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The relationship between ponderal index and cranial variables has been analyzed using 321 skulls and specimen records from the Terry skeletal collection. To represent the two trait classes commonly used in skeletal biological studies, nonmetric and metric, 61 discrete traits and 23 skull measurements were used. Individual trait correlations were assessed with the effects of age held constant (partial correlation), and with ponderal index and age considered jointly (multiple correlation). Correlations were quite low on the average, and rarely statistically significant. Ponderal index is no more highly correlated with cranial measurements than with discrete characters. Trait correlations with ponderal index were higher among females than among males.