EXPLANATION OF PLATES. 109 



PLATE Vll. 



CONOCEPHALITES SHUMARDI. 



Fig. 1. A head, natural size. 

 ♦< 2. A pj'gidium, natural size. 



GONOCEPHALITES NASUTUS. / ^~ ^ jp| 



Fio. 3. A small head, natural size. ' ' \ 



«* 4. A larger head. 

 «« 5. A very conical glabella. 



«« 6 & 7. Two forms of cheeks, associated with the heads. 

 «' 8. A pygidiuni enlarged three diameters. 

 " 9. A pygidium enlarged two diameters, with two nodes on the terminal segment. 



The figures 8 and 9 represent two pygidia found associated with the heads of Con'^ 

 cephalites nasutus. It is impossible at this time to determine which of them belong 

 to the heads described. 



CONOCEPHALITES ERYON. 



Fig. 10. A head, natural size. 



•* 11. Impression of a cheek. 



*« 12. A thoracic segment, in outline, occurring on the same stone with figures 10, 

 11 & 16. 



«« 13, 14, 15. Thoracic segments from different parts of -the body. From Lacrosse, 



«< 16. A pygidium. From Trempaleau. 



CONOCEPHALITES PEKSEUS. 



Fig. 17. A small specimen twice enlarged. From Kickapoo. 

 «< 18. A head, natural size; a shorter form, from Root river. 

 «< 19. Profile of the same. 



<« 20 & 21. Two forms of cheek, associated in the same rock. 

 ** 22. Part of a thoracic segment. 

 «« 23. A pygidium, natural size 



CONOCEPHALITES EOS. 



Fig. 24. A head of this species. 

 <* 25. An imperfect thoracic segment. 



CONOCEPHALITES WINONA. 

 Figs. 26, 27 & 28 . A head, cheek and. pygidium, enlarged three diameters. 



CONOCEPHALITES lOWENSIS, 



Fig. 29. A small head -. from Trempaleau. 

 «« 30. A larger head : from Black river. 

 «« 31. A large head : from Root river. 

 «< 32. Parts of thoracic segments. 



«« 33. A pygidium partly restored, showing the peculiar furrows iu the rib.s of the 

 lateral lobes : from Black river. 



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