546 



THE DEVONIAN PERIOD. 



The leaves of the present species are very abundant in the shales 

 of the vicinity of St John, and indeed are eminently character- 

 istic of them ; and on this account I regard the dedication of it to 

 my late lamented friend, Dr Robb, as specially appropriate. I have 



Fig. 191. — Cyclopteris Jacksoni. 



(a and b), Pinnules showing venation. 



not recognised this plant in the specimens from Gaspe or Perry; 

 and the only indication of it in the New York collection is a frag- 

 ment of a leaf from the Hamilton group of Cazenovia, New York, 

 not sufficiently perfect to render its identification certain. 



Cordaites angustifolia, Dawson. Leaves linear, much elongated, 

 one-tenth to one-fourth of an inch broad, with delicate, equal, parallel 



