Birge—Notes on Cladocera. 
1039 
united with the exopodite and hears three unequal setae. 
The inner branch is much larger and shows two lobes; 
the outer (e') has four setae, of various type, on its edge; 
or rather, they do not stand exactly on the edge but 
alternately more to the anterior and posterior faces. The in¬ 
nermost lobe (e") has three long setae on its edge and three 
more on the inner margin; the proximal seta of the last set 
turns toward the body. (See PL LXXI, fig. 1.) Besides 
these there are two small setae on the inner face of the 
endopodite; one lies just about at the junction of the two 
lobes of the inner branch, and is sometimes very short, as shown 
in PL LXIX, fig. 5; in other specimens the outer joint is 
longer and plumose. The other seta is smaller and is placed 
close to the insertion of the three lateral setae of the innermost 
lobe. There is no maxillary process. A small oval branchial 
sac (ep) is present, in which respect this species differs from 
TP. pannonica. 
The various interpretations of the first foot are as follows. 
In order to give in brief space a conspectus of opinion I have 
employed the notation of my figures and have indicated to 
which part of the typical appendage each is assigned by vari¬ 
ous authors. Thus in Iheringula, Sars assigns to the maxil¬ 
lary process the parts which I have marked e, e' e", and called 
endopodite. I do not employ in the table the lettering used 
by the authors mentioned, but there will be no difficulty m 
understanding their figures, if these are referred to. I make 
no mention of epipodite, or gill-sac, as there is no difference' 
of judgment regarding this part. 
Author. 
Beference. 
Genus. 
Exopo¬ 
dite. 
Endopodite. 
;M axillary 
process. 
Birge. ’09_ 
Lund, ’71.... 
Merrill, ’93... 
Dad ay, ’03... 
Sars, ’00. 
Sars, ’04—.. 
Lilljeborg,’00 
PI. LXX, fig. 2. 
D. 156: PI. IX. fig. 5. 
p. 326: Pl. XV. fig. 1. 
p. 69; PI. V, fig. 15. 
p. 14: PI. II, fig. 6. 
p. 8; fig. 10. 
p. 313, PI. LI, fig. 9. 
Wlassicsia. 
Macrothrix 
Bunops .... 
Wlassicsia. 
Iheringula. 
Saycia. 
Ophryoxus. 
d 
absent 
absent 
d 
d 
d+e 
d 
e+e'+e" 
d'+e+e'+e" 
d+e'+e'+e" 
e+e'+e" 
absent 
e'+e” 
e+e'+e” 
absent 
absent 
absent 
absent 
e'+e'+e'” 
absent 
present 
In the second foot (Pi. LXX, fig. 3) the exopodite (d) is a 
thin, transparent lamella, bearing a long, slender seta and 
