FIG. 74 



75 



".^ 





,^^;i}y 



Figs. 74-79. — Pteraspis {resioxtd). X 2. (After Lankester.) Lower Old Red 



Sandstone, Herefordshire. 75. Palceaspis aniericaiia, Claypole. X 4. (Restoration after 

 Claypole, somewhat modified by the writer.) 76, Pteraspis, dorsal shield, slightly 

 restored. (After LANKESTER.) j^. Pteraspis, ventral shield i^' Scaphaspis") , showing 

 mucous canals. (After Smith Woodward.) 78. Cephalaspis lyelli, side view. (Re- 

 stored by Lankester.) 79. Cephalaspis lyelli, dorsal aspect, X 5. (After L. AGASSI Z.) 

 Specimen from Old Red Sandstone, Forfarshire. A C. Rhomboidal scales from different 

 body regions. B. Tessera from middle layer of head shield. 



66 



i 



