299 



Port Reostan, Feet high. 



6. Chimney Tops, summit, 380 



Port na Spania. 



7. Ben an ouran, 392 



Port na Callian. 



8. Headland, .373 



Port na Tober. 



9. Plaiskin Head, 395 



Port Plaiskin. 



10. Benbane, ) ( 332 



11. Headland, Port na Truin, . . ] 345 



12. Bengore Head, ) (367 



Portfad. 



13. Contham Head, 259 



Port Moon. 



14. At Island, top of Cliff, 117 



15. Dunseverick-on- the- Shore, . . . . . .142 



1 6. Templestragh, 87 



Whiteparlc Bay. 



17. Ballintoy, Flagstaff, .139 



Boheeshane Bay. 



18. Larry Bane Head, . . . . . . 168 



Larry Bane Bay. 



19. Carrickarede, . .290 



Portmore. 



20. Kenbane Head, ........ 220 



Ballycastle Bay. 



21. Croaghateemore, two miles east of Ballycastle, . . 433 



22. Fair Head, four miles east of Ballycastle, . . 636 



The word trap, in the sense in which I use it, includes a great num- 

 ber of rocks of analogous chemical composition, containing the same 

 bases and silica, and only slightly differing in their relative propor- 

 tions. The same rock, too, may exhibit great diversity in aggregation, 

 being soft, hard, compact, crystalline, vesicular, without much variation 

 in composition. Geologists have been more or less successful in provid- 

 ing names for all these varieties. 



In the following observations, however, I deem it advisable to 

 avoid a voluminous, and perhaps embarrassing nomenclature, got from 



