164 



Plate VI. 



lUitostnma prosscri, hoy 1 •"• 1 



1. Longitudinal Hection, allowing sliallnw matiin' region, x IS. 



Lower Liberty, 

 la. and b. Two specimens natural size. Lower Liberty. 

 Ic. Ty])ieal longitudinal section, x IS. TTpper Waynesville. 

 Id. Longitudinal section, sliiiwiiig decii mature region, x IS. 



Upper "Waynesville. 



