EXPLANATION OF THE PLATES. 311 



Figs. 4. 5. 7. 8. 11. Supposed aments or cones of a species of Larch, from Hamsey; 

 p. 103. 



TABLET X. 



Flints of various shapes, deriving their forms from Ventriculites radiatm, p. 170. 



TABLET XL 



Two specimens of Ventriculites radiatus, in which the lower part of the funnel-like cavity 

 is filled with flint; the upper portion being expanded on the chalk, p. 171. 



TABLET XII. 



Fig. 1. Ann I'ar flint formed in a Ventriculite, p. 172. 



Fig. 2. A Ventriculite in chalk, exhibiting the external surface, and the ramifications of 

 the radical processes, p. 172. 



TABLET XIII. 



Fig. 1. A flint deriving its form from Ventriculites radiatus, p. 173. 



Figs. 2. 3. 5. Chalk specimens of the stirps, or inferior part of VentricuUtes radiatus, 

 p. 173. 



Fig. 4. A Ventriculite with the inferior portion enclosed in flint, and the upper part 

 exposed on the chalk, p. 173. 



Fig. 6. Magnified representation of part of the external integument of fig. 2. 



TABLET XIV. 



Specimens of VentricuUtes radiatus expanded on the chalk, p. 173. 

 Fig. 1. The internal surface studded with numerous perforated papilla. 

 Fig. 2. The external surface. 



TABLET XV. 



Fig. 1. C^aoamtes Jlexuosus, p. 179- 



Fig. 2. subrotundus, p. 179- 



Fig. 3. Ventriculites Benettice, p. 177. 



Fig. 4. Section of a fossil zoophyte related to the Alcyonia, p. 162. 



Fig. 5. Turbinated alcyonite, p. 161. 



Fig. 6. Ventriculites quadrangidaris, p. 177. 



Fig. 7. Spongus labyrinthicus, p. 165. 



Fig. 8. Sihceous cast of a branched coral, from the centre of a flint, p. 163. 



