FIGS.

1-3. Trigonia vau Sharpe...

PLATE VI.

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1. Left valve, dorsal aspect; 1a, umbonal region of the same
valve, x 2. Three hundred yards below Addo Drift (Tunbridge's),
left bank of Sunday's River (41h).

2. Right valve; 2a, dorsal aspect; 2b, frontal aspect. Same
locality (40h).

3. Interior of a right valve. Same locality (42h).

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115

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4. Right valve; 4a, frontal view; 4b, dorsal aspect of the umbonal
region of right valve and fragment of left valve, showing details
of sculpture. Above Modder Drift, Sunday's River. In the col-
lection of the Geological Society of London (No. 12006).

5. Left valve. From the South African Museum collection;
probably Sunday's River.