Abstract
Abstract Based on morphological and biometric studies of available specimens of Obovothyris obovata from the upper Bathonian (Jurassic) beds of Bregille and of Digonella 'digona' from the lower Callovian (Jurassic) beds of Maizieres and Tarcenay, several external and internal characteristics are listed showing the differences between the two genera Obovothyris and Digonella. Biometric studies of several Digonella species for population analysis indicate the presence of three distinct population assemblages and the identification of a new species, Digonella sinuata, from the marls of Maizieres and Tarcenay of Callovian age.
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