PLATE III. 



FIGS. 



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



1. Right valve; la, frontal aspoct. Small kloof, three miles up 

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



2. Trigonia. kraussi sp. nor. ... ... ... 95 



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

 River. 



3. Trigonia rogersi sp. nov ... 99 



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

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



