152 Cincinnati Society of Natural History. 



Genus i. — Heliolites (Guettard) Dana. 1846. 



Corallum spheroidal, pyriform, hemispherical, or rarely 

 ramose, composed of numerous closely contiguous corallites, 

 divisible into two series; larger corallites cylindrical, com- 

 paratively few, with twelve lamellar infoldings of the wall, of 

 the nature of pseudo-septa, which fall short of the axis of the 

 visceral chamber ; small corallites completely investing the 

 larger ones, more or less polygonal, with distinct walls, com- 

 pletely amalgamated with one another and with the walls of 

 the larger tubes, but not known to be provided with apertures 

 allowing lateral communication ; small tubes without septa, 

 but with numerous straight and complete tabukc, similar but 

 less numerous ones being found in the larger tubes ; no col- 

 umella. (Mem., vol. 3, p. 454, pi. 22, Figs. 13, 14; Dana, U. S. 

 Exploring Exped., vol. 8, Zoophytes, 1846, p. 541 ; Nicholson, 

 Pal. Tab. Cor., 1S79, p. 243.) 



Remarks. — As noted above, the generic name appears to 

 have been first used by Guettard, and was adopted by Dana 

 in 1846. His description is quite meager, and therefore the 

 more complete one given above has been taken from Nichol- 

 son. 



I. — M. .SHEi'-VKDi, James, 1878. 



Corallum hemispheric or discoid, from one-half an inch to 

 an inch in diameter ; cell apertures one-half a line to a line in 

 diameter, generally two or more lines apart, sometimes only 

 one line ; margins thin, little, or not at all elevated above the 

 surface; septa twelve, well developed; spaces between the 

 corallites thickly set with pit-like markings (cells) ; base of 

 corallum flat, convex, or with a groove between the outer 

 edge and a saucer-like depression in the center ; internal 

 structure unknown. (The Paloeontologist, No. i, July 2, 1878, 

 p. 2.) 



Locality. — Brush Creek. Adams Co . O. 



Remarks. — It is to be regretted that it is impossible to figure 

 this species. Only four specimens were known to Mr. James, 

 and these, together with a description, were deposited with 

 the publication committee of a scientific society, and have 

 never been seen since. The pul)lication of the description in 



