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-distincte de celle du pygidium. 



Families, l^'"^ Serie. Plevre a sillon. 



iiL<: 



IV 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8*. 



9* 



10*'. 



rlk 



13. 

 14*. 

 15. 

 16. 



L17*. 

 rl8. 

 •Il9. 



A 



VI. 



r20. 



121*. 

 VII. 22. 

 f23. 

 VIII. ^24. 



[25. 

 r26. 

 IX. \ 27*. 



128*. 



Harpes 



Remopleurides , 

 Paradoxides ... 

 Hydrocephalus . 



Sao 



Arionellus 



Ellipsocephalus 



Olenus 



Peltura 



Triarthrus 



Conocephalites 



Prcetus 



Pliillipsia 



Griffithides . . . 



Cyphaspis 



Arethusina 



Harpides 



Phacops 



Dalmania 



Calymene 



Homalonotus . 



Lichas , 



Trinucleus 



Arapyx ........ 



Dionide 



Asaphus 



Symphysurus.., 

 Ogygia 



Axe tronque. 

 X. 29. iEglina 



Gold/. 



Portl. 



Brong. 



Barr. 



Barr. 



Barr. 



Zenk. 



Dalm. 



M.Edw. 



Green. 



Zenk. 



Stein. 



Portl. 



Portl. 



Burnt. 



Barr. 



Beyr. 



Emmr. 



Emmr. 



Brong. 



Kon. 



Dalm. 



Lhwyd. 



Dalm. 



Barr. 



Brong. 



Gold/. 



Brong. 



Barr. 



Families. 2"^^ Serie. Plevre a bourrelet. 

 XII. 32. Acidaspis Murch. 



u 



.is 

 s 



B< 



r33. Cheirurus Beyr. 



1 34. Placoparia Cord. 



XIII. <^ 35. Sphaerexochus . Beyr. 



\ 36. Staurocephalus Barr. 



[37 . Deiphon Barr. 



XIV /^^*- Zethus Pand. 



•\39. Dindymene ...Cord. 



r40*. Amphion Pand. 



XV. "141*. Encrinurus . . . Emm r. 



L 42. Cromus Barr. 



XI 



Groupe de passage. 



/ 30. Illajnus Dalm. 



131*. Niteus Dalm. 



.§1 



S.S 



B x< 



•2 u 



hi O 



Axe tronque. 

 XVI. 43. Bronteus Gold/. 



44. Telephus ... 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, 



