33G GEOLOGY OF BUTE. 



Cirripoda, 



Balanus creiiatus, 



porcatus, . . . . 



Verruca stromia, .... Miill. 



Annelida. 

 Serpula verruicularis, .... Lin. 



Echinodermata. 



Echinus sphsvra, plates and spines, 



drobachiensis, . . . Miill. 



Striated Rocks. 



143. Striated and polished rocks, striated boulders, and 

 roches moutonnees are plentifully met with in Bute ; the whole 

 contour, indeed, of the surface in all its three divisions clearly 

 points to ice action as having moulded the outlines. Perhaps 

 one of the most perfect specimens of striation and rounding to 

 be met with in Scotland occurs on the high ground W. of 

 Rothesay. The slate and quartz rock on and in the neighbour- 

 hood of Barone Hill, 520 feet in height, have been smoothed, 

 polished, and striated in the most i-emarkable way by a force 

 acting from the north up tli& slope on that side and down on the 

 other, the nigged prominences of the strata which rise toward 

 the north being worn off, while the surfaces directed the 

 opposite way retain their original outlines. Mr. Geikie 

 (Tr. GeoL Soc. GL, L 23) gives another striking example, 

 not visited by us, on the shore of Loch Dhu; and the round- 

 ing and polishing on the N. end of the island and in the 

 Kyles generally can hardly have escaped the notice of any 

 one who has made the passage of that lovely strait on a 

 bright day. Mr. MacBride, by whom most parts of the 

 island have been carefully examined, with a view to the 

 evidences of glacial action, considers that the abrading agent 

 cume from the N., and from without the island, and passing 

 steadily over every part in one uniform direction, save with 



