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.
Habitat. Eeast-coast of Greenland, depth 350 fathoms (500
S.); Greenland, N.W. from Cape York, depth 5—10 fathoms
(540 S.); East-coast of Greenland, depth 130 fathoms (580 S.);
Nörthcape, Lat, 71° 13’ N., Long. 26° 2’ E., depth 180 fathoms
(30 N. S.).
Whether Hymeraphia vermiculata Bow. is a young form of
au Axinella O. S. or not, I am not able to decide, since I have
had no specimen of Hymeraphia vermiculata Bow. for comparison.
As for Hymeraphia vermiculata Bow. var. erecta Carter, I am
quite convinced that this variety as well as Axinella rugosa
Bow. (O. S.) is a true Axinella O. S. The reasons in favour
of this are, the well developed axis, ramuli radiating from it,.
and the spicules, which are typical for an Axinella O. S.
Carter also says with regard to this variety: »Internal
structure eonsisting of fasciculi branching and subdividing
obliquely from a central axis amidst the sarcode» etc., thus
per-fectly demonstrating its inner structure like that of an
Axinella O. S.
Bowerbank’s description of the genus Hymeraphia Bow.f
Mon. Brit. Spong., A7ol. 1, pag. 189, is following: »A single
basal membrane, whence spring numerous large separate
spicules, which pass through the entire thickness of the sarcodous
stratum to, or beyond the dermal surface of the sponge.» He
continues his description: »These pecularities of structure
indicate a common habit of extreme thinness in the species, and
sueh is in reality the condition of those with which we are
acquainted.» And then speaking about ali the species of
Hymeraphia Bow., described Vol. II, in respect to the thickness,
he says with regard to H. vermiculata »coating small pebbles.
None of them exceeded four lines in diameter, and the
thickness not more than that of a sheet of writing paper»; with
regard to H. clavata: »coating thin.....It is exceedingly
thin, and, in the dried state, can only be distinguished from
the dark periostracum of the shell by the grains of extraneous
matter. which are abundant on its surface.....»; with regard
to H. verticellata: »coating.....about two lines in thickness
.....»; H. stellifera : »coating.....exceedingly thin . . . .»T
it is evident, that the species described by Carter as H.
vermiculata Bow. var. erecta Carter is a true Axinella O. S. separated
from the genus Hymeraphia.
Probably H. vermiculata Bow. is also only a young form of
a species, that cannot but be an Axinella O. S. There is also
<< prev. page << föreg. sida << >> nästa sida >> next page >>
