Fig. 28. Carpus and tarsus of Permian genera in comparison with tlio.se of tlie embryonic 

 Echidna and Didelphis. 



Carpi: Nos. 1-6 after Broom, 7 after Seeley (specimen distorted), S-9 after Emery. 

 Tarsi: No. 1 after Broom, nos. 2' and 3 after Emery. 



Abbreviations: Carpus. 



R., radius. 

 U., ulna. 



r., radiale (scaplioid of mammals). 

 i., intermedium (lunar). 

 u., ulnare (imciform). 



C^ C- centrale (one or both together homolo- 

 gous with the centrale of maminals). 

 p.px., "prepoUex." 



1, carpale 1 (trapezium). 



2, " 2 (trapezoid). 



5, " 3 (magnum). 

 4, " 4 (unciform). 



6. " 5 (disappears or fuses witli no. 4). 

 I-V, metacarpals. 



Abbreviations: Tarsus 



(441) 



