56 



THE DESEADO FORMATION OF PATAGONIA 



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Fig. 54. Comparative series of upper dentitions of Deseado and Santa Cruz Typotheria; a, Archaeohyrax patagonicus; 

 b, Hegetotheriuin mirabile; c, Prosotherium garzoni; d. Pachrukhos tnoyani: e. Arcliaeophylus patrius; /, Interatherium 

 extensum; g Protypotherium australe; /;, Argyrohyrax proavus; i, Eutruiliytherus spegazzinianus — all natural size. 



