. The Biological bulletin. Biology; Zoology; Marine biology. 374 J. H. SWINEHART AND K. W. SMITH P Mn. Figure 4. Scanning displays of P, Mn and Ca for a section of the shell of a specimen of A. califomiensis and a diagram of the limits of the periostracum and CaCOa-containing region. Fe shows an approximate correspondence with the regions occupied by Ca, Mn and P, but Fe is at lower levels than Mn and is contained in other regions as well. Infrared spectra of periostraca contained bands characteristic of P043~, and PO43" is found analytically (Lucena-Conde and Prat, 1957). Table I contain
. The Biological bulletin. Biology; Zoology; Marine biology. 374 J. H. SWINEHART AND K. W. SMITH P Mn. Figure 4. Scanning displays of P, Mn and Ca for a section of the shell of a specimen of A. califomiensis and a diagram of the limits of the periostracum and CaCOa-containing region. Fe shows an approximate correspondence with the regions occupied by Ca, Mn and P, but Fe is at lower levels than Mn and is contained in other regions as well. Infrared spectra of periostraca contained bands characteristic of P043~, and PO43" is found analytically (Lucena-Conde and Prat, 1957). Table I contains data on the weight percentages of Ca, Mn and P at various points in the periostracum of A. califomiensis as determined by electron micro- probe analyses; and the quantities (Ca + ), the weight per cent Ca that would occur if Mn was converted to Ca, and (Ca + )/P. The latter two quantities will be used later on in this paper. The Ca, Mn and P contents of the periostracum of U. novahollandae were measured. The P content of the periostracum was measured at 8 points and ranged between and , the Ca content between and and the Mn content between and The ratios of (Ca + )/P were considerably larger than those of A. califomiensis because of the extremely large Mn levels, but in no case were they less than the value for Ca3()2 itself. Phosphorus was not detectable in the CaC03-containing regions of the shells of either species. In the case of A. califomiensis, the mud and water surrounding the specimens were analyzed. The Mn and Fe contents of the mud based on dry weight were ± (4 determinations) and ± (3 determinations), Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard,
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