FIG. 74 
75 
“ - 
as on ¢ 
thet deteiedl a 
Figs. 74-79. — Pteraspis (restored). 4. (After LANKESTER.) Lower Old Red 
‘Sandstone, Herefordshire. 75. Paleaspis americana, Claypole. X 3. (Restoration after 
CLAYPOLE, somewhat modified by the writer.) 76. Pteraspis, dorsal shield, slightly 
restored, (After LANKESTER.) 77. Pteraspis, ventral shield (‘‘ Scaphaspis"), showing 
mucous canals. (After SMITH WOODWARD.) 78. Cephalaspis lyelli, side view. (Re- 
stored by LANKESTER.) 79. Cephalaspis lyelli, dorsal aspect. X }. (After L. AGASSIZ.) 
Specimen from Old Red Sandstone, Forfarshire. A C. Rhomboidal scales from different 
body regions. 2. Tessera from middle layer of head shield. 
66 
