Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
rostral incisur there is a rather sparse row of moderately long bifurcated bristles (fig. 2); this
row becomes more and more sparse posteriorly, and at the same time the bristles become shorter
and simple, and already at half the length of the shell it practically ceases altogether; single short
simple bristles may, however, be observed on the list along the posterior part of the ventral
edge of the shell. Within the posterior margin of the shell the list is rather broad and has
from about 20 to 25 short bristles and outside these a varying number of peculiar formations, the
nature ofwhich I have not succeeded in establishing with füll certainty; probably they are a sort
of pores, at any rate they somewhat resemble these formations; seen from the side, they have
about the type reproduced in the accompanying figure 3, some of them at least seem to have,
if I am not mistaken, an extremely short and fine hair (the vérification of this is uncertain
even with a magnifying power as large as Reichert’s ocular 4, Leitz’ immers. y12). On
the part between the list and the edge of the shell, both along the ventral edge and posteriorly,
there are practically no medial bristles at all. The selvage is rather broad along both the anterior
and posterior edges of the rostral incisur; on the other hånd it is rather narrow along the anterior
edge of the rostrum and along the ventral margin of the shell; it extends, however, rather
consi-derably outside the edge of the shell even in these parts. It has close, even and fine, in most cases
almost invisible cross-striation, and is exceedingly finely serrated at the edge, almost quite even.
First antenna: — The posterior distal bristle of the third joint is generally
somewhat longer than the bristle of the anterior side of this joint and also somewhat longer than
half the length of the fourth joint; the anterior of these two bristles is fixed at about a third of
the length of the joint. The two bristles of the fourth joint are generally subequal, not quite
as long as the fifth joint. All the bristles mentioned seem, however, to show a not inconsiderable
variation with regard to their length. The sensory bristle of the fifth joint is about as long as
the anterior sides of the second to the fourth joints taken together; of its thirteen sensory
filaments the ten proximal ones are about a third of the length of the whole bristle and are rather
considerably thicker than the distal ones, from which they are, in addition, separated by a
distinct gap; the two following ones are only a quarter to a fifth of the whole length of the bristle;
the remaining, distal one is situated near the point of the bristle and is very short and narrow;
they are all of about the same thickness throughout whole their length and quite naked. The
a-bristle of the seventh joint is about as long as the fifth joint, the bristle of the sixth joint
is somewhat shorter. The bristles of the third, fourth and sixth joints and the a-bristle of the
seventh joint are all furnished with short, fine hairs. Of the bristles of the seventh and eighth
joints the b-bristle is about the same length as the five distal joints and has five sensory filaments.
The c- and f-bristles are subequal and about double the length of the six distal joints; each
of these two bristles has ten sensory filaments. The g-bristle is somewhat longer and is
character-ized by eleven sensory filaments. The proximal filaments on these bristles have from one to
six rather short and weak secondary spines, the distal ones are smooth. The sensory tube-like
bristles d and e are subequal, about the same length as the six distal joints taken together.
Pilosity: The second joint is very sparsely furnished with hairs.
K e c o n d a n t e n n a: — Protopodite: Length about 0,7—0,8 mm. in specimens
about 2,5 mm. long. The medial-distal bristle (fig. 7) is short, about as long as or even somewhat
<< prev. page << föreg. sida << >> nästa sida >> next page >>
