INDIANA PALEONTOLOGY. 56. 



HELIOPHYLLUM, SPICULATUM. N. Sp. 



Plate 19. Fig. 1. 



Corallum simple, broadly turbinate, a portion of the base is broken off, but 

 was acute at the point of attachment when perfect. Rapidly increasing 

 in diameter to the calix. Height five inches; diameter of calix three and one- 

 fourth inches. Depth fifteen millimeters. Situated in the center of the calix, 

 is a broad space occupied by the tabulae twenty millimeters in diameter^ 

 somewhat undulating with a few spine like projections scattered over the 

 surface. There is fifteen lamellse in the space of fifteen millimeters, very thin 

 and sharp at the margins, and in some places wider apart than in others, alter- 

 nating below, the short lamellae does not reach to the undulating tabulae. The 

 long lamellae is thin and sharp and in some places is not denticulated; they 

 reach to the undulating tabulae, coalescing with two or three of the adjacent 

 lamellae and twisting, giving to this portion of the calix a very rugose appear- 

 ance. In that part of the corallum where the lamellae is broad and distant the 

 sides are decorated with numerous spines, these appear more or less promiscu- 

 ous throughout the corallum. Exterior when decorticated has the appearance 

 of a series of thin invaginated cups with their margins erenulated. Denticula- 

 tions moderately large, more strongly pronounced on the shorter lamellae, than 

 on the longer ones. ' Fossette consists of a deep depression on the side of the 

 shortest curvature of the coral, and extends to the margin of the cup. 



Found in the middle Devonian (upper Helderberg group) at Straw's mill, 

 Clark county, Indiana. Now in the collection of the author. 



CYSTELASMA, SEPTATA. N. Sp. 



Plate 19. Figs. 10-19. 



Corallum simple, turbinate, straight or slightly curved. Acute at the 

 point of attachment. Some examples have a broad scar at the base, and occa- 

 sionally one has root like prolongations that served for attachment and support. 

 Height varying in different individuals from ten to twenty millimeters. Grad- 

 ually enlarging in diameter to the calix. Diameter of calix from five to eight 

 millimeters. The internal portion of the corallum is divided into three, four 

 and sometimes five compartments, by vertical walls, extending the entire length 

 of the coral. The tabulte is well developed in each of these compartments, flat, 

 oblique or funnel-shaped, closely arranged, or some little distance apart. 

 All these features may be observed in .a single corallum. No septa observed in 

 any of the examples in my collection. 



Found in the "Warsaw division of the St. Louis group (Sub-carboniferous) 

 at Lanesville, Harrison county, and at Spergen Hill in Washington county, 

 Indiana. Now in the collection of the author. 



