590 
PLATE LXIZ. 
—15. ORACANTHUS MILLERI, Agass, 
. Central dorsal bone of cranium. 
bo — 
. Upper portion of similar plate represented by figure 1. 
3. Jugular plate? or sphenoid bone. 
4, Upper jaw? 
5. Head bone. 
6. Cheek plate or operculuin ? 
7. Lower jaw. 
8, 10, 11. Bones forming part of the dermal covering of the head. 
9. Head bone of Oracanthus (Platycanthus isosceles of M‘Coy). 
12. Jugular plate? 
13. A peculiar squarely formed bone. 
14, 15, Small head bones. (Coccosteus and Asterolepis of M‘Coy.) 
Mountain Limestone, Armagh, : Ex coll. Enniskillen Collection. 
Page 
525 
