. Bulletins of American paleontology. (2)mud content of the sediments and (?) salinity of sur-face water. Depth of Water WATER DEPTH AND INDIVIDUAL TAXA: Text-figures 26-28 show the changes in the numbersof TransennelUi conrcidiiui. Brachidontes exiistiis andParviliicinti miililliiwiiki with depth. Text-figure 26shows that 7. coiircidiiia increases in abundance withincreasing water depth to a maximum at about 8 feet( m), below which its numbers sharply specimens have been found to 19 feet ( m).Bnichidontes exiistus (Text-fig. 27), on the other hand,reaches its maximum at ab
. Bulletins of American paleontology. (2)mud content of the sediments and (?) salinity of sur-face water. Depth of Water WATER DEPTH AND INDIVIDUAL TAXA: Text-figures 26-28 show the changes in the numbersof TransennelUi conrcidiiui. Brachidontes exiistiis andParviliicinti miililliiwiiki with depth. Text-figure 26shows that 7. coiircidiiia increases in abundance withincreasing water depth to a maximum at about 8 feet( m), below which its numbers sharply specimens have been found to 19 feet ( m).Bnichidontes exiistus (Text-fig. 27), on the other hand,reaches its maximum at about two feet ( m), thenholds at counts above in two liters of sedimentto depths of eight feet ( m) where it, too, abruptlybecomes uncommon. We did not find it deeper feet ( m). Parvihicina miiltilineota () has a different pattern. It peaks at a little over fourfeet ( m), which is deeper than Brachidontes andshallower than Transennella. Also unlike those two, it MoLLUSK Shells in Florida Bay: Shaw. —A tloodcii plu>a on Piirk Ko>. January 29, gradually decreases in numbers to about feet (). These three graphs were selected to show that thenumbers of these taxa vary in individual ways withdepth of water. In this respect they are surrogates forall taxa for which adequate data are in hand. Each hasa prefened depth, but the fact that a taxon is notabundant everywhere at this depth shows that depthalone does not completely control taxon T. conradina and Brachidontes are most abun-dant at depths of about eight feet ( m), but not inthe same places (Text-figs. 9. 11). WATER DEPTH AND BIOFACIES: Just as depthdoes not completely control the distribution of any tax-on, neither does it control the distribution of the bio-facies by itself. Text-figure 29 is a plot of the range ofdepths at which we found each of the marine bars are arranged in order of increasing depth ofits shallowest appearance. This ar
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