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The bristles of the third and fourth joints and the middle one of the three bristles on the end
joint are, in addition, furnished, the two former ventrally, the latter dorsally, with a series
of very coarse, strong, smooth spines, somewhat blunted and rounded distally (the species has
obtained its name from this character); the number of spines on each bristle seems to vary,
from twelve to eighteen have been observed; they are so placed that when the nata tory bristles
are situated closely along each other a single row of spines is formed, in otlier words, the spines
on the bristle of the fourth joint are situated so as to form a direct continuation of those of the
preceding bristle and the spines on the bristle of the end joint are a continuation of those of
the bristle on the fourth joint; the row of spines on the bristle of the third joint begins a rather
long distance from the base of the bristle, the unarmed proximal part of this bristle corresponding
in length to about the total length of the five or six distal joints. (This unarmed part is protected
by the strong bristle of the second joint). The end joint has only three bristles, of wliich the
two ventral ones are developed in the same proportions as the natatory bristles of the
preceding joints; the dorsal one, which also has long, well-developed natatory hairs, situated
close together, is about as long as the total length of the eight distal joints. The four distal
joints have powerful basal spines; the basal spines on the third to the fifth joints are, on the
other hånd, very small, especially those on the third and fourth joints, which can only be observed
with difficulty. Endopodite (fig. 10): This is short and verruciform, with only an indication of
having two joints. Proximally it has three bristles of somewhat different lengths, the longest
being comparativcly long, more than double the length of the shortest and about as long as the
total length of the four distal exopodite joints; they all have short hairs or are almost naked.
M a n cl i b 1 e (fig. 11): — P r o t o p o d i t e: The endite on the coxale has a rather
moderate number of spines. It is — as has been pointed out above — weakly bifurcatecl
distally, the two distal points are considerably stronger than the spines and are almost quite
bare; between these two points there is a verruciform process. The basale has seven brist les
ventrally: three a-bristles, one b-bristle, two c-bristles and one d-bristle. Of these the a-,
b-and c-bristles are short, the b-bristle being even rather difficult to distinguish, the d-bristle
is about as long as the second endopodite joint. At the base of this last bristle there is no short
bristle, contrary to what is the case in all the other species of this sub-family that are dealt
with in this work. Of the three bristles on the dorsal side the proximal one is fixed at or just
behind the middle of the joint and is quite short, being only about a fifth to a quarter of the
length of the dorsal side of this joint; the two distal bristles are similarly rather short, one being
about as long as the dorsal side of the first endopodite joint, the other twice as long; all these
three bristles have short hairs. The exopodite is a good deal shorter than the dorsal side
of the first endopodite joint; both its two bristles have short hairs or are almost bare; the longest,
the proximal one, is about as long as the longest distal bristle situated dorsally on the second
protopodite joint, the distal one is short, about as long as the exopodite. Endopodite:
Of the four ventral bristles on the irrst joint the longest one, which is not quite as long as the
posterior side of the second endopodite joint, Iras numerous long secondary bristles arrangeai
in irregulär wreaths, and lias short hairs distally; the other three have short hairs. Second
joint: This has rather few bristles on the anterior side; these are conc sntrated on the proximal
Zoolog, bidrag, Uppsala. Suppl.-13d. 1.
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