INDIANA PALEONTOLOGY. 85. 



HELIOPHYLLUM I G NOT UM, N. Sp. 



Plate 28, Figs. 1-2. 



Corrallum simple, turbinate, or elongate turbinate, straight or curved, 

 sometimes distorted or geniculated. In some examples the point of attach- 

 ment is sharp, and in others there is a small scar that extends a short distance 

 above the base. No root-like processes has been discovered on any of the speci- 

 mens in my collection. Rapidly increasing in diameter to the calix. Height 

 five inches; diameter of calix from two to two and one-half inches. Depth 

 twenty-five millimeters. Number of lamellae one hundred and twenty, in a 

 calix fifty millimeters in diameter, unequal in size at the margin, alternating 

 below, abruptly sloping to the bottom of the calix, where the short ones 

 terminate, or coalesce with the longer ones, and continue to the center of the 

 calix, for the last five or six millimeters, very faintly indicated on the tabulae, 

 fossette in some cups is strongly defined, in others it is interrupted by 

 the coalescing and twisting of the lamellae at that point; the position depends 

 upon the curviture of the corallum ; it is usually situated on the side of the 

 longest curviture of the coral. Extericr with strong rounded annulations, and 

 deep constrictions caused by periodical growth, denticulations coarse, about 

 one millimeter apart. 



Found in the Upper Devonian (Hamilton group) near Charlestown, Indi- 

 ana, now in the collection of the author. 



HELIOPHYLLUM, ADNASCENS, N. Sp. 



Plate 28. Figs. 3, 4-5. 



Corallum simple or composite, increasing by calicular gemmation. Acute 

 at the base of attachment. Sometimes there is a broad scar on the side, near 

 the base of the corallum. Gradually and in some examples more rapidly ex- 

 panding in diameter to the calix. Height from twenty to sixty millimeters. 

 Calix broad, bell-shaped, from thirty to sixty millimeters in diameter. Num- 

 ber of lamellae one hundred and four, in the circumference of a cup sixty milli- 

 meters in diameter, alternating in length, equal in size and rounded at the 

 margin, becoming sharp as they descend to the bottom of the calix, where the 

 short ones abruptly end; the longer ones continue coalescing, twisting, and is 

 elevated into a convex cone, five millimeters in height. Fossette consists of a 

 shallow depression in the bottom of the calix, continuing a short distance on 

 the side of the cup, and disappears. Denticulations rather strong, sharp, ten 

 in the space of eight millimeters, 



Found in the Upper Devonian (Hamilton group) near Charlestown, Indi- 

 ana, now in the collection of the author. 



