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remaining one of tliese three bristles is somewhat shorter than the former ones and has in most
cases short, fine hairs; it is rarely provided at the middle with a number of long secondary bristles.
Antero-distally this joint is in exceptional cases furnished with powerful chitinous spines
(cf. A. spinifera, fig. 10). The second joint has postero-distally three rather long bristles with
short, fine hairs; two of these bristles are situated close to each other somewhat distally of the
third. The proportions between these bristles were subject to only slight variation in the species
investigated by me; one of the two distal ones and the proximal one are either subéqual or else
the latter is somewhat longer; the remaining one of the two distal bristles is considerably shorter
than the two former ones and is also often characterized by being somewhat curved dorsa lly.
Along the anterior edge of this joint there are a rather large number of bristles. Among these
may always be noticed four powerful and rather long ones, in most cases subéqual, situated
at about equal distances from each other along the whole of the joint and generally sparsely
provided with short and fine hairs, sometimes apparently even quite bare. These four bristles
are called the ,,main bristles“ in this treatise and are denoted proximo-clistally with the letters
a—d. Proximally of and close to the proximal one of these bristles, the „main bristle a“, there
are from one to a small number, different in different species, of rather weak bristles with
short, fine hairs or bare, often rather considerably shorter than the main bristles. Between the
main bristles b and c there is in a number of species a rather weak bristle with short, fine hairs.
This bristle is of rather considérable length, in most cases, however, not quite so long as
the main bristles; in a number of species it is quite absent. Between the main bristles c and
d there is in all the species investigated by me a similar rather weak bristle with short, fine hairs;
this bristle is often about as long as the main bristles. An additional bristle of this sort, but
somewhat shorter, was always observed distally of and just near the main bristle d. Finally
there is anteriorlv on the medial side of this joint a greater or smaller number of moderately
long or rather short cleaning bristles, characterized by being furnished distally with close, rather
short, in most cases rather powerful secondary bristles, arranged in the shape of a feather. These
bristles are partly arranged in a few more or less distinct rows running slantingly upwards and
forwards. On the species investigated by me I have always seen a row of this sort, running within
the main bristle c. In these rows of bristles the anterior bristles are somewhat, sometimes even
considerably, longer and more powerful than those situated farther back. The cleaning bristles
vary somewhat within the species both with regard to number and position; they may, however,
be used to some extent as a character of the species. The end joint has six bristles, of about the same
type and position in all the species investigated by me. The anterior one is developed as a
powerful claw. Three have about the same type and length as the main bristles of the second
endo-podite joint. Of the two remaining ones, both rather weak, with short hairs, one is situated
close to the claw, the other between the two posterior of the three long and powerful bristles;
the former of these two bristles is always somewhat longer, the latter always somewhat shorter
than the claw. Pilosity: The second endopodite joint has numerous groups of short, line, stiff
liairs on the inner side.
Male: ■— As has been pointed out above, the male mandible agrees in all essentials
with that of the female. it seems to be too early totry to generalize the dimorphism, because of the
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