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Dear Mike,
The pictures are indeed, unfortunately, not 100% clear to me-I wish I
had the specimens in my hand to turn them around so I could view them
from any angle I wanted. So what I'm going to suggest now may not be
correct at all, but the specimens remind me of rajiform teeth as
possessed by e.g. dasyatids, pristids and mobulids. If this is true, you
have always considered the specimens upside down. Examples of figures
and references of these such rajiform teeth are in Monsch (1998,
Palaeo-3, 143: 31-50). A standard reference work is still Cappetta's
(1987) 'Chondrichthyes II' in Handbook of Paleoichthyology. But you
probably knew this.
Good luck,
Ken
--
==================================================================
Dr. K.A. Monsch tel: +48-(0)71-3754017
fax: +48-(0)71-3222817
Department of Vertebrate Zoology
Institute of Zoology
University of Wrocław
ul H. Sienkiewicza 21
50-335 Wroclaw
POLAND
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