EXPLANATION OF THE PLATE. 



Figure 1. Trimerus Delphinocephalus. 



2. Calymene Diops. 



3. Asaphus Micrurus. 



4. Cryptolithus Tessellatus. 



5. Paradoxides Boltoni. 



6. Triarthrus Beckii. 



7. Isotelus Cyclops. 



8. Dipleura Dekayi. 



9. Head of D. Dekayi. 



10. Ceraurus Pleurexanthemus. 



The above figures represented on the Frontispiece to this 

 volume, were first published in the Monthly Journal of Geo- 

 logy, &c. for June, 1832, and I am indebted to C. A. Poulson ? 

 Esq., for the use of them in this Monograph. 



