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mammillaris that is drawn in these figures is only seldom developed. Of the two bristles on this
joint, both of which are attached distally on the antero-distal process of the joint, the distal
one, the b-bristle, is in most cases of about the same length as the proximal breadth of this
process, the proximal one somewhat shorter; cf. figs. 13 and 14 of C. symmetrica; onlv in
exceptional cases — which are specially mentioned in the descriptions of species — are there
deviations from this rule. The second joint is rather short, but rather powerful; it is most
often of about the same shape as in my figs. 13 and 14 of C. symmetrica (only exceptions are
noted in the descriptions of species). It is most frequently armed with five bristles. Of these the
c- and d-bristles are rather short and weak, pointed and of the ordinary type, the f- and g-bristles,
on the other hånd, are comparatively long, the g-bristle is in most cases longer than the f-bristle;
they are rather powerful proximally, hyaline distally and obviously fonction as sensory organs.
Besides these four bristles there is, as has bee.n mentioned, an additional bristle, the e-bristle;
this, which is situated somewhat distally of the c- and d-bristles at the base of the f-bristle,
is always more or less short, pointed and of the ordinary type. The end joint varies verv much
in type. The three bristles on this joint, the h-, i- and j-bristles, are subequal, always shorter
than the f- and g-bristles and developed as hyaline, thin-walled (only exceptionally, as in the
case of C. Giesbrechti, partly thick-walled) sensorial filaments, attached a short distance distallv
of the proximal boundary of this joint. The first endopodite joint always seems in this genus
to be furnished with exceedingly close short, fine spinés on a rather large part of its surface.
F e m a 1 e: — The protopodite is like that of the male excep c for the faet that
it has no disto-medial verruciform process. The endopodite has two or three joints.
The first joint is about the same as that of the male. The original second joint is weaker than
that of the male and more or less cylrndrical. The third joint is extremelv small in those cases
■when it is developed at all.* The bristles of the first joint are about the sanie as in the male.
Of the bristles on the original second joint only two are developed in most cases, narnely the
f- and g-bristles; the c-, d- and e-bristles are almost always quite absent (onlv when one or
more of these bristles are developed is it stated in the following descriptions of species); the
f- and g-bristles are developed in about the same way as in the male. On the little end joint
the h-, i- and j- bristles are always developed and in most cases they are of about the
same type as in the male. Between the h- and i- bristles there is also in a nuruber of
species a short, peg-like process or a short bristle. (For the morphological value of this bristle
see p. 584 above, the remark on the genus Halocypris.) The first endopodite joint is, as in the
case of the male, furnished with short and fine spines.
M a n d i b 1 e: — This limb seems to be subject to rather slight variation in this genus.
In most of the species investigated by me I found — apart, of course, from small individual
variations — quite the same type as far as most characters were concerned. In some species, however,
more or less dcviating types were observed; in this case it was not always the same character
that varied, but sometimes one, sometimes another. Under these circumstances it seemed to
* All the previous writers state that this brauch is always two-joinled. O. \V. Müller, however, has observed
that three joints are sometimes developed; cf. G. \V. Müller. 1906 a. p. 98. He has, however, obviously forgoüen this
faet in working out the genus diagnosis.
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