EXPLANATION OF THE PLATES. 



Figs. 7 & 8. Pericarpium of C. tuberculata, a new species of Gyrogonite discovered in 

 the lower freshwater formation at White-cliff Bay, Isle of Wight. The spiral 

 valves form constantly nine rings. — For a description of this, and of the strata in 

 which it occurs, see p. 94. 



PLATES XIV. & XV. 



Illustrate Mr. Murchison's paper on the Geology of a part of Sussex, Hants, and 



Surrey. Art. IX. p. 97. 



Plate XIV. 



Geological map of the north-western part of Sussex, and the adjoining parts of Hants 

 and Surrey; reduced from the Ordnance Map ; with a section. 



Plate XV. 

 Bones of saurian animals from the Iron-sand. 

 Figs. 1 to 7, from the N.E. of Loxwood : see pp. 104, 105. 

 Figs. 8 and 9, from Headfoldwood-common. 



Fig, 1. A caudal vertebra, 



2. A lumbar vertebra. 



3. One of the^rs^ caudal vertebrae. 



4. Sacrum. 



5. Portion of a rib. 



6. Two caudal vertebrae anchylosed together. 



7. False rib ; or branch of the os hyoides. 



8. Vertebra found with the great femur. 



9. The great femur : see p. 104. 



PLATE XVI. 



Detailed sections of the chalk, and sands beneath the chalk, on the coasts of Dorset 



and Devon, in illustration of a paper by H. T. De la Beche, Esq. Art. X. p. 109. 

 Fig. 1. Section to the west of Lyme Regis, Dorset : vide pp. 110 — 115. 

 Fig. 2. Section at White-cliff, to the east of Beer, Devon : vide pp. 115, 116. 



Fig. 3. The same as Fig. 2, with some variation in the sands immediately below the 

 chalk. 



Fig. 4. Section, showing the position of the Beer-stone in Branscombe-clifFs, to the 

 west of Beer-head : vide pp. 116, 117. 



PLATE XVII. 



Map of the vales of Kingsclere and Ham, to the south of Newbury, and section across 

 the vale of Kingsclere ; in illustration of a paper by the Rev. Dr. Buckland on the 

 Formation of Valleys, &c. Art. XI. p. 119. 



