Figures 



Plate 4 



1-2. Alatacythere alata a'Aantica (Schmidt) (p. 13) 



1. Left valve, exterior, x 55, Loc. A, U.S.N.M. 128936 



2. Dorsal view, complete specimen, x 59, Loc. A, U.S.N.M. 128937 

 3-4. Brachycythere nausiformis Swain (p. 12) 



3. Right valve, interior, male, x 61, Loc. I, U.S.N.M. 128929 



4. Right valve, exterior, female, x 57, Loc. I, U.S.N.M. 128930 

 , 8-10. Brachycythere rhomboidalis (Berry) (p. 11) 



5. Left valve, exterior, x 66, Loc. B, U.S.N.M. 128925 



8. Right side view, complete specimen, x 54, Loc. A, U.S.N.M. 128926 



9. Exterior view, abraded left valve, x 54, Loc. C, U.S.N.M. 128927 



10. Dorsal view, right valve showing dentition, x 57, Loc. E, U.S.N.M. 



128928 



6. Brachycythere ledaforma (Israelsky) (p. 12) 



Right side view, complete specimen, x 62, Loc. H., U.S.N.M. 128932 



7. Brachycythere plena Alexander (p. 12) 



Right valve, exterior, x 58, Loc. E, U.S.N.M. 128931 

 11-13. Brachycythere raleighensis Brown, n. sp. (p. 13) 



11. Right side view, holotype, x 61, Loc. A, U.S.N.M. 128933 



12. Ventral view, paratype, x 55, Loc. F, U.S.N.M. 128934 



13. Dorsal view, paratype, x 63, Loc. F, U.S.N.M. 128935 

 14-15. Progonocy there caswellensis Brown, n. sp. (p. 16) 



14. Left valve, exterior, holotype, x 52, Loc. C, U.S.N.M. 128964 



15. Right valve, exterior, paratype, x 53, Loc. C, U.S.N.M. 128965 



16. Brachycythere sphenoides (Reuss) (p. 11) 



Right side view, complete specimen, x 60, Loc. K, U.S.N.M. 128924 



