466 G. Dowker—On the Chalk of Kent 



14. Argiope ? Rovasendina (Dav.), Lower Miocene or Oligocene, Monte 



Sgreve di Sant Urbano. Mus. School of Mines, Paris. 14 a, b, c, d, 

 enlarged. 



15. Platidia (Morrisia), anomioides (Scacchi), Lower Pliocene, near Messina. 



15a enlarged. 



16. Platidia (Morrisia) JDavidsoni (Deslongchamps), Quaternary, Trapani, 



Sicily.; after Seqiienza. 

 17-19. Thecidium Mediterraneum (Eisso). 17. Lower Miocene or Oligocene, 

 Monti Grumi di Castel Goberto. Mms. School of Mines, Paris. 17 a, b, 

 enlarged. 18, 19, from Middle Miocene, near Turin, coll. of Sig. 

 Eovasenda. 



20. Crania Bayaniana (Dav.), Eocene? Bucca di Sciesa, near Brendola. 



20 a, b, enlarged. Mus. E'cole des Mines, Paris. 



21. Crania Bayaniana? 'Eoceae, GrQSdt.ra. Same collection. 



22-27. Crania abnormis (Def.) 22. Attached valve. Middle Miocene, Sciolze. 

 22a enlarged ; 23, exterior of same specimen, natural size ; 24, interior 

 of upper valve, Middle Miocene, Hill of Turin. 24«. enlarged; 25, 

 exterior of same valve ; 26, 27, exterior and interior of an attached 

 valve, from Terrenegre, near Bordeaux. 



28-29. Crania lamellosa (Sequeuza), Pliocene, near Messina. Enlarged. 



III. — On the Chalk of Thanet, Kent, and its Connection with 

 THE Chalk of East Kent.^ 

 By George Dowkee, F.G.S. 

 rilHE Chalk from Cop-point, near Folkestone, to Walmer in Kent, 

 X lias been so well described by Mr. W. Phillips, that I need do 

 little more than allude to his paper,^ in reference to the divisions of 

 the Chalk in East Kent ; but in a notice of the Isle of Thanet by 

 the Eev. W. D. Conyljeare,^ this gentleman, from the absence of 

 flints in the Chalk near Margate, was led erroneously to suppose it 

 to belong to the lower division, and it was not till 1865 that 

 this error was exposed in a paper on the Chalk of the Isle of 

 Thanet by Mr. W. Whitaker, E.aS., of the Geological Survey,* the 

 latter gentleman pointed out the true position of the Margate Chalk, as 

 that of thehighest Chalk, and superior to that with numerous flints seen 

 at Eamsgate ; and he there remarked, " Very likely the Broadstairs 

 Chalk will turn out to be the upper part of the ' Chalk with many 

 Flints ' (Phillips) of the cliffs from Walmer Castle to Dover Castle, 

 and which is there the highest division ; ^ so that the Isle of Thanet 

 section would be the upward continuation of that given by Mr. 

 Phillips." 



Having in 1866 examined with Mr. Whitaker the coast-sections of 

 the Isle of Thanet, and since that time made various com- 

 parisons of the Chalk of Thanet and surrounding neighbourhood, 

 and having collected many fossils from the Margate Chalk, as well as 

 the uppermost divisions of the Chalk shown in pits at Word, Eastry, 

 Wingham, and Canterbury, it is my object in this paper to lay before 

 this Society the conclusions I have arrived at. 



1 Eead before the Geologists' Association, May 7, 1870. 



2 Geological Transactions, vol. iv., p. 437. 



» Geology of England and "Wales, by the Eev. W. D. Conybeare and "W. Phillips 

 (1822), p. 90. 

 * Journal of the Geological Society, 1865, p. 395. 

 5 The Geologist, 1863, p. 154. 



