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there is variation within the species; like the secondary teetli on the succeeding claws, they are
directed obliquely ventrally-distally. On the following three to five claws the medial row of
teeth is absent; the lateral row on these is about the same as the corresponding row on the first
claw, but the teeth are somewhat weaker the more posteriorly they are situated. These four
to six claws are bare or almost bare dorsally; their distal parts are also quite bare. Of the
succeeding claws the anterior ones, like the preceding ones, are furnished with a lateral row
of rather coarse teeth; distally they are moderately strongly pectinated dorsally and ventrally
right to their points; the coarse secondary teeth become more and more rare on these claws
the more posteriorly the claws are situated; on the most posterior they are often quite missing;
distally the posterior claws are finely pectinated dorsally and ventrally. On the anterior claws
there is often a transverse row of long, sti ff, smooth bristles proximallv-medially. Similar bristles
may also be found on the lamellae medially close to the claws. The pilosity of the lamellae varies.
Male: — In this sex the furca is of about the same size as in the female, but it is
constructed more weakly. The number of claws is the same or only slightly less than in the
female; their equipment is somewhat weaker.
U p p e r 1 i p: — This shows no sexual dimorphism. — It seems to be subject to only
very slight variation within this genus. Because of this I did not think it necessarv to reproduce
it, but merely refer the reader to G. \V. MüI.LER’s reproduction, 1908, pl. VI. fig. 15. It is rather
small and somewhat helmet-shaped, with an unpaired conical median process, pointing somewhat
upward and forward; on the point of this process there is a small glandular held. Between
the lip and the frontal organ there are some irregulär protubérances.
The median eye is well developed in both sexes (it is less pigmented in the female
than in the male). The rod-s haped organ is also similarly developed in the two
sexes; it is long and narrow and grows slightly narro wer distally.
Lateral eyes: — These are reduced in the female, being only represented by a little
claviform unpigmented process on each side, in the distal part of which there are remains of
the crystalline cônes of a few ommatids. (Sometimes quite disappeared?). In the males, on the
other hånd, the lateral eyes are very well developed and situated rather far towards the back.
There are never any g i 11 s.
Spécial terminology: — First antenna: — The far-reaching agreement that
I have stated between the position of the bristles on the original seventh and eighth
joints in this genus and the position of the bristles on the corresponding joints in the
sub-family Cypridininae can scarcely be explained in any other way except by an assumption that
these bristles are really homologous. Because of this I considered that I was justified in using
the same alphabetical notation for these bristles in this genus as was used above for the
sub-family just mentioned. Of the bristles on the original seventh joint the anterior one is
accord-ingly called the a-bristle, the medial one the b-bristle and the two posterior bristles the c, and c.,
bristles. Of the bristles on the original eighth joint the two that are situated close to each
other laterally are called the d- and e-bristles (the anterior one the d-bristle and the posterior
one the e-bristle), the anterior-medial one the f-bristle and the postero-medial one the g-bristle.
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