
En Fod af 10de Par. 
En Fod af lite Par. 
sluttet eg. 
En Fod af 12te Par. 
En Fod af et af de bagerste Par ved samme For- 
storrelse. 
Samme Fod betydelig steerkere forstorret. 
En Fod af sidste Par; samme Forsterrelse som 
Fig. 19. 
Samme Fod sterkt forstorret. 
de foregaaende Figurer. 
Den bagre Del af Legemet med Halepladen og Basis 
af Haletraadene, seet ovenfra. 
Samme Del seet nedenfra. 
Sidste Segment, med Halepladen, af et ualmindelig 
stort Exemplar, seet oventfra. 
Samme Del af 2 andre Exemplarer, for at vise Varia- 
tionerne i Halepladens Form. 
Bogstaverne som paa fore- 
ov Agkapselen med et inde- 
Bogstayerne som paa 
Tab. XIII. 
Lepidurus glacialis, (Kroyer.) 
Dorsalt Vue af en Hun, paa hvilket Rygskjoldets 
frie Del er borttaget, for at vise de underliggende 
Dele, seet oyenfra. Ved lengere Tids Indlegning i 
Glycerin, er Legemet gjort halvt gjennemsigtigt, saa 
at de indre Organer delvis skinner igjennem. O de 
sammensatte Gine; oc det enkle Gie; a Postocular- 
knuden; M Kindbakkerne; p' Iste Fodpar; p" 1lte 
Fodpar med Aigkapslen; J Tarmrgret; / Leveren; 
¢ Hjertet; ov Ovarierne. 
Lateralt Vue af et andet Exemplar, paa hvilket ven- 
stre Halypart af Rygskjoldet er borttaget. a‘ Iste 
Par Folere; a* 2det Par Folere; L Overleben. De 
ovrige Bogstaver som paa Fig. 1. 
Endefliger af Leveren, steerkt forstorret. 
Skalkjeertelen. 
De sammensatte Mine, med det enkle Bie (oc) og 
Hjernegangliet (g), ovenfra seet. 
En Krystalkegle seet fra den ydre Ende. 
Et enkelt Synselement, med Forgreninger af Syns- 
nerven yed Basis. 
Postocularknuden. 
Et Stykke af Buggangliekjeedens forreste Del. 
Et andet Stykke lengere bagtil, samme Forstorrelse. 
Den bagre Ende af Buggangliekjeden, samme For- 
storrelse. 
Et Stykke af et Ovarium med paasiddende Aig- 
follikler. 
To af de mindste Agfollikler isolerede. 
To videre udviklede ®gfollikler. 
En endnu mere udviklet Agfollikel. 
Et modent ASg udtaget af Agkapselen. 
Et Stykke af A®gskallen, sterkt forstorret. 
Et Stykke af en Szdstok. 
Nogle Seedfollikler, steerkere forstorret. 
Seedelementer, meget steerkt forstorret. 
En Fod af 11te Par hos Hannen. 
Fig. 1. 
ve wees ve ee vee 
18. 
14. 
15. 
16. 
161, 
17. 
18. 
19. 
20. 
Posterior lip and esophagus seen from the front. 
A maxilla of the Ist pair. 
A maxilla of the 2nd pair. p, palp. 
A leg of the 1st pair. m, coxal lobe; 1—5, endites; 
ex, exopodite; ep, epipodite. 
A leg of the 2nd pair. Lettering as in fig. 14. 
A leg of the 10th pair. 
A leg of the 11th pair. 
an egg. 
A leg of the 12th pair. 
A leg of one of the hindmost pairs, magnified with 
the same power. 
Same leg, under a much higher magnification. 
A leg of the last pair; magnified with the same 
power as fig. 19. 
ov, egg-capsule, containing 
Same leg, highly magnified. Lettering as in the pre-— 
ceding figures. 
Posterior part of body with caudal lamella and base 
of caudal filaments, seen from above. 
Same part, seen from below. 
Last segment, with caudal lamella of an unusually 
large specimen, seen from above. 
Same part of 2 other specimens, to show variations 
in the shape of the caudal lamella. 
Plate XII. 
Lepidurus glacialis, (Kroyer.) 
Dorsal view of a female, seen from above, the free 
part of the carapace being removed to show the 
parts beneath. By being kept for some time in gly- 
cerine, the body has been rendered semi-transparent, 
so that the internal organs are partly visible through. 
O, compound eyes; oc, ocellus; x, post-ocular tubercle; 
M, mandibles; p', Ist pair of legs; p', 11th pair of © 
legs, with egg capsule; J, intestinal tube; J, liver; 
c, heart; ov, ovaries. 
Lateral view of another pisehuieth from wish the 
left half of the carapace is removed. a', 1st pair of 
antenne; a@*, 2nd pair of antenne; L, labrum; the 
rest of the lettering as in fig. 1. 
Terminal lobes of the liver, highly magnified. 
Shell-gland. 
Compound eyes, with the ocellus (0c) and cerebral 
ganglion (g), seen from above. 
A crystalline cone seen from the outer end. 
A single visual element, with ramifications of the 
optic nerve at the base. 
Post-ocular tubercle. 
Piece of the foremost part of the ventral ganglion 
chain. 
Another piece, farther back, same » athgdsbenbion. 
The posterior end of the ventral Senter: chain, same 
magnification. 
A portion of the ovary with a egg-follicles. 
Two of the smallest egg- follicles isolated. 
Two more developed egg-follicles. 
A still more developed egg-follicle. 
A mature egg removed from the egg-capsule. 
A piece of egg-shell, highly magnified. 
A piece of the testes. 
Some sperm-follicles, more highly magnified. — 
Sperm elements, very much magnified. © 
A leg of the 11th pair in the male. 
