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.
eight-jointed. The proportion between the joints shows so me, though rather insignificant
variation; is about as follows:
n
IV
V
VI
VII
VIII 0,5;
in other words about the same as in pi. IL, fig. 5, Tu. Scott. 1912 b. The end joint is often
somewhat withdrawn into the seventh joint and rather difficult to verify with certainty; it
is best seen from the lateral side; it is moved by special muscles. The anterior bristle of the
third joint is situated somewhat proximal!}’ of the middle of the joint. This bristle, the
posterior bristle of this joint, the two bristles of the fourth joint, the bristle of the sixth joint,
and the a-bristle of the seventh joint are most frequently subequal or rather slightly different
from each other in length, about as long as the third joint; the length varies, however, to some
extent; all these bristles are bare or hâve short hairs. The sensorv bristle of the fifth joint is
rather long, attaining to about the length of the posterior side of the second to the eighth or
the third to the eighth joint. The b-bristle about as long as the anterior side of the third and fourth
joints. The c-bristle attains about the saine length as the whole antenna. The d- and e-bristles
are in most cases somewhat different in length from each other and somewhat shorter or longer
than the b-bristle. The g-bristle attains about half the length of the shell, the f-bristle is
somewhat shorter. The number of filaments on the sensory bristle of the fifth joint and on
the distal bristles varies somewhat, as is shown in the table below. The lengths in this table are
the averages of the right and left first antenna; in most cases, however, the right and left
bristles were quite the same length; the difference was never great.
SensoriaEbristle of the 51h. joint. b-bristle. c-bristle. f-bri Stic. g-bristle.
X umber of Length. X umber of Length. X umber of Length. X um her of Length. Number of Length.
filaments mm. filaments mm- filaments mm. filaments mm. filaments i mm.
,,Michael Sars“ 1 Right. 14 3 2 4 1.7 20 5,4 22 5,8 23 7,0
Type-specimen { Eeft. 1 1 5 21 21 2 2
..Michael Sars“ 1 Right. l’i 3,0 5 1.7 2 » •5/. 25 6.0 27 H 3
Ist. specimen j Eeft. J 5 2 i 23 26
..Michael Sars“ I Right. i’i 3 2 5 1,6 23 5,6 23 5.7 25 7,0
2nd. specimen 1 Eeft. i \ 4 24 2 t 23
..Michael Sars“ 1 Rieht. E! 3,3 5 1.7 23 5,8 26 6,2 97 / ..9
Uni. specimen 1 Eeft. ! 5 22 25 27
..Armauer Hansen“ 1 Right. 1’. 3,0 5 1,5 0‘> 5,2 2 4 5.7 9 6.0
Ist. specimen 1 Eeft. Ei 5 09 25 05
., \ntarctic“ 1 Right. 1’. 3.9 5 2 2 25 6.7 33 7. \ 33 8,7
Ist. specimen 1 Eeft. 15 5 25 33 39
..An tard ic" 1 Right. 15 4,0 5 2 3 *28 7.1 33 7,3 36 8.9
2nd. specimen 1 Lefl. 14 5 27 31
Hie filaments on the sensorial bristle of the fifth joint are rather long, their length varving
to some extent, the longest being about a quarter of the whole length of the bristle; the distal
one is rather short; they are all narrow, cylindrical, naked: between the short distal filament
and (lie next distal one there is a decided gap, which does not exist between the others. The
<< prev. page << föreg. sida << >> nästa sida >> next page >>
