PLATE LIV—Continued. 
Fenestella (Loculipora) circumstata. 
Page 144. 
Fig. 22. An enlargement of the celluliferous face ; the Carinas, having been broken away, showing the form 
and arrangement of the cell apertures. 
Fig. 23. An enlargement; the lower portion of the figure represents the non-celluliferous face ; the upper 
right hand portion represents a specimen with the non-celluliferous face broken away, show¬ 
ing the base of the reverse side. (X 6.) 
Fig. 24. An enlargement, showing reverse side, corresponding to the summits of the carinse and connect¬ 
ing scalae of Hemitrypa ; the lower right hand corner represents this tissue broken away, show¬ 
ing the celluliferous face of the frond. (X 6.) 
Fig. 25. An enlargement of the non-celluliferous face of a frond similar to the preceding. (X 6.) 
Upper Helderberg group. Walpole, Ontario, Canada. 
