PLATE VII. 

 TECTULIPORA. 



(Page 511.) 



Tectulipoea biperfoeata. 



Fig. 1. A transverse section of branches and carinas. xl8. 



Fig. 2. A side view of a branch, showing sections of the dissepiments 



and their caringe. xl8. 

 Fig. 3. An enlargement from the noncelluliferous face of a frond. 



xl8. 

 Fig. 4. An enlargement from the celluliferous face of a frond. xlS. 

 Fig. 5. An enlargement, showing the summits of the carinae of the 



branches and dissepiments. xl8. 

 Upper Helderberg group. Walpole, Ontario. 



LOCULIPORA. 



(Page 511.) 



LOCULIPOEA PEEFOEATA, Hall. 



Fig. 6. A side view of a branch, showing a section of the dissepiments 



and their carinae. x6. 

 Fig. 7. A transverse section of three of the branches and their carinae. 



xl8. 

 Fig. 8. An enlargement from the noncelluliferous face of a frond. 



x6. 

 Fig. 9. An enlargement of the summits of the carinae of the branches 



and dissepiments. x6. 

 Fig. 10. An enlargement. The lower portion of the figure shows the 



celluliferous face of the branches; the upper portion the 



summits of the carinae. x6. 

 Fig. 11. An enlargement from the celluliferous face of a frond. x6. 

 Fig. 12. A portion of a frond, natural size. 



Lower Helderberg group. Albany county, N, Y, 



632 



