Emphasis is denotes as _Italic_ and =Bold=. Most small caps text has been converted to ALL CAPS; but where some may have been rendered as Mixed Case letters where it seemed appropriate.] [Illustration: FIG. 1.--THE SCALLOP SHELL, _Pecten Opercularis_ (see page 107), SLIGHTLY REDUCED IN SIZE. THE LARGER SHELLS ARE FROM DOUGLAS, ISLE OF MAN; THE SMALLER SHELLS ARE YOUNG SPECIMENS FROM LLANDUDNO, NORTH WALES.]…
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