Recent and Fossil Foraminifera. 307 



sands of the west shore of the Bill lending themselves with 

 peculiar adaptability as the resting place of the shells between 

 high- and low-water marks. In addition to this we have to bear 

 in mind that the peninsula, which is formed of brick-earth and 

 glacial drift of varying thicknesses, resting upon the western 

 extremity of the old raised beach which extends from Brighton 

 to Havant,* is bedded upon and entirely surrounded by clay reefs 

 (" clibs " as they are locally called) of Lower Eocene date. These 

 are the celebrated Bracklesham beds which extend in a circle, 

 almost like the outer reef of a coral island, from West Wittering 

 and Chichester Harbour on the west, to Pagham on the east, and 

 the various bands of these beds, known as they are by their 

 characteristic fossils as, for instance, the Turritella bed, the 

 Nummulite bed, the Cardita bed, the Myliobatis (or Palate) bed 

 and so on, are seen to dip below the peninsula, and to make their 

 reappearance in their regular order upon the other side. Beyond 

 Pagham comes the whole range of the London Clay beds (upon 

 which the Brackleshain beds rest), cropping out upon the shore as the 

 Barn Bocks, and the Bognor Bocks. Beyond Bognor again the 

 Upper Chalk appears on the shore. Thus we have, added to the 

 usual littoral species of Foraminifera, a vast number of fossil 

 species derived from the Bracklesham Beds and the London Clay, 

 of the neighbourhood, whilst the travelling shingle, bringing with 

 it eastward the flints of the Upper Chalk, smashes a due propor- 

 tion of them, containing cavities once occupied by Siphonia and 

 other sponges, but now filled with the casts of Chalk Foraminifera, 

 which disperse upon our shore-sands, and join in the extremely 

 mixed bathing which is enjoyed by the Bhizopodal fauna of our 

 singularly favoured peninsula. 



In the Catalogue of Foraminifera which mainlv constitutes 

 this and the succeeding papers of our series, little or no attempt is 

 made to describe the particular species from any particular gathering 

 at any precisely noted spot upon the shores of Selsey Bill. This 

 is for two or three reasons ; first, that the main body of shells 

 described came from a large mixed gathering of 1000 c.c. taken 

 during a series of walks of two and a half miles from the extreme 

 point of the Bill, eastwards, up to Thorney Farm in Bracklesham 

 Bay ; second, that for ordinary purposes of study this may fairly 

 be taken to be one locality ; and, third, it was not until we began 

 seriously to search for the source of origin of the genus Cyclo- 

 loculina that we began to make strictly localised gatherings at 

 distances from about a quarter to half a mile apart round the 

 peninsula. When, therefore, in the notes that accompany the 

 catalogue of species, no precise locality is mentioned, it may be 

 taken to have been picked out of the 1000 c.c. above referred to. 

 A certain number of the fossil forms now described will be found 



* Bibliography (1908), p. 542, No. II. 



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