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three bristles. Of the two joints of the endop o dite the proximal one is large and powerful;
the distal one is directed somewhat inwards, small, but rather powerful, armed with
mimerons powerful bristles (with the exception of the males of the sub-family Philomedinae).
With regard to the differences between the previous authors’ interpretations of the
different parts of this limb and t.hat which is followed in this work, see above p. 31.
Fifth limb: — Cf. fig. IY, p. 39. With or without sexual dimorphism. — It
is short, foliaceous and developed as a powerful masticatory organ. Exceptions are the males
of the sub-family Philomedinae, in which this, like the preeeding limb, is fitted with very
weak masticatory parts and in which it can certainly not be used for mastication of food. The
pro topodite is powerful, dominâtes somewhat over the exopodite, is united rather much
with the bodv, is generally only rather weakly divided into two or three joints and is directed
vertically. On the inner edge it is armed with three powerful,
although rather slightly projecting endites, one on the pro-coxale.
one on the coxale and one on the basale, all three of which are
armed with bristles. The marginal bristles of the e p i p o d i a 1
p 1 a t e most frequently diminish rather regularly in length
the more dorsally and ventrally they are fixed. The
exopodite is four- or five-jointed, directed obliquely backwards
and outwards. Its two proximal joints are powerful and serve
as masticatory organs, most frequently rather well defined
both from each other, from the protopodite and from the third
exopodite joint; on the inner edge both are furnished with a
greater or less number of more or less powerful bristles, the proximal one has in addition a
more or less powerful tooth, consisting of several constituent teeth placed in a row. The
folio wing exopodite joints generally differ very greatly in their structure from the two
preeeding ones, they are very slightly chitinized and take no part in the mastication of the food.
The fourth joint is deeply sunk in joint no. 3, so that the latter is divided into an outer and
an inner lobe, the connection of which is often to be seen only in rather young specimens; the
inner lobe is sometimes more or less reduced. The endopodite not developed.
With regard to the differences between the interpretation of the different parts of this
limb that have already appeared in the literature and the interpretation accepted in the present
work see above p. 37.
Sixth li mb: — Cf. fig. VII, p. 48. Without or with rather weak sexual
dimorphism. — It is always rather large y et rather moderately lengthened in the longitudinal
direction of the body, directed ventrally. It consistes of a rather well developed, more or less
obviouslv two- or three-jointed protopodite and a rather powerful exopodite; the
endopodite seems always to be lack in g. Protopodite: Armed on the anterior
edge with three endites, of which at least the two distal ones are well developed; one of these
is placed on the basale, the two others on the procoxale-coxale. The endites are furnished with
a varying number of bristles, most frequently rather powerful, some of which are placed
distally, some medially, generally somewhat more proximally (measuring from the top of the
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Kig. XXIV. Horizontal section of
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