506 Proceedings of the Royal Irish Academy. 



Trieste. (This triangular space takes in Switzerland and part of the 

 Tyrol.) 



The Ehine district, extending from the confines of Baden and 

 Switzerland to Holland in a direction nearly north and south, and 

 presenting about one hundred miles in breadth from west to east. 



The Saxony district, more circumscribed, but perfectly well 

 marked. 



Various districts in France, particularly the line of the Pyrenees. 

 -'Great Britain. 



The west coast of Portugal. 



The south-east coast of Spain. 



Sweden and I^orway. 



Outside Europe proper, and in connexion with the Mediterranean 

 nd Black Seas : — 



Asia Minor, especially the west coast and Sea of Marmora. 



The north coast of Africa. 



The Syrian coast. 



The line of the Caucasus. 



As explained in the memoir " On the Prismatic Forms of a Group 

 of Basalts," I traced on the globe sixty-seven coast-line great circles, 

 correlated by certain angular relations, and of these great circles the 

 following traverse Europe and the adjacent continents : — 



No. 



2. East Cape Madagascar. 



3. "West coast of Eead Sea. 



4. East coast of Red Sea. 



5. Coast of Syria. 



7. "West coast of Morocco. 

 12. Southern boundary of the tertiary formation of the United 



States. 

 13? East coast of South America. 



14. North coast of Africa. 



15. "West coast of Portugal. 



16. East coast of England. 



23. Caucasus great circle. 



24. South-east coast of Africa (Sofala coast). 

 28. Axis of Sumatra. 



32. North-east coast of Persian Gulf. 



50. Promontory of New Ulster. 



51. East coast of Sweden. 



53. East coast of New Zealand. 



52. "West coast of Sweden. 



66. South-west coast of Australia. 



