PLATE VI—Continued. 
Fig-. 26. A frag-ment of a cephalon, showing- the hypostoma in place. 
Schohai-ie grit. Schoharie, Schoharie comity. 
Fig. 27. A cast of the lower surface of a pygidium, showing traces of the grooves upon the pleural annu- 
lations. 
Schoharie grit. Near Clarksville, Albany county. 
Fig. 28. A cast of a larger pygidium, showing the simple pleural annulations ; their usual appearance in 
an impression of the lower surface. 
Upper Helderberg- limestone. Schultz's farm, near Clarence, Hh-ie county. 
Fig. 29. A very large pygidium in the same condition of preservation. 
Schoharie grit. Schoharie, Schoharie county. 
Phacops rana ? 
Fig. 14. Dorsal view of a specimen retaining the parts in juxtaposition. The head is slightly displaced 
and somewhat impei-fect. 
Fig. 15. Profile of the same, sho-wing the elevation of the body. 
Upper Helderberg limestone. Ohio. 
