XXV111 LIST OF PLATES. 



or in the Miocene or Eocene formations, but occurs both in the 

 Newer and Older Pliocene strata. Mitra plicatula has been 

 found only in the older Pliocene deposits. The Turbo rugosus 

 was considered as exclusively Pliocene when selected by M. 

 Deshayes, but M. Bone has since found it in the Miocene 

 strata at Vienna and Moravia (see Tables, Appendix I. p. 2G). 

 Buccinum semistriatum is also a Miocene shell,, but was in- 

 serted as being peculiarly abundant in the Pliocene strata. 



Plate II. All the shells figured in this plate, except Car- 

 clita Ajar, are very characteristic of the Miocene formations; 

 that is to say, they are found in that period and no other. 

 Cardita Ajar is also very common in the Miocene strata, but 

 is also a Recent species. It has not yet been observed in any 

 Pliocene deposit. 



Plate III. The species of shells figured in this plate are 

 characteristic of the Eocene period, as being exclusively con- 

 lined to deposits of that period, and for the most part abundant 

 in them. 



Plate IV. The microscopic shells of the order Cephalo- 

 poda, figured in this plate, are characteristic of the Eocene 

 period, and are distinct from the microscopic shells of the Older 

 Pliocene formations of Italy. The figures are from unpub- 

 lished drawings by M. Deshayes, who has selected some of the 

 most remarkable types of form. The reader will observe, that 

 the minute points, figures 4, 8, 11, 14, and 18, indicate the 

 natural size of the species which are represented. (For obser- 

 vations on these shells see p. 251.) 



Plate V. Geological Map of the south-cast of England, 

 exhibiting the Denudation of the Weald. This map has been 

 compiled in great part from Mr. Greenough's Geological Map 

 of England, and Mr. Mantell's Map of the south-east of 

 England. (Illustrations of Gcol. of Sussex, and fossils of 

 Tilgate Forest, 1 827.) The eastern extremity of the i denu- 

 dation ' is reduced from Mr. Murchison's Map of that district. 

 (Geol. Trans., 2nd series, vol. ii. part i. plate 14.) The object 

 of this map is fully explained in chapters xxi. and xxii. of this 

 volume. 



