Descriptions of the coast-section between Highcliff and Bourne-mouth, with which the present paper deals, have already appeared in the publications of the Society. That by Sir Charles Lyell, in 1826, was written when the strata included in this section were still supposed to belong to the Plastic Clay underlying the London Clay. In it the different beds forming Christchurch Head are carefully distinguished, and their superposition illustrated in a somewhat idealized section. The description of the eight miles of cliff from a mile beyond White Pits to Poole Harbour is, however, dismissed in a very few words:—The “section presented by the cliffs is continued so precisely in the line of bearing of the strata, that no new beds rise up, and it is unnecessary to describe them in detail..... The prevailing character of the strata throughout this extent of coast is line white sand; but yellowish and pinkish beds of sand occur, and thinly laminated clays in great abundance, resembling in appearance many of the light-coloured argillaceous marls of Montmartre near Paris; but in none could I discover any organic remains, except vegetable impressions, and these very indistinct.” The proofs of origin, whether marine or freshwater, are considered equivocal. The total thickness of the series, nowhere exposed to view, is put down at “not less than 150 feet.” It is also suggested that the argillaceous strata with shells of Alum Bay “are probably concealed here at some of the interruptions of the section.”