Plate 7 



Figures 



1-3. Cytheridea (Haplo cytheridea) sarectaensis Brown, n. sp. (p. 17) 



1. Left valve, exterior, female, x 53, Loc. E, U.S.N.M. 128968 



2. Ventral view, holotype, x 54, Loc. E, U.S.N.M. 128969 



3. Right valve, exterior, paratype, male, x 47, Loc. E, U.S.N.M. 128970 

 4-9. Cytheridea (Haplocytheridea) wilmingtonensis Brown, n. sp. (p. 18) 



4. Dorsal view, paratype, x 61, Loc. A, U.S.N.M. 128979 



5. Ventral view, paratype, x 68, Loc. A, U.S.N.M. 128980 



6. Left valve, interior, x 67, Loc. A, U.S.N.M. 128981 



7. Left side view, holotype, x 73, Loc. A, U.S.N.M. 128982 



8. Dorsal view, left valve showing dentition, x 73, Loc. A, U.S.N.M. 



128983 



9. Dorsal view, paratype, x 78, Loc. A, U.S.N.M. 128984 

 10-14. Trachyleberis bassleri (Ulrich) (p. 13) 



10. Right valve, exterior, x 48, Loc. F, U.S.N.M. 128938 



11. Left side view, complete specimen, x 49, Loc. A, U.S.N.M. 128939 



12. Right side view, complete specimen, x 55, Loc. F, U.S.N.M. 128940 



13. Ventral view, instar, x 58, Loc. A, U.S.N.M. 128941 



14. Dorsal view, x 53, Loc. F, U.S.N.M. 128942 

 15-19. Trachyleberis gapensis (Alexander) (p. 14) 



15. Right side view, female specimen, x 64, Loc. I, U.S.N.M. 128947 



16. Right side view, male specimen, x 63, Loc. I, U.S.N.M. 128948 



17. Right valve, interior, male, x 60, Loc. I, U.S.N.M. 128949 



18. Ventral view, x 63, Loc. H, U.S.N.M. 128950 



19. Dorsal view, x 75, Loc. A, U.S.N.M. 128951 

 20-25. Trachyleberis (?) praecursora Brown, n. sp. (p. 15) 



20. Right side view, holotype, x 66, Loc. A, U.S.N.M. 128952 



21. Left side view, paratype, x 66, Loc. F, U.S.N.M. 128953 



22. Left valve, interior, paratype, x 68, Loc. F, U.S.N.M. 128954 



23. Dorsal view, paratype, x 72, Loc. A, U.S.N.M. 128955 



24. Ventral view, paratype, x 67, Loc. A, U.S.N.M. 128956 



25. Dorsal view, left valve, paratype, x 66, Loc. A, U.S.N.M. 128957 

 26-27. Trachyleberis pidgeoni (Berry) (p. 14) 



26. Right valve, exterior, male, x 60, Loc. A, U.S.N.M. 128945 



27. Left valve, exterior, female, x 59, Loc. A, U.S.N.M. 128946 



