PLATE I 



FIG. i. Block of Carboniferous Limestone containing Lithostrolion 



irregulare. Port St. Mary, Isle of Man. 

 FIG. 2. Block of Carboniferous Limestone composed of columnals of 



? Actinocrinus. Castleton, Derbyshire. 

 FIG. 3. Block of Bathonian Limestone composed of Millevicrinus. 



Lansdowne, near Bath. 



