1. Right valve; la, part of surface x 4. Grass Ridge, three
miles east-north-east of Uitenhage, Zwartkop's River valley (310).

2. Right valve; 2a, dorsal view. Cliff on Buck Kraal, Sunday's
River (141h).

3. Left valve; 3a, dorsal view. Same locality (141h).

4. Pleuromya baini Sharpe

...

...

...

...

PAGE

151

156

4. Right valve; 4a, portion of surface × 4. Kloof behind Col-
chester, Sunday's River (495g).

Right valve. Railway cutting between milestones 243-243 on the
line from Uitenhage to Graaff-Reinet, about three miles from
Uitenhage (331).

6, 7. Turbo atherstoni Sharpe 6a. Apertural aspect.

Cliff below the old school-house on the
right bank of Sunday's River, Dunbrodie (351).
7. An immature specimen; 7a, x 2; 7b, apertural aspect, × 2.
Same locality and number.

8a. Apertural aspect; 8b, the same view as fig. 8, x 2. Cliff
below the old school-house on the right bank of Sunday's River,
Dunbrodie (282).

167

9a. Apertural aspect; 9b, the same, x 2. Cliff below the old
school-house on the right bank of Sunday's River, Dunbrodie
(305).

10. Natica uitenhagensis? sp. nov.

10a. Apertural aspect. Railway cutting between milestones
24-243 on the line from Uitenhage to Graaff-Reinet, about three
miles from Uitenhage (350).

11. Natica uitenhagensis sp. nov.

...

...

...

171

11a. Apertural aspect. Zwartkop's River. Specimen in the col-
lection of the Geological Society of London.