EXPLANATION OF THE PLATES. 317 



Fig. 7. Siliceous casts of cells formed in the shell of an Inoceramus by some parasitical 

 animal, p. 218. 



Fig. 8. Inoceramus Brongniarti, p. 214. 



Fig. 9. , the species not determined, p. 217. 



Fig, 10. latus, p. 216. 



Fig. 11. Cripsii, p. 133. 



TABLET XXVIII. 



Fig. 1. Inoceramus Cuvieri, p. 213. 



Fig. 2. mytilloides, p. 215. 



Fig. 3. , probably a variety of I. Brongniarti, p. 214. 



Fig. 4. Upper and under valve of I. Cuvieri, p. 213. 



TABLET XXIX. 



Remains of various species of Crustacea. 

 Figs. 1, 4. Chelate hand-claw of Astacus Leachii, p. 221. 

 Fig. 2. Cast of the thorax of a species of Cancer, p. 223. 

 Fig. 3, Chelate hand-claw of a species of Cancer, p. 223. 



Fig. 5. A block of chalk, containing part of a claw, leg, and several detached spines, of 

 Astacus Leachii; in the upper part of this specimen the remains of a fish are imbedded, p. 222. 

 Fig. 6. The tongue of Amia Lewesie7isis, p. 241. 



The following are from the Blue chalk marl, near Lewes. 

 Figs. 7, 8, 14. A species of Cancer allied to the genus arcania, p. 96. 

 Figs. 9, 10. A species belonging to the family Corystidce, p. 97. 

 Figs. 11, 12. A species o? Etyiis, p. 97. 

 Figs. 13, 15, 16. Species o{ Con/sfes, p. 97. 



TABLET XXX. 



Fig. 1. The tail and part of the abdomen of Astacus Leachii, p. 222. 



Fig. 2. The two chelate hand-claws of A. Leachii, p. 221. 



Fig. 3. The chelate hand-claw of an unknown species of Astacus, p. 223. 



TABLET XXXI. 



Fig. 1. On the left of this specimen is a portion of the thorax of Astacus Leachii, and on 

 the right, a claw deprived of one of its pincers, p. 222. 

 Fig. 2. Cast of the thorax of A. Leachii, p. 223. 

 Fig. 3. The thorax of the same, flattened by compression. 

 Fig. 4. The most perfect specimen of Astacus Leachii hitherto discovered. 



