ANTHOZOA—TETRACORALLA. 



73 



again become round. Septa crenulate alternating, the longer 

 abutting against the inner wall. 



Fig. 112. Eridophyllum vernuillianum FlG. 113,0. EriUophyllum rug sum ; 

 (after Billings). b, c. Synaptophyllum simcoense (after 



Simpson). 



In the Onondaga beds of Canada, Michigan and the Falls of 

 the Ohio. 



XXIII. Synaptophyllum Simpson. 



Like Eridophyllum but without the central wall, the septa extend- 

 ing across the tabulate area to near the center. Proliferations from 

 all sides of the tubes. Dev. 



54. S. simcoense Billings. (Figs. 113^-115.) Devonic. 



Similar in form to Eridophyllum vernuillianum but smaller in 



diameter, i. e., from 4 to 6.5 mm. and distant 



the same amount or somewhat less. Septa 



from 40 to 50. 



In the Onondaga limestone of New York, 

 Canada, Michigan and the southwest. 



55. S. stramineum Billings. (Fig. 116.) 



Devonic. 



Tubes from 4 to 5 mm. in diameter varying 



from almost in contact to more than twice 



their width apart. Central tabulate area large, 



septa about 40, extending to near center. 



In the Onondaga limestone associated with the preceding. 



Fig. 1 14. Synapto- 

 phyllum simcoense (after 

 Billings). 



XXIV. Diplophyllum Hall. 

 Corolla similar to Synaptophyllum but without the connecting 

 epithecal expansions. Tabulate area large. Sil.-Dev. 



