

548 



Report of the State Geologist. 



Helopoba, Hail. 



(Pal. K Y., Vol. ir, p. 44. 1853.) 



Type, Helojporafragilis^ Hall. 



Zoarium consisting of numerous, subequal, small cylindrical 

 segments, articulating terminally ; cellulif erous on all sides ; cell 

 tubes somewhat oblique, rectangular to the surface, or geniculate j 

 cell apertures oval ; arranged in a diagonally intersecting series 

 or in longitudinal series separated by ridges. 



114 



Pigs. 113, 114. Helopora Harrisi ; two segments, natural size and xl 

 Fig. 115. Vertical section, and transverse section, x50. 



SoEPTBOPOBA, Ulrich. 



(American Geologist, Vol. I, p. 228. 1888.) 



Type, Sceptroporafacula, iTlrich. 



Segments club shaped ; the lower half striated ; noncellulif erous ; 

 the extremity bulbous ; upper half expanded ; the center of the 

 top with a large socket ; cells tubular, arranged between vertical 

 lines ; apertures ovate. 



