DECALCIFICATION of mother-of-pearl from recent molluscs leaves soft, stratified membranes of concholin. These membranes, cleaved and broken by ultrasonic vibrations, appear in the electron microscope ...

THE shell in the Lamellibranchia consists of a number of distinct layers which show a fundamental similarity in structure in related regions of valve and ligament 1. In Anodonta, all parts of the ...