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Polycope setigera n. sp.
Description: — Shell: — Length: 0,70 mm. S e e n from the side it is almost
circular (see the appended fig. 1) and has an extremely small ventrally pointing spine at about
the middle of the anterior side. Seen f r o m b e 1 o w it is lentil-shaped, about the same as
in pl. 8. fig. 20, G. W. MÜLLER, 1804. The s u r f a c e of the shell lias small foveolae situated
close together and lias a scarcely perceptible réticulation.
First a n t e n n a (see the appended fig. 2) : — This has four joints; the first and the
second joints are rather closely joined to eacli other, the former, as G. W. MÜLLER pointed out, 1804,
p. 233, being situated laterally of the latter. The proportion between the joints is about as foliows :
The first joint has no bristles. At the middle of the dorsal side of the second joint there is a
short-haired or almiost bare bristle, which is about half as long as the dorsal side of this joint.
The third joint has dorsally a plumous bristle, which is somewhat longer than this joint. The
end joint has live narrow natatory bristles, the four longest of which are about twice as long as
this limb, the remaining one about a third shorter; theyare ail furnished proximally with rather
short natatory hairs and are bare distally. The wall of the second joint grows very much thicker
dorsally, distally of the bristle. Pilosity: The first joint has some oblique longitudinal rows
of short, fine hairs on the inside. Second joint: Proximally of the bristle this joint is furnished
dorsally with a dense mass of rather long hairs and has moderately long hairs scattered medially.
Distally of the bristle this joint is furnished with short, stift’ hairs, placed close together dorsally;
similar hairs are also found along the distal edge of this joint. There is a collection of rather
long hairs ventrally on this joint just in front of the point where the bristle is fixed. The third
joint has short, fine hairs ventrally.
Second antenna: — Protopodite: This is about a quarter of the length
of the shell and is of the type reproduced by G. W. Müller, 1894, pl. 7, fig. 5; it has no
bristles or appendages. Exopodite (see the appended fig. 3): This is somewhat more than
half the length of the protopodite and is of about the sanie type as in the figure of G. W. MÜLLER’s
just mentioned. It has nine joints; the first joint is not quite so long as the total length of the
eight following j oints. Unlike in the C y p r i d i n i d s and Halo c y p r i d s, there is a long natatory
bristle ventero-medially on each of the first eight joints (the brandi in thought of as pointing
forward as in fig, 6, pl. 7, G. W. MÜLLER, 1894); these bristles are furnished with more or less
long natatory hairs along the greater part of their length (they have no spines, unlike in
a number of Cypridini d s) ; the distal part of these bristles is not widened or specifically
differentiated in any other way. The bristles on the first to the eighth joints are subequal,
about as long as or even somewhat more than twice the length of the protopodite. The end
joint has three bristles. The ventral one of these three is about two and n half times the length
of the exopodite; one of the two others is about as long as this branch, the other is about as long
as the total length of the 3—5 distal joints. The shortest of these three bristles is almost bare,
the two others are furnished with rather short natatory hairs. At the middle of the inside there
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