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.
species of this genus, as the latter stop a good distance distally of the nodous teeth.) The
secondary claws never seem to be annulated.
The lateral eyes are well developed. The median e y e is bare.
Male: —
Shell: — Length. 1,7—1,75 mm.; length : height about 2,27 : 1. Seen from the
side (fig. 3) it has the same elongated type as the female, but is somewhat less regulär. Its
greatest height is at about a third of the way along the shell and the anterior part of the shell
dominâtes to some extent over the posterior part. The dorsal and ventral margins converge
gently backwards from the point where the shell is highest. The dorsal margin is somewhat
irregulär, it is somewhat flattened anteriorly and is characterized by a gentie and broad arcuation
somewhat in front of the middle of the shell and a similar arcuation just in front of the place
where it passes into the posterior margin. The ventral margin is slightly and almost evenly
arched, somewhat flattened anteriorly. The posterior margin is evenly and rather strongly
curved, passing into the ventral margin with a broadly and evenly rounded line; it is bounded
from the dorsal margin by a broadly rounded corner, which is only slightly distinct. The
anterior margin is boldly rounded and passes evenly into the dorsal and ventral margins.
The part situated ventrally of the incisur is about as large as the rostrum. Seen from
b e 1 o w (fig. 4) it is narrowly oviform with its greatest breadth at about a third of
the distance along and the anterior part somewhat larger than the posterior part. The
wreath of hairs round the posterior part of the shell is rather dense. Seen from
inside: The medial bristles are perhaps somewhat fewer than in the female. Otherwise
the shells are alike in both sexes.
First antenna (fig. 11): — This has seven joints. The proportion between the
joints are about the same as in A. norvegica; cf. the description of the genus. Of the anterior
bristles on the third joint nos. 3 and 6 especially are very much shortened; the ecpiipment of
these bristles is about the same as in the female, only somewhat weaker. The longer of the two
posterior distal bristles on the fourth joint is considerably shorter than the total length of the
three distal joints; even calculated absolutely it is in most cases somewhat shorter than that
of the female. The sensory bristle of the fifth joint is very much more powerfully developed
than in the female; its stem is thick and about as long as or somewhat longer than the total
length of the three distal joints; it has very numerous sensorial filaments. The a-claw is smooth.
The b-bristle is about as long as the anterior side of the second joint or is somewhat shorter;
it has six sensorial filaments. The c- and f-bristles are subequal and are about one and a half
times the length of the shell; a length of 2,5—2,7 mm. was observed; the c-bristle has 25—29,
the f-bristle 23—26 sensorial filaments. The g-bristle is about as long as the anterior side of
the second and third joints; it has nine sensorial filaments.
Second antenna: — The exopodite is very much lengthened
relat-ively; its two proximal joints especially are considerably longer than the corresponding
joints in the female. The relation between the lengths of the joints is shown by the
following figures:
o (shell 1,7 mm. long) = I : II : (III —IX) = 34 : 17 : 22.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
