PLATE XVI. 



PAGE 



Figs. 1-4. Bythocypris subaequata n. sp 116 



1. Eig'ht side of an entire carapace. Upper Marlboro. 



2. Dorsal view of same. 



3. Anterior view of same. 



4. Inner side left valve showing internal marginal plaite. 



Figs. 5-8. Bythocypeis paeilis n. sp 117 



5. Eight side of entire carapace. Upper Marlboro. 



6. Ventral edge of same. 



7. Inner side of right valve. 



8. Inner side of left valve. 



Figs. 9-13. Cythekella maelboroensis n. sp 117 



9. Left side of a perfect carapace. Upper Marlboro. 



10. Eight side of another specimen from same locality. 



11. Dorsal view in outline of same. 



12. Inner side of a right valve. 



13. Anterior end view^. 



Figs. 14-15. Cytheeella submaeginata n. sp 118 



14. A left valve showing slight mesial depression and marginal rim. 



Upper Marlboro. 



15. Ventral view of same. 



Figs. 16-18. Cythere jiarylandica n. sp 119 



16. Posterior end view^ of an entire carapace. Upper Marlboro. 



17. Eight side of same. 



18. View of ventral edge of same. 



Figs. 19-21. Cythereis bassleri n. sp 120 



19. An average left valve of this species. 



20. Ventral edge of an entire carapace. 



21. Outline view of anterior end of same. 



Figs. 22-23. Cytheridea perarcuata n. sp 121 



22. View of a right valve. 



23. Ventral edge of same. 



All the figures are magnified 20 diameters. 



268 



