592 
PLATE LXIII. 
Page 
Fics, 1-4. ORACANTHUS MILLERI, Agass., ‘ ; ¢ 6 : 6 525 
» 1. Upper or anterior surface of dermal plate. 
», la, Lateral view of same specimen. 
» 10. Section near the apical extremity, showing the thickness of the bony part and 
large internal cavity. 
» 2. Sinistral example of specimen similar to figure 1. 
» 3. Dextral example of a similar specimen. 
Mountain Limestone, Armagh, 0 Ex coll. Enniskillen Collection. 
,», 4, Peculiarly shaped bone, forming some portion of the external covering of the fish, 
Mountain Limestone, Bristol, O Hex coll. Enniskillen Collection. 
Fic. 5. CHErRoDUS PEs-RANA Moy, 0 523 
», 9a. A magnified view of the same specimen. 
Mountain Limestone, Derbyshire, Hx coll. Woodwardian Museum, Cambrid ge. 
Fie. 6, Cotonopus Loneipeus, M‘Coy, . ; : : hy é 523 
Mountain Limestone, Armagh, Hx coll. Museum of Geol. Society, London. 
Fies. 7-12. External covering of Catacantuus,. Agass., . : 6 6 6 524 
Fic. 7. Under-surface of the operculum. 
,, 8. Upper-surface of the operculum. 
», 9. Dermal covering from head. 
,, 10. Jugular plate. 
,, 11. Head plate. 
», 12. Scale. 
Mountain Limestone, Armagh, 6 Ex coll, Enniskillen Collection. 
