Ixviii. PRESIDENT'S ADDRESS. 



according to latitude, the nature of the sea-bed, and other causes. 

 There is an evident relationship of our existing marine fauna with 

 that of the early Pliocene (Coralline Crag of Norfolk and Suffolk). 

 Out of about 340 species of testaceous molluscs, 73 are DO\V living 

 in the British seas ; the rest are either extinct or their most 

 northern range is south of Britain. In the Red Crag there are 260 

 species of testacea, of which 60 are known to be living in the 

 British seas, which is a larger proportion than those in the 

 Coralline. 



I will now draw your attention to the papers of Mr. Jukes- 

 Browne, of Mr. Clement Reid, of Mr. A. Smith Woodward, and of 

 Mr. Bullen Newton, which were read at our last winter meetings, 

 all of which relate to the county of Dorset. We shall have 

 another of Mr. Jukes-Browne's papers at our Pillesden meeting 

 next month, in which he clearly shows that the Cretaceous 

 beds were spread over the whole district from Bridport to Bere 

 Head in Devonshire. The exposed Jurassic beds have an easterly 

 tilt, and are broken by many faults which occurred before they 

 were overlaid by the Greensand. During the later Tertiary 

 times the beds were lifted dome-like, occasioning a dip outwards 

 in all directions. The centre of this uplift was probably at the 

 intersection of two lines, the one from Lambert's Castle and 

 Drakenorth Hill, the other from Lewesdon and Eype Down. The 

 author thinks that the watershed of this part of Dorsetshire has 

 considerably changed, and that the streams cut for themselves 

 channels through the Chalk and Greensand, reaching the sea far 

 southwards, when the English Channel was dry land, and, like 

 the other local streams, were tributaries of a large river, traces of 

 which are apparent in the Isle of Purbeck. The rivers which now 

 drain the district are the Char and the Simene, which pass to the 

 sea through the southern hills. 



One of the most important contributions to the history of the 

 Blashenwell deposit is the discovery of implements by Mr. Clement 

 Reid. Among the many flint-flakes scattered throughout the tufa 

 no implement of any kind showing the slightest sign of secondary 



