. Bulletins of American paleontology. cies. The specific percentages given above will,of course, not be present in every Central Interior sam-ple, but T. conradina must be more abundant than for a sample to be classified as Central in which B. dominates belong to theCentral Exterior Biofacies. The relative importance of the three major taxa, B. and C. muscarum, also varieswithin the Central Interior area. Near the northern edgeof the biofacies, some samples have the three majortaxa making up over 80% of the whole, while at theouter edg

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. Bulletins of American paleontology. cies. The specific percentages given above will,of course, not be present in every Central Interior sam-ple, but T. conradina must be more abundant than for a sample to be classified as Central in which B. dominates belong to theCentral Exterior Biofacies. The relative importance of the three major taxa, B. and C. muscarum, also varieswithin the Central Interior area. Near the northern edgeof the biofacies, some samples have the three majortaxa making up over 80% of the whole, while at theouter edge of the area the percentage drops to 32-45%.The definitive feature is the dominance of T. conra-dina. TRANSITION FROM THE NORTHERN BIOFA-CIES: The transitional nature of all boundaries be-tween biofacies needs emphasis. Faunas from the cen-tral part of any biofacies are normally easy to assign,but as we approach a neighboring biofacies, the faunasgradually shift from one biofacies toward the next. MoLLUSK Shells in Florida Bay: Shaw.

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