The structure of the shell of the pelecypod Mytilus californianus varies with the temperature of its formation. This species has a shell composed of four principal layers, the periostracum (entirely ...
RED fluorescence due to porphyrins in molluscan shells has been known for some years (Furreg and Querner, 1929 ; Fischer, 1930, 1934, 1937 ; Waldenstrom, 1937; Tixier, 1945) ; but its exact ...
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