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more or less clearly in wreaths and are more or less strongly pectinated distally. Proximally on
the ontside of the third masticatory process there is usually a single bristle. The coxale often
has dorsally a lamelliform epipodial appendage, often fine-haired, and distally of
this often a single bristle. On the boundary between the protopodite and the endopodite there
are often some bristles to be found: one placed just close by the exopodite, one at about the
middle of the inside of the endopodite and one on the anterior edge of the latter; sometimes
a somewhat larger number of bristles is developed at this place. Exopodite: This branch
is most frequently to be found at its original place, distally-laterally on the basale, seldom (in
the sub-genus Cypridinodes) displaced distally. E ndopodite: The first joint is generally
of moderate length, but very broad and rather strongly compressed laterally-medially (the
limb is thouglit of as turned straight outwards). Its posterior edge is most frequently more
or less strongly chitinised distally, often more or less projecting and forming a sort of cutting
edge; the shape of this part varies somewhat both in different species and within eacli species,
so that it is scarcely suited for the characterization of species. Distally this joint has some
bristles both on the anterior and the posterior edge, often two on the anterior and two or three
on the posterior. The small end joint is often rather strongly chitinized and armed with a rather
large number of bristles. In most of the species of this gro up that I have had an opportunity of closely
investigating these bristles showed such strong agreement both in number and situation that it
ought to be possible to carry out a pretty certain homologization of them in the different forms.
In most species 13 bristles were found, placed as follows: One group, whose bristles (often four
in number) form a transverse row, is found on the outside of the joint, somewhat towards the
back; its bristles are most frequently of moderate strength and diminish somewhat in length
towards the anterior edge of the joint; they are also but weakly or else not at all armed. The
other bristles are situated more or less distinctlv along the distal edge of the joint and are very
different from each other in size and type in the different species; within each species they show,
however, a rather great constancy, so that fairly good classificatory characters may be obtained
from them. In most species some of them at least are developed into very powerful masticatory
bristles. A group of these bristles is placed distally-anteriorly on the joint; it consists most
frequently of three bristles. Distally-medially on the joint somewhat behind this group there
is another group; it too has in most cases three bristles. Finally, posteriorly-distally on the
joint, usually somewhat laterally to the last-mentioned group, there is a third group of three
bristles, generally including the most powerful masticatory bristles of thisjoint. While the first group
mentioned is comparatively isolated, the three latter groups are at no great distance from each
other, on the contrary they are in most species rather close to each other, sometimes (as, for
instance, in the sub-genus Cypridinodes, see below) even so close to each other that I could
carry out homologization only with the greatest hésitation.
F i f t h limb*: — Without sexual dimorphism or at least the dimorphism is extremely
weak, scarcely noticeable. — The protopodite: The first masticatory process is armed
with a somewhat varying number of bristles: 5—14 (generally 7—9) were found in the species
* It is to be noted that in the description, for practical reasons, this limb is always thought of as pointing straight
outwards, whereas in the natural position of rest it points obliquely outwards and backwards.
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