PLATE III. 



All the figures are magnified 25 diameters, except 2 c, 3 b, and 15 c, X 75. 



Fig. 



1. Cypridea spinlgera (Sowerby). (Page 14.) 



«, Left valve of a young individual ; b, ventral aspect of a perfect carapace 

 from the Weald Clay of Punfield, Dorset. 



2. Aglaia ? cypridoides, Jones & Sherborn. (Page 12.) 



a, Right valve ; b, edge view ; c, muscle spot, magnified. 



3. Bairdia ovoidea, Jones & Sherborn. (Page 18.) 



a, Left valve ; b, muscle spot magnified. 



4. Cy there consobrina, Jones. (Page 20.) 



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



5. Cythere Reidii, Jones & Sherborn. (Page 23.) 



a, Left valve ; b, ventral aspect. 



6. Cythere retifastigiata, Jones. Var. cequior, Jones & Sherborn. (Page 23.) 



a, Left valve ; b, ventral aspect. 



7. Cythere lachrymalis, Jones & Sherborn. (Page 26.) 



a, Left valve ; b, ventral aspect. 



8. Cythere dictyosigma, Jones. (Page 24.) 



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



9. Cythere trachypora, Jones. (Page 24.) 



a, Left valve ; b, ventral aspect. 



10. Cythere Charlesworthiana, Jones & Sherborn. Right valve (damaged). (Page 



21.) 



11. Cythere baccata, Jones & Sherborn. (Page 26.) 



a, Right valve ; b, left valve ; c, dorsal aspect of carapace ; d, ventral 

 aspect of carapace. (The same individual.) 



12. Cythere villosa, Gr. 0. Sars. (Page 25.) See also Plate I, figs. 4 a, b. 



a, Left valve ; b, ventral aspect of carapace ; c, hinder portion of a left 

 valve of another individual. 



13. Cythere Icesa, Jones & Sherborn. (Page 25.) 



a, Left valve ; b, ventral aspect. 



14. Cythere Woodwardiana, Jones & Sherborn. (Page 23.) 



a, Left valve ; b, ventral aspect. 



15. Cythere angidatopora (Reuss). (Page 22.) 



a, Left valve ; b, ventral aspect ; c, left valve, portion magnified. 



16. Cythere delirata, Jones & Sherborn. (Page 28.) 



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



17. Cythere Bosquetiana, Jones & Sherborn. (Page 22.) 



a, Left valve ; b, ventral aspect. 



18. Cythere Forbesii, Jones & Sherborn. (Page 31.) 



a, Left valve ; b, carapace open to show interior and ligament. 



19. Cythereis corrugata (Reuss). Var., Jones & Sherborn. (Page 32.) 



a, Right valve ; b, ventral aspect. 



20. 21, 22. Cytheridea elongata, Brady. (Page 38.) 



a. Right valve ; b, dorsal aspect of carapace; 21. Left valve ; 22. Right 

 valve. 



23. Xestoleberis aurantia (Baird). Var., Jones & Sherborn. (Page 42.) 



a, Carapace showing the right valve ; b, dorsal aspect of carapace. 



24. Cytherura clathrata, G. O. Sars. (Page 44.) 



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



25. Cytherella, sp. (Page 48.) 



a, Right valve ; b, edge view. 



