328 Merrill—Structure and Affinities of Bunops Scutifrons. 
and two in a proximal row, one in each lobe. The anterior 
seta of the inner row stands between the two anterior setae of 
the distal row, and the posterior one, anterior to the three 
distal setae of the second lobe. The third lobe has two setae 
while two other setae arise from the side of the leg directly. These 
setae are ciliated on both sides, except the second three of the 
distal row, which have cilia on the anterior side only. The 
entire leg, particularly the anterior part, is covered with lines 
of cilia. The leg agrees in this respect with that of Macrothrix y 
but in the number and arrangement of setae it agrees more 
nearly with Acantholeberis , while it is even more like Ophryoxus 
or even the Lynceid Leydigia australis described by Sars.* 
SECOND LEG. 
PI. XV, Fig. 2. 
The second leg is much shorter than the first, and somewhat 
broader. The exterior ramus ( e) is here developed into a nar¬ 
row delicate lobe, bearing one slender seta on its distal end, 
and covered with numerous fine hairs. The inner branch (i) 
shows indications of the same lobing as the first leg, but so- 
much slighter, that it practically constitutes one rectangular 
plate. The setae are arranged in two rows as in the first leg.. 
The distal row consists of nine stout bi-articulate setae. The 
two exterior ones are longer and more slender than the others, 
and have cilia on the posterior edge only. They resemble the 
two anterior setae of the first leg. The seven following are 
graduated in length from first to last. The distal joint of the 
first six is set with delicate close-set plates, making a comb-like 
structure, instead of setae, and the joint is curved. The 
proximal joints have very fine cilia. The seventh seta has 
cilia and no plates. It is much straighter than the others. The 
proximal row of setae consists of three, borne in two small lobes 
The anterior lobe bears two small, smooth setae, while the pos¬ 
terior lobe has but one seta. The maxillary process is well 
* Sars, G. O., On some Australian Cladocera raised from dried mud, 
Christiania Videnskabs-Selskabs Forhandlinger, 1885, pp. 39-41, PI. VIII,. 
Figs. 2-6. 
