PLATE I. 



All the figures are magnified 25 diameters, except 17 b, X 75 diameters. 



Fig. 



1. Cy there recur ata, Jones & Sherborn. Left valve. (Page 21.) 



2. Cytheridea punctillata, Brady. Right valve. (Page 39.) 



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



a, Right valve ; b, approximate outline of left valve. 



4. Cythere villosa, G. 0. Sars. Var. (Page 25.) See also Plate III, figs. 12, a, b, c. 



a, right valve ; b, right valve, ventral aspect. 



5. Cythere polyptycha, Reuss. Var. Right valve. (Page 29.) 



6. Cythere latimarginata, Speyer. Left valve. (Page 27.) 



7. Cythereis Hoernesi, Speyer. Right valve. (Page 32.) 



8. 9, 10, 11. Cypridea spinigera (Sowerby). (Page 14.) See also Plate III, 



figs. 1 a, b. 



8, Carapace crushed, hence the apparent overlap; 9, left valve; 10, 11, 

 right valves. 



12. Cytherideis gracilis (Reuss). (Page 46.) 



13. Pontocypris, sp., and Xestoleberis Colwellensis, Jones & Sherborn. 



a, P., sp. Right valve. (Page 16.) b, X. Colwellensis, left valve; c, ventral 

 aspect of the carapace. (Page 41.) 



14. Cytheridea perforata (Roemer). Left valve. (Page 39.) 



15. Bairdia subdeltoidea (Miinster). (Page 16.) 



a, Carapace, right valve outwards ; b, perfect, ventral aspect. 



16. Cytheridea debilis, Jones. Right valve. (Page 38.) 



17. Cythere gyriplicata, Jones & Sherborn. (Page 30.) 



a, Right valve ; b, portion magnified. 



18. Cythere plicata, Miinster. Var. Right valve. (Page 29.) 



19. Bythocypris subreniformis, Jones & Sherborn. (Page 16.) 



a, Carapace showiDg the left valve ; b, perfect, ventral aspect. 



20. Cytherura Prestwichiana, Jones & Sherborn. (Page 43.) 



a, Right valve ; b, right valve, ventral aspect. 



21. Cythere costellata (Roemer). Var. triangulata, J. & S. Left valve. (Page 30.) 



22. Cythereis cornuta (Roemer). Right valve. (Page 35.) 



23. Cythere venustula, Jones & Sherborn. (Page 20.) 



a, Left valve ; b, left valve, ventral aspect. 



24. Cytherella Dixoni, Jones & Sherborn. (Page 47.) 



a, Carapace showing the smaller (left) valve ; b, end view of carapace ; 

 c, carapace showing the left valve; d, edge view of a right (large) 

 valve. 



