FIG. 74 



75 



Figs. 74-79. — PUraspis (restored). X 5. (After Lankester.) Lower Old Red 

 Sandstone, Herefordshire, y^. Palceaspis americana, C\a.ypo[e. X «. (Restoration after 

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

 restored. (After LANKESTER.) 77. Pteraspis, ventral shield (" Scaphuspis ") , showing 

 mucous canals. (After SMITH WOODWARD.) 78. Cephalaspis fyelli, side view. (Re- 

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

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

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



66 



I 



