EXPLANATION OF PLATE VI. 



Fig. I. Monograptus Galaensis, Lapw. 



2. ,, M'Coyi, Lapw. 



3«. „ lobiferjus? M'Coy. Var. pandus (proximal extremity); 

 2>b, distal extremity ; 3<r, the same enlarged. 



4. Cephalograptus cometa, Geinitz. 



5. Dimorphograptus Swanstoni, Lapw. 



6. ,, elongatus, Lapw. 



7. Diplograptics acuminatus, Nich. 



8. ,, confertus, Nich. 



9. ,, sinuatus, Nich. 

 10. ,, tticoriiis, Carr. 

 lla. „ angustifolius, Hall, lib, portion enlarged. 



12. ,, tamariscus, Nich. 



13. ,, dentatus, Brogn. 



14. ,, Hughesii, Nich. 



15. ,, insectiformis, Nich. 



16. ,, folium, His. 

 17^. „ truncatus, Lapw. \*]b, portion enlarged. 



18. ,, foliaceus, Murch. 



19. ,, vesiculosus, Nich. 



20. ,, quadtimucronatus, Hall. 



21. „ Whitfieldi, Hall. 



22. „ mucronatus, Hall. 



23. ,, bimucronatus, Nich. 

 24a. Glossograptus Hincksi, Hopk. (Ventral aspect); 24^, lateral aspect. 



25. Lasiograptus margaritaius, Lapw. x. 2. 



26. ,, Harknessi, Nich. x. 2. 



27. Clathrograptus cuneifor?nis, Lapw. x. 2. 



28. Retiolites fibratus, Lapw. x. 2. 



29. ,, perlatus ? Nich. Var, obesus, Lapw. x. 2. 



30. ,, „ Var. Daironi, Lapw. x. 2. 



