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Keywords: Belemnotheutis phragmocone 1.jpg Belemnotheutis invested with the external integument; at a a a is seen the corneo-calcareous layer which lies beneath To the right is slightly magnified to show the striated surface; a marks a denuded space exposing the internal layer http //books google com/books id tGwOAAAAIAAJ printsec frontcover v onepage q f false Philosophical Transactions of the Royal Society of London For the Year MDCCCXLVIII Part I Gideon Mantell 1848 PD-old-100 Belemnotheutis |