139 



5. irove<I('t af en Han i samme Stillinfi. 



0. Skallen af en Hun, nied Valvlernc t:et lukkc 



t'ra venstre SiiU". 

 7. Saunno ovenfra. 



Tab. XTX. 

 Limnetis brachi/nrus, :Mh11. 



scet 



Fijr. ]. 



ID. 



n. 



12. 

 l:i. 



14. 



1.5. 

 16. 



I,ri;emet af en I Inn ligfrenile i .>^in naturlip;e Situs i 

 hoire Valve); venstre ^■alvel borttajiet. h Hjertet; 

 nvs en af de ka^eforniige .Efrmasser. 

 En Foler af Iste Par. 



Kn af de jxia saniiiie fii-stcde Lu.<rte]ia|iiller, stjerkt 

 forstørret. 



Kn Foler af 2det I'ar Aare^. 



Mundrejrioneii sect nedenfra; Overheben horttagot. 

 M Kindbakkcrne; w' Iste I'ar Kjjever; m' 2det Par 

 Kj;ever; oes Spiseroret. 

 Kn Kjæve af Iste Par. 



Kn af de ]>a:i Spidsen af saniine fiestede Pigge, stærkt 

 forstorret. 



1mi Kja-ve af 2dct Par. 

 Haledelen seet fra venstre Side. 

 Samme nedenfra. 



Ilen bagre Del af Le.iremet seet ovenfra, fl de oni- 

 f ormede dorsale Lajipe af Kxopoditerne paa Ode og 

 lOdeFodpar; I de liladforniige dorsalePlader; u Hale- 

 tiigenc. 



Hjertet seet ovenfra. 



Det forreste -Vfsuit af Legemet af en lliiu, seet fra 

 «Mistro Side (Aarerne udeladte}. de sanimoiisatte 

 Oine; oe <let enkle Øie; p dettes forreste Ligament; 

 oi Sandsegruber; a; Fastheftningsorgan(?5; a' Iste Par 

 Følere; L (Iverheben; M Kindbakkerne; to' Iste Par 

 Kjsever; m' 2det Par Kjiever; ms Insertionsarea for 

 Skallens Dukkeinuskel ; /Tarmen: Iv Leveren. 

 Kn Sanilsegrube seet ovenfra. 



lljernegangliet med de fra samme udgaaende Nerver, 

 tilligemed de sammensatte (-)ine i^O) og elet enkle Øie 

 oe';, seet nedenfra; opt .Synsnerven; a' Xerver for 

 Iste Par Folere; a' Nerver for Aarerne. 

 Samme Del uden de sannnensatte Øine), seet fra 

 venstre Side. Bogstaverne som i>aa foregaaende 

 Figur. 



Det enkle Øie seet forfra. 

 Skalkjiertelen med JIuskelar(>aen. 



Fig. 



Fiir. 1. 



10. 

 11. 



12. 

 13. 



14. 



Head of a male, in the same position. 



Shell of a feinali'. with the valves elosely shut. .=een 



from the left. 



Same, from above. 



Plate XIX. 



Limnctis hrachyurus, iiiill.) 



]^ody of a femaK', lying in its natural jiosition in 

 the right shell; left valve removed, h, heart; ovs. 

 one of the oakelike egg-masses. 



!. An antenna of y\w 1st pair. 



! a. Øne of the olfactory papilla? on the same, highly 

 magnified. 



i. .\n antenna of the 2nd pair foarsi. 



L (Iral region, seen from below: labrum removed. 3/, 

 mandibles; »»'. 1st pair of maxillæ; m'. 2nd pair of 

 inaxilhe; oes, o'sophaprns. 



p. A maxilla of the 1st pair. 



lb. One of the spines at the end of the same, highly 

 magnilied. 



i. .\ maxilla of the 2nd pair. 



Caudal i)art, seen from the left. 



!. The same, from below. 



I. Posterior part of the body, seen from above. //, the 

 transformed dorsal lobes of the (-xopodites in the 

 9th and 10th iiairs of legs; I, the leaf-like dorsal 

 lamella-; ii. caudal lobes. 

 Heart, seen from above. 



.Vnterior part of the body of a female, seen from the 

 left. (Oars omitted). 0, compound eyes; oc, ocellus; 

 p, its frf)nt ligament; ol. sensory pits; x, affixing 

 organ ?"; a', 1st pair of antennæ; i, labrum; M, 

 mandibles; to', 1st pair of maxilhc; m', 2n(l jiair of 

 maxilla': ins, area of insertion of the ailduetor muscle 

 of the shell; /, intestine; Iv, liver. 

 -V sensory pit. seen from aljove. 



Cerebral ganglion with the nerves issuing from it, 

 and the compound eyes (0) and ocellus [oc^, seen 

 from below, opt, oi>tie nerve; a', nerves for the 1st 

 pair of antenna' ; a', nerves for the oars. 

 Same part without the compound eyes', seen from 

 the left. Letterin.g as in lig. IS. 



15. Ocellus, seen from tlu' front. 



16. Shell gland with muscular area. 



Tab. XX. 

 Limneti.i hrachyurns, Midi.; 



"ig. 1. i:n Fod af 3die Par hos Hunnen. 1 — 5 Kndopoditen 

 med sine Knditer; mx Coxallajipen; ex Exopoditens 

 ventrale La]); fx' dens dorsale Lap; ep Kpipoditen. 



-- la. I'^n af de til niestsidste Endit fa-steile Tnrne, sta-rkt 

 forstorret. 

 lb. ('oxallap])en isoleret, og seet fra den indre Side 



•- 2. Va\ Fod af 8de Par. 



3. i:n Fod at Ode Par. 



:! a. Knden af Kxopoditens dorsale Lap, sl:irkt f.irstorret, 



4. Kn Foil af lite Par. 



5. Kn Fod a f 12te sidste) Par. 



6. Legemet af en Han liggende i sin naturlige Situs i 

 venstre \'alvel hoire Valvel borttaget). 



7. V.n Fod af Iste Par hos Hannen. 



Fig. 1 



11 

 2^ 



3. 

 3 a 

 4. 

 6. 

 0. 



Plate XX. 



Limnetis brachj/urus, MiUl.' 



.V leg of the 3rd pair in the female, l—o, cnilopo- 

 dite, with its endites; mx, coxal lobe; ex, ventral 

 lobe of exopodite; ex', its dorsal lobe; ep, epipoilite. 

 a. One of the spines on the jienultimate eiidite. hiiihiy 

 magnilied. 



Coxal lobe isolated, and seen from the inside. 

 .V leg of the 8th pair. 

 A leg of the '.Ith i)air. 



Knd of dorsal lobe of exopodite, biirhly ma-jmilied. 

 A leg of the 11th pair. 

 A leg of the 12th last^ pair. 



Body of a male lying in its natural (losition in the 

 left valve right valve removed . 

 .V leg of the 1st pair in the male. 



