Twenty-nine characters were measured on each of 372 individuals of Triticites cullomensis from thirty-one samples collected at twelve localities in the Beil Member of the Lecompton Formation of northeastern Kansas and adjacent areas. Analysis of variance and Student-Newman-Keuls tests showed statistically significant intraspecific differences in size among populations. Large populations were found in rocks deposited under conditions interpreted as unfavorable for T. cullomensis, whereas small populations came from favora- ble paleoenvironments. This relationship of size to environment is unlike that commonly assumed for macroinvertebrates and bears out the work of John S. Bradshaw and Robert R. Lankford, who have found similar relationships between size and environment in popu- lations of Recent foraminifera.
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