136 



yi'_'. U. t'liiU'i'lii'licn med Spigerorct, scet forfra. 



12. I''.u Kj;vvf ;if Istu Par. 



13. ICu Kjæve af 2flet Par; p Pali>e. 



14. Kn Fod af IstePar. /» Coxallap]H'n ; 1— 5 Emliternt'; 

 ex Exoportit. 



15. Kn Fod af 2d('t Par. Boiistavi'riu' snm jiaa fore- 

 gaaende Figur. 



16. Kn Fod af lOde Par. 



17. En Fod af lite Par. nv .Ktrkapselen nied et inde- 

 j^luttet Æg. 



, 18. En Fod af 12te Par. 



19. En Fod af et af de l)af;er.ste Par vi'd sanune For- 

 storrelt^e. 



20. Sannne Fod lietydelig sta^rkere forstørret. 



21. En Fod af .'sidste Par; samme Forstørrelse som 

 Fig. 19. 



22. Samme Fod stærkt forstorret. Biigstaverne som paa 

 de foregaaende Figurer. 



23. Den bagre Del af Legemet med Haleiiladcn og Basis 

 af Haletraadene, seet ovenfra. 



24. Samme Del seet nedenfra. 



25. Sidste Segment, med Halepladen, af et nalmindelig 

 stort Exemplar, seet ovenfra. 



2G. Samme Del af 2 andre Ext'mjilarer, for at vise Varia- 

 tionerne i llaleplailens Form. 



Tab. XIII. 

 Lepidurus glacialis, sKrøyer.) 



Fig. 1. Dorsalt \\\r af en Hun, ]jaa livilket Pygskjoldets 

 frie Del er Ijorttaget, for at vise de umlerliggende 

 Dele, seet ovenfra. Vim! In-ngere Tids Indhegning i 

 Olyeerin, er Legemet gjort halvt gjennemsigtigt, saa 

 at de indre Organer delvis skinner igjennem. de 

 sannnensatte Oine; oe det enkle Øie; x Postocnlar- 

 kmiden; 3f Kindbakkerne; p' Iste Fodpar; 73" Ilte 

 Fodpar med Ægkapslen; I Tarmroret; I Leveren; 

 c. Hjertet; ov Ovarierne. 



2. Lateralt Vue af et andet Exemplar, paa hvilket ven- 

 stre Halvpart af Rygskjoldet er liorttaget. «' Iste 

 Par Følere; a' 2det Par Fulere; L Overheben. De 

 ovrige Bogstav(^r som paa Fig. 1 



3. Endetliger af Leveren, stærkt forstørret. 



4. Skalkjærtelen. 



I 5. De sammensatte Øine, med det enkle Oie ipc) og 

 Iljernegangliet ig), ovenfra seet. 



5. lOn Krystalkegle seet fra den ydre F^nile. 



7. Et enkelt Synseleinent, med Forgreninger af Syns- 

 nerven ved Basis. 



8. 1'ostoenlarknuden. 



9. Et Stykke af lUiggangliekjiedens forreste Del. 



10. I-;t andrt Stykki' lirngei'e Ijagtil, sannne Forstørrelse 



11. Den liagre Kiide af Buggangliekjieden, sannne For 

 størrelse. 



12. Kt Stykke af et Ovarium mi'd paasiddende Æg- 

 follikler. 



13. To af de luindste .EgfolHkler isoleri'de. 



14. To villere udviklede /Egfollikler. 



15. Va\ endini mei-e ndviklet Ægfolliki'l. 



16. VA, modent Æg ndtaget af Ægkapselen. 

 16'. Et Stykke af .Egskallen, slaTkt forstørret. 



17. Kt Stykke af en Sa-dstok. 



18. Nogle Siedfollikler, stærkere forstørret. 



19. Siedelenienter, meget stierkt forstørret. 



20. F;n F(jd af Ilte 1'ar hos Hannen. 



.11. Posterior lip ami lesophagns seen from the front. 



12. A maxilla of the 1st ])air. 



13. A maxilla of the 2n<l pair. p, pal]). 



14. A leg of thi' 1st pair. m. eoxal lobe; 1 — 6, endites; 

 ex, 1'xopodite; ep, epi]>odite. 



15. A leg of tlie 2nd pair. Lettering as in fig. 14. 



16. A leg of the lOth pair. 



17. A leg of the llth iiair. ov. egg-eapsule. eontaining 

 an egg. 



18. A leg of the 12th pair. 



10. A leg of ont' of the hindmost pairs, uiagnitied with 

 the same power. 



20. Same leg, under a much liigher magnitieation. 



21. \ leg of the last jiair; magnified with the same 

 Ijower as tig. 19. 



22. Same leg, highly magnified. Lettering as in the pn'- 

 ceding figures. 



23. Posterior part of body witli eaudal lamella and base 

 of caudal filaments, seen from above- 



24- Same part, seen from lielow. 



25. Last segment, with eaudal lamella of an unusually 

 large specimen, seen from above. 



26. Same part of 2 other specimens, to show variations 

 in the shape of tlu' eaudal lamella. 



Plate XIII. 



LepicTnvKS ylaciidis, Kroyer.) 



Fig. 1. Dorsal \iew of a female, seen from al.iove, the free 

 part of the carapace being remi.ived to show' the 

 parts beneath. By being kejit for some time in gly- 

 cerine, the body has been rendered semi-transpareut, 

 so that the internal <irgans are jiartly visible through. 

 0, compound eyes; oc, ocellus; a', post-ocular tubercle; 

 M, mandibles; 2>\ 1st pair of legs; ^ ", llth pan- of 

 legs, with egg capsule; /, intestinal tube; I, liver; 

 c, heart; ov, ovaries. 

 2. fjateral view of another spi'cimeu from wliieh the 

 left half of the carapace is removed, a', 1st pair of 

 antenna''; a^, 2nd pair of antennse; L, labrum; the 

 rest of the lettering as in fig. 1 . 



» 3. Terminal lobes of the liver, highly niagnitii'd. 



» 4. Shell-gland. 



» 5. Componnil eyes, with the ocellus oc and cerebral 

 ganglion </ , seen from above. 



6. A crystalline cone seen from the outer end. 



7. A single visual element, with ranntications of the 

 optic nerve at the base. 



8. Post-ocular tubercle. 



9. Piece of the foremost part of the ventral ganglion 

 chain. 



10. Another jiieee, farther liaeU, same uiagnilicatiou. 



11. The jiosterior end of the ventral ganglion cluun, same 

 magnification. 



i 12. .\ portion of till' ovary with its egg-follich'S. 



13. Two of the smallest egg-follicles isolated. 



14. Two more developed egg-follicles. 



15. A still more developed egg-follicle. 



Hi .\ mature egg removed from the egg-capsule. 



16'. A piece of egg-shell, highly magnilii'd. 



' 17. A jneee of the testes. 



» 18. Some sperm-follicles, more highly magnified. 



19. Sperm elements, very nmch magnified, 



•20. A leg of the llth ].air in the male. 



