The analyses referred to the a coefficient of the allometry equation (y=axb) show a differentiation between distinct morphologies (A, B, C). Such differentiation seems to be clearer in the pliocenic forms than in the recent ones. Concerning to the b exponent of this equation, an unification between the three morphologies is observed, althoug the C forms are always more allometrical negatives than the A ones. The B forms, when present (recent forms), can adopt either values comprised in those A

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... nd C (but more identifiables with the C ones) or values nearer to the isometry of the C forms