56 THE DESEADO FORMATION OF PATAGONIA 
Fig. 24. Comparative series of upper dentitions of Deseado and Santa Cruz Typotheria; a, Archaeohyrax patagonicus; 
b, Hegetotherium mirabile; c, Prosotherium garzoni; d. Pachrukhos moyani: e. Archaeophylus patrius; /, Interatherium 
extensum; g Protypotherium australe; h, Argyrohyrax proavus; 7, Eutrachytherus spegazzinianus—all natural size. 
