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F i
a certain
the, joints
r st antenna: — The fiftk and sixth joints, although still free, seem to show
tendencv to become joined to each other. The approximate proportions between
are as follows:
28
II
111
IV
Y ’ : VT
VII f; VIII 0,3.
The most striking faet is perhaps the great réduction of the third joint; this joint has, however,
no marked tendency to become joined to the neighbouring joints. The posterior bristle of the
third joint and the postero-distal bristle of the fourth joint are about subequal and almost
completely reduced; their length corresponds to about the breadth of the sensory bristle of
the fifth joint proximally. The anterior bristle of the third joint, the antero-distal bristle of
the fourth joint, the medial-distal bristle of the sixth joint and the a-bristle of the seventh joint
are ail subequal, of about the total length of the fifth and sixth joints and have short, fine hairs.
The sensory bristle of the fifth joint is somewhat longer than the anterior side of the seven
distal joints (the proportion is about 57 : 50) and has eleven sensory filaments. The seven
proximal ones of these are fixed between about a third and a quarter of the distance along the
bristle, are rather thick and long, being about a third of the whole length of the bristle, and are
bare. The three following ones are considerably shorter, about a fifth to a sixth of the total
length of the bristle, and narrow; they are furnished with a few, about one to three, weak
secondary spines, and are separated from the others by a decided gap. The most distal of these
filaments is quite short and bare, and is fixed near the point of the bristle. Of the bristles on
the two distal joints the b-bristle is not quite as long as the five distal joints, and has four short
filaments which are almost quite bare; the f-bristle is about as long as the anterior side of the
seven distal joints and is characterized by eight or nine filaments, the c- and g-bristles are
subequal and about a third longer than the last-mentioned one and have ten filaments. Some
of the proximal filaments on the three last-mentioned bristles, the c-, f- and g-bristles, have
a few (about one to four) short, weak secondary spines. The two simple sensory bristles d and
e are subequal and almost as long as the anterior side of the second joint. Pilosity: The second
joint is rather well furnished with hairs, especially postero-distally; otherwise this limb is smooth.
Second antenna: — Protopodite: Length, about 0,6 mm. The
medial-distal bristle is relatively long, of about the same length as the longest of the bristles of the
first endopodite joint; it has short, fine hairs (fig. 10). The exopodite (fig. 9) has about
the following proportions between the joints:
1:11:111: IV : V : VI : VII : VIII : IX = 30 : 6 : 3 : 3 : 3
In other words the first joint is somewhat longer than the total length of ail the following joints,
the second joint is about as long as the total length of the two following joints, the other joints
are subequal. The bristle of the second joint is about as long as or somewhat longer than the
total length of the eight distal joints; it is furnished ventrally with a few — in the two cases
investigated there were eight—smooth, powerful secondary spines, sparselv placed, and dorsally
it has a corresponding number of short, rather fine, bristles, situated opposite the ventral spines.
The proportion between the length of the longest natatory bristles and the whole exopodite
is about five to three. The natatory bristles have broad natatory hairs placed close together.
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