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.
Bemärks: — The re-description of A. abyssicola given above is based on an investigation
of a single specimen, a female with large eggs in the brood chamber, which was kindly placed
at my disposai by Professor G. ( ). Sars and which was denoted by this writer as the type specimen
of this species. It is certain, however, that this statement of G. 0. Sars’s was not quite correct.
This is shown by the faet that the specimen sent to me was not dissected, while the original
description was obviously made from a dissected specimen. The specimen investigated by me
is probably, however, one of the two specimens that G. 0. Sars mentions 1870, p. 171: „Kun
2 Exemplarer af denne lille. Cypridi nide toges ved Guldbrandsøerne paa 120 Favnes
Dyb.“* This is supported by the habitat, among other things: „Lofoten 120 F.“ The
préparations of the dissected type specimen have, according to what Prof. Sars replied to an
enquiry of mine, been certainly irrecoverably lost. It seems, however, to be beyond all doubt
true that the specimen re-examined by me belongs to this species.
As the specimen in question was somewhat defective I was unfortunately not able to
give such a complete description of the species as is desirable, but I hope that in spite of the
incompleteness the description will permit of a certain identification of the species. The
characters that could onlv be described incompletely or to which a certain amount of uncertainty
is attached are as follows : The medial bristles of the s h e 11 ; the number of bristles on the
anterior side of the original third joint and the equipment of the bristles of the end joint of the
first antenna; the number of bristles on the end joint of the exopodite of the second
antenna; the bristles on the s i x t h 1 i m b and the number of f u r c a 1 claws. With
regard to the number of bristles on the end joint of the exopodite of the second antenna
it may be pointed out that on this antenna of one side — on the other side the two distal joints
on the natatory branch were missing — three bristles were observed on this joint, one long
one and two short ones, the two latter of about the same relative length as the two short ones
in figure 5 of A. Gnmaldi. I did not succeed in deciding with certainty whether an additional
(long) bristle had existed originally, in other words if this joint is characterized by four bristles,
the usual number in species of this genus. It seems, however, very probable to me that this
was the case. The s i x t h 1 i m b is certainly of the same type as is usual for this genus,
with a large number of ventral bristles. Both the f u r c a 1 lamellae were armed with eight
claws. But this organ seemed to be somewhat damaged behind the posterior claws, so that
1 am not quite certain whether one or more additional claws may not have existed originally.
As will be seen from a comparison therc is a close resemblance between G. O. Sars’s
original description and the re-description of this species given by me above. There are, however,
a number of differences. Thus G. 0. Sars states that the shell is onlv 1,32 mm. long, while,
as is seen above, I found it to be 1,63 mm. At present of course I cannot express any certain
opinion as to whether this difference in length is due to the faet that the specimen measured
by G. 0. SARS was a larva or if the species is subject to such great variations in length at the
same locality. But the faet that, if we assume the specimen measured by G. 0. Sars to be
a larva in the first stage, we obtain a coefficient of growth of 1,23 (1,63 : 1,32 1.23), i. e. about
the same coefficient as I found for other closely-related forms (A. Grirmldi, Cypridina (Doloria)
Maler tal.
/ncompleteness nj
the description.
Differences heiteren
ilte original
description and mine.
Only two specimens of this small C\ pridi nid were takon al the Guldbrand islande at a dopth of l’JO ratlimns.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
