﻿Quart. Journ. Geol. Soc Vol. LXIV, Pl. XXXIV. 

 Fig. 1. X 18 DiAMS. 



Fig. 2. x is diams. 



T. C. Hall, Photomicro. Bonrosc, Co/io., Derby, 



PHYLLITES FROM COLONSAY. 



