94 



(jie Tab. XVI, Fig. 3) Formen af nedadrettede atiaiige, 

 uoget buede og uregelmæ.ssigt fligede Plader, hvis 

 convexe Side vender fortil, den concave bagtil, og 

 som i Kanterne er rigeligt borstebesatte. Man kan 

 paa dem adskille de samme 3 Hoveddele som hos 

 andre Branchiopoder, nemlig Endopodit, Exopodit og 

 Epipodit. Endopoditen, eller den egentlige Stamme, 

 har ved Basis indad en meget tydeligt sondret 

 Coxallap (mx) af temmelig compliceret Bygning (se 

 Fig. 4). Den er noget skraat indadrettet, af stumpt 

 konisk Form og meget rigeligt forsynet med Bør- 

 ster. Ved Spidsen har den 2 korte Pigge, og en lig- 

 nende Pig fiudes ogsaa paa den indre Side. Fra 

 denne sidste Pig strækker sig en noget skraat 

 løbende Rad af lange, leformigt indad krummede 

 Børster, der alle er tydeligt 2-leddede og fint cili- 

 erede. En' anden Rad af cilierede Børster strækker 

 sig langs den ydre Kant af Coxallappen, men disse 

 Borster er ikke leformigt krummede og aftager hur- 

 tigt i Længde mod Spidsen. Umiddelbart ovenfor 

 dem udgaar fra Yderkanten en noget stærkere, 

 skraat indadrettet Børste. Den indre Kant af En- 

 dopoditen er ved smaa Indsnit delt i 4 korte og 

 brede Lappe (Enditer), der bærer en dobbelt Rad af 

 fint cilierede Borster, hvoraf de i den ene er sær- 

 deles lange, tydeligt 2-leddede og bagudboiede. Den 

 yderste af disse Lappe er noget mere fremspringende 

 end de øvrige, og til dens ydre Side er articuleret 

 en smal tungeformig Lamelle, rundt om besat med 

 cilierede Borster. Denne Lamelle forestiller den 

 yderste (5te) Endit, eller Endopoditens Endeled, det 

 eneste tydeligt begrændsede Led paa Foden. Epi- 

 poditen (ep) har Formen af et aflangt ovalt, noget 

 sækformigt Appendix, uden ethvert Spor af Borster. 

 Den er fæstet til Ydersiden af Endopoditen i en 

 kort Afstand fra dennes Basis og rettet lige opad 

 over Siderne af Kroppen (se Tab. XV, Fig. 1). 

 Exopoditen (ex), der \id.springer med en bred Basis 

 ligeledes fra Ydersiden af Endopoditen og umiddel- 

 bart nedenfor Epipoditen, er af betydelig Størrelse 

 og delt i 2 smale i forskjellig Retning udgaaende 

 Lappe, en ventral og en dorsal. Den ventrale Lap 

 rækker omtrent til Spidsen af Endopoditens Ende- 

 lamelle, og er ligesom denne rundtom kantet med 

 cilierede Borster. Den dorsale Lap (ex') er betyde- 

 lig mindre end den ventrale, neppe overragende 

 Epipoditen, og er borstebesat alene i den ydre Kant. 

 Paa 9de til Ilte Fodpar er imidlertid hos fuldt ud- 

 viklede Individer (se Tab. XV, Fig. 1) denne Lap 

 udtrukket til en meget lang traadformig Fortsats, 

 der rager op i Skallens dorsale Cavitet, hvor den 

 tjener til Fæste for den her sig ansamlende Æg- 

 masse. 23de eller sidste Fodpar (Fig. 5, 6) skiller 

 sig i visse Henseender kjendeligt tra de øvrige. Det 

 er særdeles Hdet og har Endopoditen gan.ske kort, 

 med kun 3 Lappe indad, foruden Coxallappen. Bør- 

 sterne paa disse Lappe, saavelsom paa det korte. 



difficult to count. They all (see Pl. XVI, fig. 3) 

 have the shape of down-pointing, oblong, somewhat 

 curved, and irregularly lobed laminæ, whose convex 

 side turns to the front, the concave to the back, 

 and whose edges are thickly clothed with bristles. 

 The same 3 principal parts can be distinguished in 

 them as in other Branchiopods, namely, endopodite, 

 exopodite and epipodite. The endopodite, or stem 

 proper, has on the inner side of the base a very 

 distinctly-defined coxal lobe of rather complicated 

 structure (see fig. 4). It is directed rather obliquely 

 inwards, is of a bluntly conical shape, and abun- 

 dantl}^ provided with bristles. At the point it has 

 two short .spines, and a similar spine is also found 

 on the inner side. From this last-mentioned spine, 

 runs a rather obliqi;e row of long, falciformly 

 incurved bristles, all distinctly 2-jointed and finely 

 ciliated. Another row of ciliated bristles runs along 

 the outer edge of the coxal lobe, but these are not 

 falciformly curved, and they rapidlj- decrease in length 

 towards the point. Immediateh' above them, there 

 issues from the outer edge a somewhat stronger 

 bristle, directed obliquely inwards. The inner edge 

 of the endopodite is divided by small indentations 

 into 4 short, broad lobes (endites) carrying a double 

 row of finely ciliated bristles, which in one row are 

 particularly long, distinctly 2-jointed, and bent back- 

 wards The oiitermost of these lobes is rather more 

 projecting than the others, and to its outer side is 

 articulated a narrow lingular lamella, edged all 

 round with ciliated bri.stles. This lamella represents 

 the outermost (5th) endite, or the terminal joint of 

 the endopodite, the only distinctly defined joint in 

 the leg. The epipodite (ep) is in the shape of an 

 oblong oval, somewhat sac-like appendage, with no 

 trace of bristles. It is attached to the outer side 

 of the endopodite at a short distance from its base, 

 and is directed straight upwards over the sides of 

 the body (see PI. XV, fig. 1). The exopodite (ex), 

 which issues with a broad base also from the outer 

 side of the endopodite, and immediately below the 

 epipodite, is of considerable size, and is divided into 

 2 narrow lobes, one ventral and one dorsal, pro- 

 jecting in oppo-site directions. The ventral lobe 

 reaches almost to the point of the terminal lamella 

 of the endopodite, and is likewise edged all round 

 with ciliated bristles. The dorsal lobe (ex') is con- 

 siderabl}' smaller than the ventral, scarcely reaching 

 beyond the epipodite, and is edged with bristles J 

 only on the outer margin. On the 9t]i, lOth and 

 11th pairs of legs in fully-developed specimens, how- 

 ever (see PI. XV, fig. 1), this lobe is drawn out to 

 a very long filiform projection, which extends up 

 into the dorsal cavity of the shell, where it serves 

 as an attachment for the accumulated egg-mass i 

 there. The 23rd or last pair of legs (figs. 5 and (3) 

 is conspiciiously distinguished in certain respects 



