202 EXPLANATION OF PLATES. 



CONOCEPHALITES SHUMARDI. ( FigS. 19 & 32.) 



Fia. 19. A movable clieek, referred with some hesitation to this species: from Marine 

 mills. 

 «< 32. Part of the glabella and fixed cheeks, restored in outline from other speci- 

 mens. This is the largest individual seen. 



CONOCEPHALITES WISCONSENSIS. ( 22 - 24, 27, 28.) 



Fig. 22. Glabella, frontal limb, and part of fixed cheeks; the glabella showing in- 

 distinct furrows. 

 «< 23. Profile of the same. 



*< 24. A pygidiuni associated with the preceding specimens. 

 «< 27. A smaller individual, not showing glabellar furrows. 

 «' 28. A profile of the same. 



CONOCEPHALITES HAMULUS. 



Fig. 25. The glabella, frontal limb, and part of fixed cheeks ; with a slender spine from 

 the occipital ring. 



«« 26. A profile of the same. 



CONOCEPHALITES ANATINUS. 

 Fig. 29. The glabella and fixed cheeks of a small individual, from Trerapaleau. 



CONOCEPHALITES PERSEUS. 



Fig. 83. Glabella and fixed cheeks of a small specimen from Kickapoo. The figure ia 



twice enlarged. 



Some of the figures on this plate, having been incorrectly traced in lithographing, 

 have been reproduced on Plate vii» 



