British Association, 84th Report, Australia, 1914.} [Puate II, 
a? 
») 
Fie. 4.—Phyllolepis concentrica, Ag.; ventral or dorsal aspect of dermal armour, 
showing arrangement of plates, two-thirds natural size. 
Illustrating the Report on the Upper Old Red Sandstone of Dura Den. 
[To face page 122. 
