PLATE VII 



PAGE 



Fig. 1. STEREOLASMA RECTUM (Hall) 119 



Upright view of corallum. X l 1 /^. Romney formation, Hamilton mem- 

 ber, Ernstville. 



Fig. 2. CF. AMPLEXUS HAMILTONI^, Hall 120 



Upright view of corallum. Romney formation, Hamilton member, 

 Evitts Creek. 



Fig. 3. HELIOPHYLLUM sp 121 



Upright view of part of corallum, epitheca partly exfoliated showing 

 the septa. X l 1 ^. Romney formation, Hamilton member, 

 Ernstville. 



Figs. 4, 5. CYSTIPHYLLUM AMERICANTJM Milne-Edwards and Haime (?).. 121 



4. Upright view of corallum. 



5. Transverse section of the same. 



Romney formation, Hamilton member, Evitts Creek. 



Fig. 6. POLYGNATHUS sp. undet 122 



Incomplete jaw. The tips of four or five teeth which were discernible 

 on the specimen are not brought out in the illustration. Tonolo- 

 way. (After Kindle.) Romney formation, Onondaga member. 



Figs. 7-9. RHOPALONARIA TENUIS Ulrich and Bassler 123 



7, 8. Two small portions of the zoarium which on account of the fre- 

 quent crossing of the branches do not show the characteristic 

 pinnate arrangement of the rows of cells. X 9. 

 Romney formation, Hamilton member, Evitts Creek. 



9. View of one of the type specimens of this species. (After Ulrich 



and Bassler.) Thedford, Ont. X 9. 



Figs. 10-12. MONTICULIPORA (?) MARYLANDENSIS Ulrich and Bassler n. sp. . 123 



10. Vertical section, showing tabulation. X 20. 



11. Tangential section. X 20. 



12. Several zorecia of same, to show structure of walls and acantho- 



pores. X 35. 



Romney formation, Hamilton member, Evitts Creek. 



