PLATE VII. 



FIGS. PAGE 



1. Trigonia siowi sp. nov 115 



Eight valve. Cliff W. 20 S. from Comley's House, Sunday's 

 Eiver (90h). 



2-4. Trigonia conocardiiformis (Krauss) ... ... ... ... 119 



2. Left valve; 2a, dorsal aspect; 2b, the same, x 2. Cliff on the 

 right bank of Sunday's Eiver, on Commando Kraal (104h). 



3. Left valve. Sunday's Eiver. 



4. Left valve, incomplete posteriorly. Hallway cutting between 

 milestones 24J-24f on the line from Uitenhage to Graaff-Eeinet, 

 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. Cardita nuculoides Tate ... ... ... ... ... ... 127 



5. Left valve ; 5a, frontal aspect ; 5b, portion of surface orna- 

 mentation 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 ... ... ... ... 135 



6. Eight valve; 6a, umbonal part x 2, showing concentric 

 sculpture. Coega Eiver. 



7, 8. AntJionya lineata sp. nov 137 



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 

 Eiver (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). 



), 10. Tancredia schwarzi sp. nov. ... ... ... ... ... 139 



9. Left valve ; 9a, frontal view. Cliff W. 20 S. from Comley's 

 House, Sunday's Eiver (95h). 



10. Eight valve. Kloof on the left side of Zwartkop's Eiver, 

 east-north-east of Eed House (324). 



11 TJietironia papyracea (Sharpe) 142 



11. Eight valve; lla, portion of surface in the posterior half of 

 the valve, x 2. Coega. 



12. TJietironia oblonga sp. nov. 146 



12. Eight valve ; 12a, frontal aspect ; 126, dorsal aspect. Kloof 

 S. 5 W. from Comley's House, right bank of Sunday's Eiver (83h). 



13. Trapezium ? tatei sp. nov 148 



13. Left valve ; 13a, frontal aspect. Left side of Coega Valley, 

 half a mile down from the railway (452g). 



14. Meretrix uitenhagensis sp. nov 151 



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 

 Eiver (30h). 



