EXPLANATION OF PLATES. 57 



Fig. 3. Cythere simplex, Norman ; seen from below, X 40. 



Fig. 4. ,, ,, ,, end view, x 40. 



Fig. 5. Cythere Bradii, Norman; left valve, x 40. 



Fig. 6. ,, ,, ,, seen from above, X 40. 



Fig. 7. „ „ „ seen from below, x 40. 



Fig. 8. ,, ,, ,, end view, x 40. 



Fig. 9. Cythere declivis, Norman ; left valve, x 40. 



Fig. 10. ,, „ „ seen from above, x 40. 



Fig. 11. ,, ,, ,, seen from below, x 40. 



Fig. 12. „ „ „ end view, X 40. 



Fig. 13. Cythere lsevat a, Norman; left valve, x 40. 



Fig. 14. ,, „ ,, seen front above, x 40. 



Fig. 15. ,, ,, „ seen from below, x 40. 



Fig. 16. „ „ „ end view, X 40. 



Fig. 17. Cythere cellulosa, Norman ; left valve, x 40. 



Fig. 18. „ „ ,, seen from above, x 40. 



Fig. 19. ,, „ „ seen from below, X 40. 



Fig. 20. „ „ „ end view, x 40. 



PLATE VI. 



Fig. 1. Cytherei? limicola, Norman ; left valve, X 50. 



Fig. 2. ,, ,, ,, seen from above, x 50. 



Fig. 3. ,, ,, „ seen from below, x 50. 



Fig. 4. „ ,, „ end view, X 50. 



Fig. 5. Cythere latissima, Norman; right valve, x 50. 



Fig. 6. „ „ „ seen from above, x 50. 



Fig. 7. „ ,, ,, seen from below, *x 50. 



Fig. 8. ,, „ „ end view, X 50. 



Fig. 9. Cythere guttata, Norman ; left valve, x 50. 



Fig. 10. „ „ „ seen from above, x 50. 



Fig. 11. ,, „ ,, seen from below, x 50. 



Fig. 12. ,, „ „ end view, X 50. 



Fig. 13. Cythere multifora, Norman; left valve, x 50. 



Fig. 14. „ „ ,, seen from above, x 50. 



Fig. 15. „ ,, „ seen from below, X 50. 



Fig. 16. ,, ,, ,, end view, X 50. 



Fig. 17. Cythere cellulosa, Norman ; left valve, x 85. 



PLATE VII. 



Cythereis Dunelmensis, Norman ; left valve, X 40. 



„ „ „ seen from above, X 40. 



„ „ „ seen from below, x 40. 



,, ,, ,, end view, x 40. 



Fig. 



1. 



Fig. 



2. 



Fig. 



3. 



Fig. 



4. 



