EXPLANATION OF THE PLATES. 



scale of horizontal distances is the same with that of the map ; but that of the 

 heights much greater. The colours denoting the rocks correspond with those of 

 the map. 

 Fig. 4. An undescribed Ammonite, from the blue clay of the oolite formation at the 

 Vaches Noires cliffs: pp. 77 and 78. — b. represents a portion of the edge. 



Fig. 5. A specimen of the Hallirrhiie costata of Lamouroux, showing the interior 

 structure ; from the green sand of the Vaches Noires cliffs : p. 73. 



Plate X. 



Sections of the coast of France, from Fecamp, in the department of the Seine Inferieure, 

 to Grand Camp, in the department of Calvados : p. 73. The scale is considerably 

 larger than that of the map, Plate XI. The colours indicating the rocks cor- 

 respond with those in the map. 



Plate XL 



Geological map of portions of the departments of the Seine Inferieure, the Eure, 

 Calvados, and La Manche. The colours correspond with those of the sections 

 Plates IX. and X. 



PLATE Xn. 



Illustrates Mr. Webster's paper on the Fresh-water Formation in Hordwell Cliff, 



&c. Article VII. p. 90. 

 Fig. 1. represents a section of the coast of Hampshire, from Hurst Castle toMuddi- 



ford. The scale of heights is greater than that of lengths. 



Fig. 2. A Map of the coast of which fig. 1. is a section, together with a small part of 

 the Isle of Wight. 



Fig. 3. represents the magnified appearance of some fossil bodies found in the fresh" 



water formation at Hordwell : pp. 92, 93. 

 Fig. 4. The same bodies of their natural size. 



PLATES XIIL & XIV. 



Illustrate the Rev. William Buckland's paper on the Excavation of Valleys, &c. 

 Art. VIII. p. 95. 



Plate XilL 



Map of the Valleys which intersect the coast of Dorset and Devon. — The N. W. angle, 

 not being mentioned in the paper, is not coloured. 



2 a2 



