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haired bristles ventrally. Most of these are usually of the tube-bristle type and are about as
long as the proximal height of this joint; three (two) of these are situated about half-way along
the joint, the two others are placed distally. Laterally at about the middle of this joint there
are two bristles, of about the same length as the former ones, but with long, soft hairs, and short
hairs distally; they are pointed. The bristle situated dorso-distally on this joint is very long,
being about as long as the total length of the first and second exopodite joints; it has short,
fine hairs and is pointed. The three bristles on the second joint have short, fine hairs. The two
ventral ones are subequal, somewhat more than half the length of this joint. The dorsal one is
about as long as this joint. The dorsal one is usually pointed, the ventral ones usually of the
tube-bristle type. End joint: The middle one of the three bristles is rather powerful and about
as long as the total length of the two distal exopodite joints; it is finely pectinated; its point
is in most cases of about the type reproduced in fig. 28 of Conchoecia symmetrica. The two others
are somewhat shorter and weaker and have short, fine hairs; they are of the tube-bristle type
or are pointed. Pilosity: Proximo-anteriorly on the protopodite there are groups of short, fine
hairs; the first exopodite joint has groups of soft hairs, principally proximo-ventrally and
dor-sally, but sometimes medio-distally as well.
Sixth li mb (fig. 28): — This is large and powerful and has a very powerfully developed
musculature; it is used as an auxiliary organ in swimming: The protopodite is unjointed.
Endopodite: This is quite joined to the protopodite; its special musculature has quite
disappeared. It has two short-haired, pointed bristles, one of which is about as long as the
width of the protopodite (calculating from front to back), the other is often only about half
as long; both are attached antero-ventrally on this part. Exopodite: First joint: Scattered
along the ventral side, somewhat medially, there are five bristles of the same type as the two
just mentioned, about as long as or rather slightly shorter or longer than the proximal height
of this joint. Laterally at about the middle of this joint there is a single bristle of the same
type and about the same length as the ventral bristles. The dorso-distal bristle on this joint
is bare or almost bare, pointed, and about as long as or somewhat shorter than half the length
of the second exopodite joint. Second joint: Ventrally at or somewhat in front of the middle
there are (contrary to ail the other species of this sub-family known to me) two subequal, bare or
almost bare, pointed bristles, one situated somewhat distally of the other, in most cases not
quite half the length of this joint. Third joint: The two bristles are bare or almost bare, pointed
and subequal, almost as long as this joint; they are situated somewhat in front of the middle
of the joint. The three bristles of the fourth joint are subequal and all of the same type ; they
are about as long as or even somewhat longer than the exopodite; along the distal two-thirds
of their length they are furnished with rather long natatory hairs, and are evenlv and rather
strongly curved ventrally (when in a state of rest these three bristles point dorso-posteriorly;
their points are often visible at the postero-dorsal corner of the shell; it ought perhaps to be
pointed out that these three bristles do not change into sensory organs distally). Pilosity:
Anteriorly on the protopodite and the endopodite there are a rather sparse number of rather
short, soft hairs. On the first exopodite joint there is a group of similar hairs proximo-laterally,
somewhat ventrally.
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