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PLATE VIII. 
PlIACOPS KANA. 
See Plates 6, 7, 8 a, and 25. 
1. A young individual, enrolled and showing two pairs of latei-al furrows upon the glabella. 
2. Profile view of the same. 
3. Front view of the same. 
Hamilton group. Moscow, Livingston, county. 
4. Profile view of a small cephalon, showing’ normal pro2:)ortions. 
5. Dorsal view of the same, showing the glabellar fui'rows. 
6. An eye of the same enlarged. 
Hamilton group. Eiglitem-mile Creek, Erie county. 
7. A young, enrolled inclividual, showing the glabellar lurrows. 
Hamilton group. EigMetn-mile creek, Erie county. 
8. Profile view of an enrolled, slightly crushed specimen. 
9. Dorsal view of the same. 
Hamilton group. Wklder, Province of Ontario. 
10. A larger, enrolled individual. 
Hamilton group. Canandaigua Lake. 
11. A nearly entire, young individual. 
Hamilton group. Darien, Genesee county. 
12. The eye of a small individual, enlarged to three diameters, showing more numerous lenses than 
in advanced stages of growth. 
Hamilton group. Eighteen-mile Creek, Erie county. 
13. The eye of a larger individual, showing fewer lenses (similarly enlarged). 
Hamilton grouji. Geneseo, Livingston county. 
14. The eye of a slightly weathered specimen, showing the cavities left by the removal of the lenses 
(similarly enlarged). ■ ,,, 
Hamilton group. Near Geneva, O?itario county. 
15. An obliquely compressed and distorted specimen, showing- a common mode of occurrence. 
Hamilton group. Carmndaigua Lake. 
16. A large, entire cephalon. 
17. Profi'e view of the same. 
Hamilton group. Canandaigua Lake. 
18. A fragment of the under side of the cephalon, showing a portion of the hypostoma in place. 
Hamilton group. Jaycox's Run, near Geneseo, Livmg.ston county. 
Phacops Cacapona. 
Page 27. 
19. Dorsal view of a somewhat worn internal cast in chert. 
Hamilton group. Mouth of the Cacayon river, Virginia. 
20. Profile of another example, similarly preserved. 
21. Dorsal view of the same. 
Hamilton group. Mouth of the Cacapon river, Virginia. 
22. Front view of an enrolled sj)ecimen, refei'red with some hesitation to this species. 
23. Dorsal view of the same. 
24. Profile view of the same. 
Hamilton group. Locality doubtful. 
