PLATE III. 



FIGS. PAGE 



1. Trigonia ventricosa (Krauss) ... ... ... ... ... 91 



1. Eight valve; la, frontal aspect. Small kloof, three miles up 

 the left bank of Sunday's Eiver (14h). 



2. Trigonia Tcraussi sp. nov 95 



2. Left valve; 2a, frontal aspect. Most probably Sunday's 

 Kiver. 



3. Trigonia rogersi sp. nov. ... ... ... ... ... ... 99 



3. Eight valve ; 3a, frontal aspect. Bare slope W. 30 S. from 

 the middle of Barkly Bridge, on the farm Olif ant's Kop (20h). 



