125 



Distinguishing Characters. — Simple 

 corallum; cylindrico-conical or turbi- 

 nate outline with moderate curvature 

 at the base; circular and moderately 

 profound calyx; small tossula ; well- 

 pronounced, but rather small, carinse; 

 strongly wrinkled epitheca. 



Found abundantly in the coral 

 layer of the lower Moscow shales, at 

 Sections 5 to 7, and on the Lake 

 Shore; also in theDemissabedof Sect- 

 ion 5 (one specimen). 



Fig. 

 (after Hall) 



Heliophyllum hulli 



Fig. 8. Heliophyllum confluens. From a specimen in the Student Palseontological col- 

 lection of Harvard University. Cat. No. 233. (.Original.) 



