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.
Asterope curta n. sp.
Description: — F e in a 1 e: —
Shell: — Length, 1,70—1,80 mm.; lengtli : height about 1,32 : 1; length : breadth
about 1,8 : 1. Botli when 1 o o k e d a t from t li e side and also from b e n e a t li
the shell is of about the same type as that of A. Mülleri, but is somewhat high«’ and wider in
comparison; cf. the figures 1 and 2. Sometimes, however, when seen from the side, it is somewhat
more sharply cut off at the back. Seen from inside: Medial bristles: On the rostrum, in the
incisur and at the part just behind the latter there is a moderate number of stift’ bristles; most of
these are subequal and moderately long, but a few more or less short bristles may be found,
especially among those situated farthest in. All these bristles are scattered; sometimes, however,
the bristles that are situated on the rostrum just within the anterior margin of the shell may
be said to be arranged in a sparse and not quite distinet row running about parallel to the anterior
margin of the shell. Along the ventral margin of the shell there are a moderate number of rather
short bristles, in most cases arranged in a simple row running about parallel to and somewhat
inside the margin of the shell. Along almost the whole of the spine-bearing list and about
parallel to and half way between it and the posterior margin of the shell there runs a very close
and distinct row of stift, moderately long, bristles (fig. 5). The spine-bearing list has about
24—25 hyaline spines and a thin row of short, subequal bristles, usually one or two, sometimes
three between each hyaline spine. There are no wide pores on the part between the
spine-bearing list and the posterior margin of the shell. An edge similar to that on the right shell of
A. spinifera is developed in this species as well, but is somewhat weaker.
First antenna (fig. 6): — This is very like that of A. Mullen. A few differences
may, however, be noted. The third and fourth joints together form an almost quadra tic joint
and are together about as long as the total length of the fifth and sixth joints. The distal
boundary of the fourth joint is rather weakly or moderately strongly concave. The third joint
has only five bristles anteriorly; judging from the equipment and situation of the bristles it is
bristle no. 2 of those species that have six bristles that is lacking. On bristle no. 1 there are
numerous long, stift secondary bristles ventrally, on bristles nos. 2, 3 and 5 there are a few similar
secondary bristles, bristle no. 4 has short hairs. The longer of the two posterior distal bristles
on the fourth joint is, as a rule, somewhat shorter than the total length of the three distal joints;
in one case it was the same length as this.
Second antenna: — Distally on the inside close to the exopodite the p r o
topo di te has a very short bristle. Exopodite: The end joint has only three bristles.
There is no basal spine except on the ninth joint, on which it is certainly large, but presumably
very weak, as it is divided into fine hairs distally. The endopodite is distinetly
three-jointed; its end bristle is slightly longer than the stem. In two cases out of five a short bristle
was observed on the second joint, both on the right and on the left antenna (abnormal?; a bristle
of this sort was observed by me as a rather infrequent abnormality not only in this genus but
in species of the family Cypridinidae); cf. the accompanying figure 8,
<< prev. page << föreg. sida << >> nästa sida >> next page >>
