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pectinata and Philomedes (Ph.) globosa; cf. p. 146 of this treatise) is in favour of the first
alternative. For this reason I have not adopted the statement as to length given by G. O. Sars.
I give for what it is worth G. O. Sars’s information as to the shell: „altitudine maxima . . . ante
medium sita“ and the Statements that „antennae, pedes mandibulares et maxillae structura fere
exacta eadem ac in A. norvegica“ and „laminae postabdominales breves unguibus 5 . . . armatae“.
G. S. Brady and The description of this species given by G. S. Brady and A. M. NORMAN, 1896, p. 636,
i .u. A armant . , translation of Sars’s original description into English. Two figures of the shell, one
species representing the side view, the other the shell as seen from below, are added by these authors,
pl. LII, figs. 18, 19. The figures were drawn from a specimen of whicli it is stated that it was
„kindly given to us by the describer“, i. e. presumably the same specimen as is re-described
and reproduced by me above. Of these two figures no. 18, that of the shell seen from the side,
shows a fairly close resemblance to fig. 1 given by me above, the other figure, the shell seen from
below, differs, on the other hand, very considerably from the corresponding figure given by me.
This is perhaps due to the superficial way in which these writers have proceeded. It does
not seem impossible, however, that there has been a confusion between the figures and that pl. LII,
fig. 17, A. elliptica, the shell seen from below, represents A. abyssicola, while fig. 19 belongs to A.
elliptica. At any rate, if this change were carried out, there would be considerably doser agreement
between the figures given by Brady and NORMAN and the forms that are actually found in nature.
Distribution: — Lofoten, Norway; depth, 220 m. (Sars 1870). Between Finmark
and Beeren Island (Station 290 of the Norwegian North-Atlantic Expedition
1876—1878); depth, 345 m. (SARS 1886).
Type specimen of the re-description on slides in the Chr. Z. M.
Genus Cyclasterope G. S. Brady.
Cydasterope, G. S. Brady, 1897. Asterope, G. W. MÜLLER, 1890 and 1912.
Cylindro-leberis, G. W. Müller, 1906 b.
Diagnosis: — Shell: — This varies very much in type. In most cases, but not always,
however, it has a well-marked posterior corner. The rostral incisur is comparatively deep and
narrow. The surface of the shell has no sharply projecting scivlpture; it is almost smooth. It
is strongly calciferous. The forms are relatively large.
First antenna: — Disto-posteriorly on the fourth joint there are more than two
bristles, some of which are rather long. The sensory bristle of the fifth joint is very powerful
in the male and has a very large number of accessory sensoria! filaments on the medial side of
the bristle, arranged in numerous more or less distinct stages. This antenna has seven bristles
distally, both the d- and e-bristles are developed; the a-bristle is claw-shaped; the c- and f-bristles
are much lengthened in the male.
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