WIGLEY and STINTON: REMAINS FROM MARINE SEDIMENTS 



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ANACHIS COSTULATA 



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HJMTRA'S VINCOO 



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BALCIS INTERMEDIA 



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COLUS PyGM4fUS 



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CREPIOULA FORNICATA 



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IPOO METERS 



CRUCIBULUM STRIATUM 



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CYLICHNA ALBA 



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ZPITONIUM DALLIANUM 



Figure 18. — Geographic distribution of the common gastropods. 



21 



