PLATE II. 



All the figures are magnified 25 diameters, except 7 c, 11 6, and 18 b, x 75 



diameters. 

 Fig. 



1. Gytherella Beyrichi, Reuss. Yar. Isevis, Jones & Sherborn. (Page 48.) 



a, Right valve ; b, edge view. 



2. Gytherella Beyrichi. Var. 2. (Page 48.) 



a, Right valve ; b, edge view. 



3. Gytherella Roemeri, Jones & Sherborn. (Page 47.) 



a, Right valve ; b, edge view ; c, end view of a carapace. 



4. Gytherella Reussii, Jones & Sherborn. Right valve. (Page 47.) 



5. Gytherella Beyrichi (Reuss). Var. 3. (Page 48.) 



a, Carapace, with left valve outwards ; b, edge view of carapace. 



6. Gytherella Beyrichi (Reuss). Var. 4. (Page 48.) 



a, Left valve ; b, edge view. 



7. Gytherella Beyrichi (Reuss). Var. 5. (Page 48.) 



a, Right (larger) valve ; b, edge view ; c, portion magnified. 



8. Gytherella Reussii, Jones & Sherborn. (Page 47.) 



a, Right valve ; b, edge view. 



9. Gytherella Beyrichi (Reuss). Var. 6. (Page 48.) 



a, Right valve ; b, edge view of carapace. 



10. Gytherella Muensteri (Roemer). (Page 47.) 



a, Left (small) valve ; b, edge view. 



11. Gythere arenosa, Bosquet. Var. (Page 27.) 



a, Right valve; b, portion magnified. 



12. Gythere transenna, Jones & Sherborn. Right valve. (Page 31.) 



13. Cythereis Prestwichiana, Jones & Sherborn. Left valve. (Page 33.) 



14. Cythereis Prestwichiana, Jones & Sherborn. (Page 33.) 



a, Right valve ; b, sectional view across the middle. 



15. Cythereis aranea, Jones & Sherborn. (Page 33.) 



a, Left valve ; b, ventral aspect of the carapace. 



16. Gythere scabropapulosa, Jones. Right valve. (Page 28.) 



17. Gythere scabropapulosa, Jones. Var. aculeata, J. & S. Right valve. (Page 28.) 



18. Bairdia Londinensis, Jones & Sherborn. (Page 17.) 



a, Right valve ; b, portion magnified. 



19. Cytheropteron triangulare (Reuss). (Page 44.) 



a, Right valve ; b, dorsal aspect of right valve ; c, end view of carapace. 



20. Krithe Londinensis, Jones & Sherborn. (Page 41.) 



a, Left valve ; b, ventral aspect of carapace. 



