INDIANA PALEONTOLOGY. J7. 



H E L I O P H Y L L U M B E S U M, N. Sp. 



Plate 7, Figs. 1-2-3-4. 



Corallum simple, or compound, increasing by calicular gemmation, with a 

 strong blunt base of attachment. Gradually, or at times, rapidly expanding in 

 diameter to the calix. Height from forty to seventy millimeters. Usually 

 straight. Diameter of calix from twenty to forty millimeters. Depth fifteen 

 to twenty millimeters. Situated in the center of the calix, is a convex elevation 

 formed by the elevated tabulae, five millimeters in height, and from five to ten 

 millimeters in diameter. Number of lamella?, one hundred and ten, in the cir- 

 cumference of a calix, forty millimeters in diameter, unequal in size at the mar" 

 gin, alternating below, gradually sloping to near the bottom of the calix, where 

 the short ones terminate, or coalesces with the longer ones. The longer ones con- 

 tinue, coalescing Avith the adjacent primary ones, and a few continue to the 

 top of the elevated tabulae, twisting, and giving to the convex elevation, a cor- 

 rugated appearance. This feature is more strongly pronounced, in some ex- 

 amples, than in others. Exterior, when decorticated, has the appearance of a 

 number of thin invaginated calices. Fossette well pronounced, it consists of 

 a shallow depression in the bottom of the cup, near the convex elevation, and 

 continues to the margin of the calix; position variable. 



Found in the upper Devonian (Hamilton group) near Charlestown, and 

 at the different cement quarries throughout Clark County, Indiana. Now in 

 the collection of the author. 



H E L I O P H Y L L U M S E A M A N I, N. Sp, 



Plate 7, Fig. 5. 



Corallum simple, or compound. Usually straight, or slightly curved. 

 Rather blunt at the base of attachment. With a few strong root-like processes, 

 that served for attachment to other objects for support. Height of entire coral- 

 lum, one hundred and twenty millimeters. Diameter of parent calix forty mil- 

 limeters. Depth twenty-five millimeters, with steep walls. Number of lamellae 

 ninety-six, in the circumference of a calix, forty millimeters in diameter, un- 

 equal in size at the margin, alternating below, rapidly sloping to the bottom of 

 the calix, where the short ones gradually disappear, the longer ones continue to 

 within two or three millimeters of the center, coalescing, and abruptly termi- 

 nate, leaving a smooth convex space in the bottom of the calix four or five mil- 

 limeters in diameter. Exterior when decorticated very rugose. With numer- 

 ous, sharp annulations, and constrictions, caused by periodical growth. Coral- 



