Abstract
Measurements of some Recent and Pleistocene felid skulls were submitted to statistical analysis with particular reference to the relative growth method. The use of this method is demonstrated and its implications are discussed. Its application as a phylogenetic tool was tested on the Merycoidodontidae. Its chief use is shown to be as a tool for making comparisons between parts which cannot be observed directly. Clues as to causes of extinction in certain genetic lines were obtained by comparing the relative growth coefficients. The relative variation in spp., genera, and a family are indicated by computed values for the Pearson coeff. of variation.

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