FIGS.

1-3. Trigonia vau Sharpe...

PLATE VI.

...

...

1. Left valve, dorsal aspect; 1a, umbonal region of the same
valve, 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).

4, 5. Trigonia stowi sp. nov.

...

...

...

...

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.

PAGE

110

115

FIGS.

1. Trigonia słowi sp. nov.

...

Right valve. Cliff W. 20 S. from Comley's House, Sunday's
River (90h).

2-4. Trigonia conocardiiformis (Krauss)

PAGE

115

119

...

2. Left valve; 2a, dorsal aspect; 2b, the same, x 2. Cliff on the
right bank of Sunday's River, on Commando Kraal (104h).
3. Left valve. Sunday's River.

4. Left valve, incomplete posteriorly. Railway cutting between
milestones 24-24 on the line from Uitenhage to Graaff-Reinet,
about three miles from Uitenhage (297). To compare with fig. 3,
for rib-development. A fragment of Serpula pinchiniana Tate is
adhering to the valve.

5. Left valve; 5a, frontal aspect; 5b, portion of surface orna-
mentat n from the middle of the lower half of the valve, x 10.
Left side of Coega Valley, half a mile down from the railway
(466g).

6. Astarte (Eriphyla) pinchiniana Tate

...

127

6. Right valve; 6a, umbonal part × 2, showing concentric
sculpture. Coega River.

7. Cast of interior of a left valve. Bare slope W. 30 S. from the
middle of Barkly Bridge, on the farm Olifant's Kop, Sunday's
River (35h).

8. Drawn from a wax impression of the mould of the external
surface of a left valve. Left side of Coega Valley, half a mile
down from the railway (461g).

9, 10. Tancredia schwarzi sp. nov.

9. Left valve; 9a, frontal view.
House, Sunday's River (95h).

10. Right valve. Kloof on the left side of Zwartkop's River,
east-north-east of Red House (324).

11 Thetironia papyracea (Sharpe)

139

11. Right valve; 11a, portion of surface in the posterior half of
the valve, × 2. Coega.

12. Thetironia oblonga sp. nov.

...

...

...

12. Right valve; 12a, frontal aspect; 12b, dorsal aspect. Kloof
S. 5 W. from Comley's House, right bank of Sunday's River (83h).

13. Left valve; 13a, frontal aspect. Left side of Coega Valley.
half a mile down from the railway (452g).

14. Left valve; 14a, dorsal aspect. Bare slope W. 30 S. from
the middle of Barkly Bridge, on the farm Olifant's Kop, Sunday's
River (30h).