Chara-marl of HttcMn, Herts. 597 



Family C3rtherid8B. 



Genus LiMNlCYTHERE, Bradj. 



Limnicythere inopinata (Baird), 

 (PI. XV. figs. 28, 29.) 



Cythere inopinata, Baird, 1850, Brit. Entom. p. 172, pi. xx. figs. 1, 

 1 a-e. 



Limnicyiliere inoinnata, Brady, 1868,Monogr. Rec. Brit. Ostrac. p. 419, 

 pi. xxix. figs. 15-18, pi. xxxviii. fig. 9, pi. xxxix, fig. 1 ; Brady, 

 Crosskey, and Eobertson, 1874, Monoar. Post-tert. Entom. p. 173, 

 pi. X. figs. 8-11 ; Brady and Xorman, 1839, Sci. Trans. R. Dubl. Soc. 

 ser. 2, vol. iv. p. 170. 



This species is now found inhabiting ditches, lakes, and 

 slowly running streams. It has been recorded from various 

 post-Tertiary clays of Scotland and England. 



L. inopinata is of frequent occurrence in the " freshwater " 

 bed of Hitchin. 



EXPLANATION OF PLATE XV. 



Fig. 1. Cydoajpris Icsvis (0. F. Miiller). Left valve, x 30. 



Fig. 2. Ditto.' Edge view. X 30. 



Fig. 3. Cyclocypris ylobosa (G. 0. Sars). Left valve. X 24. 



Fig. 4. Ditto. Edge view, x 24. 



Fig. 5. Cypris virens (Jurine). Left valve. X 24. 



Fig. 6. Ditto. Edge view, x 24. 



Fig. 7. Erpetocypris reptatis (Baird). Right valve. X 15. 



Fig. 8. Ditto. Edge view, x 15. 



Fig. 9. Pionocyjjris vicbia {0. F. Miiller). Left valve. X 30. 



Fig. 10. Ditto. Edge view, x 30. 



Fig. 11. I/yocypris gibba (Ramdohr). Left valve, x 30. 



Fig. 12. Ditto. Edge view, x 30. 



Fig. 13. llyocypris Bradii, G. O. Sars. Left valve. X 30. 



Fig. 14. Ditto. Edge view, x 30. 



Fig. lo. Ccmdona pubescens {Koch). Right valve. X 30. 



Fig. 16. Ditto. Edge view, x 30. 



Fig. 17. Ditto. Young form, left valve, x 30. 



Fig. 18. Candona lactea, Baird. Right valve. X 30. 



Fig. 19. Ditto. Edge view, x 30. 



Fig. 20. Candona Candida (O. F. Miiller), Plight valve, x 20. 



Fig. 21. Ditto. Edge view. X 20. 



Fig. 22. Candona Candida, var. tumida, Brady and Robertson. Left 



valve. X 30. 

 Fig. 23. Ditto. Edge view, x 30- 

 Fig. 24. Candona Candida, var. claviformis, Brady and Norman. Right 



valve. X 20. " 



Fig. 25. Ditto. Edge view, x 20. 

 Fig. 26. Darwinula Stevensoni, Brady and Robertson. Right valve 



X 30. 

 Fig. 27. Ditto. Edge view, x -SO. 



Fig. 28. Limnicythere iiiopitiata (Baird). Left valve, x 30. 

 Fig. 29. Ditto. Edge view, x 30. 



