124 



lerne synes til en vis Grad at være bevægelige, idet 

 2 tvnde Mnskler passerer til hver af dem ovenfra. 



Branchialføddernes Antal er, som ovenfor an- 

 ført, 12 Par. Af disse er de 3 forreste Par omtrent 

 af ens Længde, medens de ovrige hurtigt aftager i 

 Størrelse bagtil. Tab. XX, Fig. 1 fremstiller en 

 Fod af 3die Par seet fra den forreste Flade. Som 

 det vil sees, er Formen temmelig afvigende fra 

 samme hos Limnadia, skjondt man kan adskille de 

 samme Hoveddele. Endopoditen er idethele bredere 

 og mere pladeformig, og af Enditerne har knn de 

 2 inderste et lignende Udseende som dem hos Lim- 

 nadia, medens de 3 der])aa folgende er forlængede 

 til fingerformig indadrettede Fortsatser besatte i den 

 ene Kant med en dobbelt Rad af .stærke Borster. 

 Den yderste (5te) Endit er, som hos Limnadia, be- 

 vægeligt articnleret til Endopoditen og forestiller 

 egentlig dennes Endeled. Coxallappen (mx) er vel 

 udviklet og skraat indadrettet, visende adskillig 

 Lighed i Form med Endepladen af Iste Par Kjæver. 

 Den er imidlertid (se Fig. 1 1j) forsynet med et 

 større Antal Borster i den indre Kant, tildels ord- 

 nede i 2 Rækker. Yderkanten, har knn en enkelt 

 indadrettet Bor.ste nær Spidsen og er forøvrigt meget 

 fint cilieret. Epipoditen (ep) er af middels Storrelse 

 og viser en lignende Form og Structur som hos 

 Limnadia. Derimod har Exopoditen et temmelig 

 afvigende Udseende. Den er rigtignok ogsaa her 

 delt i en ventral og en dorsal Lap; men den ven- 

 trale Lap (ex), som hos Limnadia er den største, er 

 her kun tilstede som en forholdsvis ubetydelig, 

 smalt tilspidset Fortsats, kantet med lange, cilierede 

 Borster, medens den dorsale Lap (ex') er enormt 

 udviklet, dannende en bred, halvmaaneformigt krum- 

 met Plade, der rager hoit op over Kropsiderne (se 

 Tail. XIX, Fig. 1). Denne Plade har langs Yder- 

 kanten en tæt Rad af forholdsvis korte, men tæt 

 cilierede Borster og er ogsaa tildels borstebesat i 

 Inderkanten. Fra dens stumpt afrundede Ende lul- 

 gaar desuden en meget lang og tynd, ueilieret Børste. 



Af væsentlig samme Udseende som det ovenfor 

 beskrevne 3die Fodpar er ogsaa de 2 forreste og de 

 4 folgende Par, hvilke sidste dog gradvis aftager i 

 Størrelse. 



8de Fodpar (Fig. 2) skiller sig imidlertid, for- 

 lulen ved ringere Storrelse, meget væsentligt ved 

 den fuldstændige Mangel af Epipodit. Ligeledes er 

 Enditerne mere sammentrængte og mindre ulige, idet 

 de 2 bagerste er mere fremsiiringende, de 3 yderste 

 kortere end paa de foregaaende Par. Exopoditens 

 dorsale Lap er forsynet i Enden med flere lange, 

 divergerende Borster af samme Beskaffenhed som 

 den enkle apicale Børste paa 3die Par. 



obliterated. TIk^ lamellæ appear, to a certain extent 

 to be movable, as 2 thin musrdes pass to eaeh of 

 them from above. 



As stated above, the number of branchial legs 

 is 12 pairs. The 3 foremost of these are of about 

 uniform length, while the remainder rapidly diminish 

 in size towards the back. PI. XX, fig. 1, represents 

 a leg of the 3rd pair seen from the front. As will 

 be seen, the shape difl'ers not a little from that in 

 Limnadia^ although the same principal parts are 

 distinguishable. The endopodite is on the whole 

 broader and more lamellar; and only the innermost 

 endites have a similar appearance to those in Lim- 

 nadia, while the next 3 are elongated into digiti- 

 form, inward- pointing projections, clothed on one 

 edge with a double row of strong bristles. The 

 outermost (5th) endite, as in Limnadia, is movably 

 articulated, to the endopodite, really representing 

 the latter's terminal joint. The coxal lobe (mx) is 

 well developed, and directed obliquely inwards, and 

 exhibits a considerable resemblance in form to the 

 terminal lamella of the 1st pair of maxillæ. It is, 

 however (see fig. 1 h), furnished Avith a larger 

 number of bristles on the inner margin, arranged 

 to some extent in 2 i-ows. The outer margin has 

 only a single inward-directed bristle near the point, 

 and, in addition, is very finely ciliated. The epipo- 

 dite is of medium size, and exhibits a similarity in 

 form and structure to that of Limnadia. The exo- 

 podite, on the other hand, is rather different in 

 appearance. It is, indeed, here too, divided into a 

 ventral and a dorsal lobe; but the ventral lobe (ex), 

 which in Limnadia is the larger, here appears only 

 as a comi)aratively insignificant, narrowly-pointed 

 projection, edged with long ciliated bristles, while 

 the dorsal lobe (ex ') is enormously developed, for- 

 ming a broad, crescent-shaped curved lamella, which 

 extends far up over the sides of the body (see PI. 

 XIX, fig. 1). Along its outer margin this lamella 

 has a close row of comparatively short, but tlii(d<ly 

 ciliated bristles, and is also setous to some extent on 

 the inner margin. Tliere also projects from its bluntly 

 rounded end a very long, thin, unciliated bristle. 



The 2 foremost pairs of legs, and the 4 succed- 

 ing pairs are essentially of the same appearance 

 as the above-described 3rd pair, the 4 succeeding 

 pairs, however, diminishing gradually in size. 



The Sth pair of legs, however (fig. 2), besides 

 being distinguished by their smaller size, difier very 

 essentially in the total absence of an epipodite. The 

 endites too are more crowded together and less dissi- 

 milar, the 2 hind ones being more projecting, and 

 the 3 outer ones shorter than in the preceding pair. 

 The dorsal lobe of the exopodite is furnished at the 

 extremity with several long, divei'gent bristles of 

 the same appearance as the single apical bristle on 

 the 3rd ])air. 



