EUTERPR. 23 
very small and armed with a long, curved, apical claw, 
the whole forming a powerful prehensile organ. The 
posterior antennz are 3-jointed and rather large, the 
basal joint giving attachment to an accessory branch 
composed of a single joint, which is smaller in the 
female than in the male (fig. 4); in the latter sex it is 
armed at the apex with a falciform claw, which, accord- 
ing to Claus, is used as an auxiliary clasping organ. 
The mandibles (fig. 5) are short and stout, strongly 
toothed, and bearing a short 2-branched palp. The 
maxille (fig. 6) are strongly toothed, and have a 2- 
jointed clawed palp. The upper foot-jaw (fig. 7) bears 
three marginal digits, which, as well as the terminal 
seement, are provided with plumose sete; the lower 
(fig. 8) is exceedingly long and slender, 3-jointed, with 
a very long curved claw at the apex. The swimming- 
feet of the first pair are 2-branched, each branch con- 
sisting only of two joints; and in the male (fig. 9) the 
inner branch is sharply flexed, the terminal joints of 
both branches bear on the inner margin and at the 
apex five long, finely-plumose setz, but neither of 
them possesses a prehensile claw. The three follow- 
ing pairs of feet have both branches 3-jointed, the 
inner branch, however, being in each. case much 
shorter than the outer (figs. 10, 11, 12); all the sete 
of these limbs are plumose, but those belonging to the 
first joint much more strongly so than the rest. The 
fifth foot in the female is foliaceous, elongated, subovate 
(fic. 13), bearing at the broad apex five spines, of which 
thesthree median ones are plumose; on the middle of 
the external margin there is also a spine of nearly 
