236 MESOZOIC AND CAINOZOIC DINOFLAGELL ATE CYSTS 



publication of the relevant parts of this paper ; Professor H. L. Hawkins for making 

 the Enborne Borehole cores available, and Sir James Stubblefield of H.M. Geological 

 Survey, for permitting study of chalk specimens from the Fetcham Mill Borehole, and 

 for permitting publication of the relevant parts of the paper. 



Finally, the assistance of Mrs. P. E. Lunn, Miss Eileen Bruce and Miss Denise 

 Hales in the preparation of the manuscript, and of Mr. J. Eyett in photography, is 

 gratefully acknowledged. 



The work of two of the authors (R.J.D. and G.L.W.) was done under the tenure of 

 D.S.I.R. research studentships. 



