PLATE IX. 



CRETACEOUS SPECIES. 



Fig. 



] to 8. Terebratula Tornacensis, var. Roemeri, D'Arc/iiac. A dwarf race, from the 



Farringdon Sponge Sand and Gravel. See also 

 PL VII, figs. 11—16. 



9 to 24. ,, depressa, Lamarck. A series of shapes, age, and varieties, from 



the Parringdon Sponge Gravel. 15. In- 

 terior of the dorsal or socket valve. 



25. ,, Robertoni, D'Archiac. Ibid. 



20. „ tamarindus, Sow. Lower Green Sand, near Sandgate. 



27, 28. ,, „ Parringdon Sponge Sand and Gravel (rare): 



20 to 31. „ ,, Different shapes, from the Isle of Wight. 



32 to 34. Waldheimia Celtica. Morris. Different ages, from the Lower Green Sand, 



Isle of Wight. 



35. „ ,, Interior of the dorsal or socket valve. 



36. Terebratula Tornacensis ? Farringdon. 



37. „ biplicata, Brocchi. Parringdon. 



38. ,. ? Parringdon; only two or three dorsal valves 



have been found. 



39. „ ? perhaps, a var. of T. sella, from the Lower Green 



Sand, Maidstone. 



40. „ biplicata? from the highest bed of Lower Green Sand, Polkstone. 



Note. — Figs. 36, 38, 39, and 40, are doubtful forms ; the want of sufficient material 

 has prevented more positive identification. 



