164 



Pr^TE VI. 



Page 



liatostoma prosscri uov 151 



1. Longitudinal section, sliowinc sliallnw mature region, x 18. 



Lower Liberty, 

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

 Ic. Typical longitudinal section, x IS. Tipper Waynesville. 

 Id. Ix)ngitudinal section, sliowiiig (lee|) mature region, x 18. 

 Tapper Waynesville. 



