PLATE a 



Phalcocythere spinosa sp. nov. 

 Figs, i, 2, 7, 8. Left, right, dorsal and ventral views, carapace, x 68. Holotype, Io. 4347. 

 Fpper Chocolate Clays (upper part), sample 24161, Zao River. 



Phalcocythere sp., cf. P. spinosa 



Figs. 3,4,9. Left, right and ventral views, carapace male, x 68. Io. 4230. Upper Eocene, 

 Lindi survey, 10-50 ft. above shore at Kitunga, Tanzania. 



Figs. 5, 6, 10. Left, right and dorsal views, carapace female, x 68. Io. 4231. Upper 

 Eocene, Lindi survey, 10-50 ft. above shore at Kitunga, Tanzania. 



Fig. 11. Muscle scars x 210, fragment of right valve female. Io. 4232. Upper Eocene, 

 Lindi survey, 10-50 ft. above shore at Kitunga, Tanzania. 



Phalcocythere horrescens (Bosquet) gen. nov. 



Fig. 12. Dorsal view of hinge x 183, left valve. Io. 4257. Lutetian IV (sample CAB 1002, 

 Keij 1957, P- J 9)> Grignon, Paris Basin. 



Fig. 13. Dorsal view of hinge x 183, right valve. Io. 4255. Lutetian IV (sample CAB 

 1002, Keij 1957, P- T 9)> Grignon, Paris Basin. 



Quadracythere (Hornibrookella) platybomus sp. nov. 



Figs. 14, 18. Right and dorsal view, carapace male, x 70. Holotype, Io. 4351. Upper 

 Palaeocene, sample 460-i, Sor Range, 8 miles east of Quetta. 



Figs. 15, 19. Right and dorsal views, carapace female, x 70. Paratype, Io. 4300. Upper 

 Palaeocene, sample 460-i, Sor Range, 8 miles east of Quetta. 



Quadracythere (Hornibrookella) directa sp. nov. 



Fig. 16. Left view, carapace male, x 70. Io. 4301. Green and Nodular Shales, sample 

 3403, Rakhi Nala. 



Fig. 17. Left view, carapace female, x 70. Holotype, Io. 4350. Green and Nodular Shales, 

 sample 3403, Rakhi Nala. 



