PLATE 19 



Gyrocythere exaggerata gen. et sp. nov. 



Figs. 1-4. Left, right, dorsal and ventral views, carapace female, x 68. Holotype, Io. 4331. 

 Upper Chocolate Clays (lower part), sample 24151, Zao River. 



Fig. 5. Muscle scars x 120 showing four adductors and a U-shaped frontal scar, right valve 

 female. Paratype, Io. 4280. Upper Chocolate Clays (lower part), sample 24148, Zao River. 



Fig. 6. Internal view to show radial pore canals, left valve male, x 134. Paratype, Io. 3126. 

 Upper Chocolate Clays (lower part), sample 2415 1, Zao River. 



Fig. 7. Internal view to show radial pore canals, right valve female, x 134. Paratype, 

 Io. 3124. Upper Chocolate Clays (lower part), sample 24148, Zao River. 



Fig. 8. Dorsal view of hinge x 145, left valve male. Paratype, Io. 3120. Upper Chocolate 

 Clays (lower part), sample 2415 1, Zao River. 



Fig. 9. Dorsal view of hinge x 145, right valve male. Paratype, Io. 3122. Upper Choco- 

 late Clays (lower part), sample 2415 1, Zao River. 



