ANTHOZOA—OCTOCORALLA. 



97 



In the Niagara group of Michigan, Iowa and the Falls of the 

 Ohio. Also at Anticosti. 



XLVI. Heliolites Guettard. 

 Corallum compound, varying from spheroidal to flabellate, with 

 large cylindrical macrocorallites, furnished with twelve infoldings 

 of the wall, or pseudosepta, and numerous angular microcorallites 





Fig. 155. Lyettia americana (Ind. Geol. Surv.). 



investing the larger ones. Tabulae in both corallites, more numer- 

 ous in the smaller. No mural pores. Basal peritheca present. 

 Ord.?-Dev. 



126. H. megastoma McCoy. Siluric. 

 Convex heads with the macrocorallites about 2 mm. in diameter 



and distant somewhat less. Twelve very short pseudosepta. Form 

 subglobular. 



In the Niagara group of New York, Canada, Michigan, Iowa, 

 Wisconsin, etc. 



127. H. interstinctus Linn. (Figs. 156, 158, a, b.) 

 Discoid or in leaf-like expansions with a basal peritheca. 



Siluric. 

 Macro- 



rnmm 



^m^mmk 



mm 



mm 



V*3tf 



Fig. 156. Heliolites interstinctus ', with part of surface enlarged (after Roemer. ) 



