DESCRIPTION OF THE PLATES. 
PLATE IV. 
Fig. 1. Clavatcd spines of an echinus attached to the shell, imbedded in chalk. 
2. A long spine of the species Cucumerina, attached to a mammillated echinite. 
3. Cylindrical denticulated spines, with the shell in chalk. 
4. A fossil echinital spine, resembling a belemnite. 
5. A fossil spine, named Bacolo di Santa Paulo by Scilla. 
6. A knobbed cucumerine spine. 
7. A cast of Echinanthus altus from Malta. 
8. A cucumerine spine. 
9. An echinital spine of the species glandaria. 
10. A cordated echinite from Verona. 
11. An echinital spine of the species glandaria, formerly called petrified Olives. 
12. A curious flat serrated spine from Verona. 
13. A sulcated fossil from Shepey, apparently an echinital spine. 
14. An echinital spine of an uncommon character, bearing a resemblance to the belemnite. 
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> Varieties of the cucumerine species. 
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19. A fossil spine, in chalk, possessing the structure of a belemnite. 
20. A mammillated echinite from Wiltshire. 
21. Clavated spines attached to the shell, imbedded in flint. 
PLATE V. 
Fig. 1. A fossil cone from Verona. 
2. A minute silicious rostellarite from Devonshire. 
3 Part of an uncommon fossil shell, supposed to resemble a patella in some of its 
characters. 
4. Auricula ringens, completely silicious. 
5. Chiton octovalvis, with magnified figures of adherent serpulae. 
