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■ SUMMARY
THE BILVALVE CENERA CUNOCARDIUM AND
VeNERUPIS IN lCELAND
The lcelandic name of the heterodont bivalve
Clinocardium ciliatum is discussed. It is con-
cluded that it cannot be used also as a synonym
for the dysodont Chlamys islandica as done in
some recenlly published Icelandic dictionaries.
The Pliocene deposits on western Tjörnes,
North Iceland, were divided into three biozones
by Guðmundur G. Bárðarson in 1925, the zona-
tion being based on the distribution of marine
bivalves within the sediments. He named them
the basal Tapes Zone, the central Mactra Zone
and the uppermost Cardium groenlandicum
Zone. Three species oíTapes, now referred to as
Venerupis, have been found in the Tapes Zone of
the Tjömes deposits. These are Venerupis
aurea, V. rhomboides and V. pullastra. Two of
them, i.e. Venerupis pullastra and V. rhombo-
ides, have also been found in the Mactra Zone.
These species are all living today and rather com-
mon around the British Isles, but they are not
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