Miscellaneous. 



229 



opinion which Professor Edward Forbes entertains of this work of 

 M. Barrande was declared in the warmest terms by him in the pro- 

 ceedings of our Section. 



Your very obedient servant, 



Roderick I. Murchison. 

 Essai de Classification des Trilohites. 

 Section I. Conformation de la tete tres-distmcte de celle du pygidium. 



Families. P'^ Serie. Plevre a sillon. 



I. 

 II. 



III.^ 



1. 



2. 



3.' 



4. 



5. 



f). 



/• 



8*. 



9* 



10*! 

 ^11. 



ri2. 



j 13. 



16. 

 [\7*. 



VI P'^- 



VII. 22. 



[23. 

 VIII. ^ 24. 



[25. 

 26. 

 IXA 27*. 



28*. 



Families. 2'"« Serie. Plevre a bourrelet. 

 f XII. 32. Acidaspis Murch. 



3 r^ 





<; 



f~33. Cbeirurus Beyr. 



I 34. Placoparia Cord. 



XIII. -^ 35. Sphserexocbus . Beyr. 



I 36. Staurocepbalus Barr, 



[_o7. Deipbon Barr. 



XIV I'^^*- Zetbus Pand. 



"1.39. Dindymene ... Cord. 



r40*. Amphiou Pand. 



XV. -I 41*. Encrinurus ... Emmr. 



[42. Cromus Barr. 



Axe tronque. 

 X. 29. JEglina 



Barr. 



XI 



■{ 



Groupe de passage. 



30. Iltenus Dalm. 



31*. Niteus Dalm. 



is 



a 2 





XVI. 43. 



Axe tronque. 

 Bronteus Goldf. 



44. Telepbus ... Barr. (plevre inconnue). 



Section II. Conformation de la tete peu distincte de celle du pygidium. 

 XVII. 45. Agnostus Brong ? 



N**. les genres qui manquent en B. 



