ha. 
Trans. KR. S. C., 1886. DEVONIAN FISHES, 
R L. M. LAMBE, DEL. 
fs 

Sec. IV. Plate VII. 

PTERICHTHYS (BOUTHRIOLEFIS) CANADENSIS, Whitsavas. 
Fic. 1.—Under surface to show the shape and arrangement of the plates. 
Fic. 2,—-End view of the combined dorsal and ventral body shields in outline as seen from behind. 
represents the tail opening. 
The inner continuous line 
