10. Right valve. Cliff on Zoet Geneugd, Sunday's River (64h);
11, left valve. Cliff below the old school-house, right bank of
Sunday's River, Dunbrodie (319); 11a, flat antero-ventral sur-
face of both valves (319).

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82

12. Left valve; 12a, portion of surface in the lower part of the
valve, × 2. One mile north-east of Rawson Bridge, Zwartkop's
River (281).

Right valve. Wash-out 100 ft. above Coega station at a point
one mile north of Coega Hotel (441g).

15. Right valve; 15a, frontal aspect. Bezuidenhout's River (323).

FIGS.

PLATE III.

1. Trigonia ventricosa (Krauss)

...

...

1. Right valve; la, frontal aspect. Small kloof, three miles up
the left bank of Sunday's River (14h).

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91

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

3. Trigonia rogersi sp. nov.

3. Right valve; 3a, frontal aspect. Bare slope W. 30 S. from
the middle of Barkly Bridge, on the farm Olifant's Kop (20h).