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H a n s e n“. The relative length of these bristles varies somewhat, however. The b-bristle
is short-haired; both the c-bristles usually have short hairs, on the right mandible of the specimen
from M/S „Ar ma uer Hansen“ the longest of them was, however, fitted with long
secondary bristles in the middle; the shorter d-bristle also usually has long secondary bristles
in the middle, often, however rather few in number, in the second specimen from S/S „A n
t-arcti c“ it was even short-haired. The three dorsal bristles are subequal, about as long as
or somewhat shorter than the dorsal side of this joint; they have short hairs or are almost bare,
the proximal one is fixed somewhat distally of half the length of the joint. — The e x o p
o-d i t e is somewhat longer than the dorsal side of the first endopodite joint. < )f its two bristles
the proximal one is about as long as the dorsal bristles of the second pro topodite joint, the
distal one attains to only about half the length of the exopodite; both have short hairs or are
almost naked. — E n d o p o d i t e: The four ventral bristles of the first joint have a comparative
length that is typical for this sub-family; the longest one does not quite attain to the length
of the posterior side of the second endopodite joint, furnished with irregulär wreaths of long
secondary bristles, with short hairs distally, the other three are short-haired. The second
joint: This has a thiek mass of bristlcs of various kinds along almost the whole anterior side.
The number and situation of the bristles seem to vary rather considerably; firstly there are
20—30 more or less long bristles with sparse short hairs, about the same as in Th. Scott’s figure
mentioned above, secondly a very7 large number of cleaning bristles, either arrangée! in more
or less distinct rows running slantingly upwards and forwards, or at least partly almost quite
without regulär arrangement; the number of these rows of bristles is difficult to decide with
certainty, as they are situated very close together, yet it seems to vary between fifteen and
a little over twenty. The posterior bristles in these rows are rather short, the distal two thirds
of them are finely pectinated, about the same type as shown in fig. 21 adjoining; the pectination
on these bristles is so fine that it can only be observed with difficult}7 with Reichert’s ok. 4,
LE1TZ’ immers. In front of these bristles, thus nearer the anterior edge of the joint, the
cleaning bristles are somewhat longer and of somewhat different types; a number of them have
extremely fine pectination on their distal half or third; a number are very powerfully pectinated
on their distal third or quarter; the stalle of these bristles is often furnished with a more or
less large number of rather powerful spines proximali}’ of the pectinated part (the types shown in
figs. 22 and 23); spines may also occur on the stalle of the short cleaning bristles. Transitional
forms between these different cleaning bristles are, however, to be observed. On the distal
half of the posterior side of this joint there are three to five rather short, almost subequal,
moderately strong, naked bristles (fig. 9), situated at about an equal distance from each other.
Distally of these there are two spine-shaped bristles, situated next to each other, most frequently
somewhat shorter than the former but very mueh stronger, in most cases about as long and as
strong as each other; sometimes the medial one is shorter, though rather slightly so. Of
the seven bristles of the little end joint (fig. 9) the medial of the two middle ones is comparatively
long and powerful, varying somewhat in its comparative length, most frequently about as long
as half the posterior side of the second endopodite joint or somewhat shorter; the other of
the two middle bristles is somewhat weaker and only about half the length of the former
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