INDIANA PALEONTOLOGY. i46. 



HELIOPHYLLUM CONGLOMERATUM, N. Sp. 



Plate 43. Upper Figube. 



Corallum composite, globular, or hemispherical. Rapidly increasing by 

 calicular gemmation. Corallites varying from ten to thirty millimeters in diam- 

 eter, broadly canipanulate, intimately united at their superior margins. Depth 

 •from ten to fifteen millimeters. A convex space in the bottom of the calix, occu- 

 pied by the tabulas from five to ten millimeters in diameter; in some cups the 

 tabulae is smooth, and tiut; in some others, it is slightly elevated in the center 

 of the calix. Number of lamellae from eighty to ninety, equal in size and rounded 

 at the margin, alternating below, gradually or sometimes rapidly sloping to the 

 bottom of the calix where the short ones abruptly terminate, the longer ones 

 continue in some cups to wiihin two or three millimeters of the center, and, ab- 

 ruptly end, leaving a smooth space, in the center of the calix, from four to six 

 millimeters in diameter; in these cups the tabulie is usually flat; in the cups 

 that have elevated tabula?, the long lamella extends to the center, twisting, into 

 a small crest, on the elevated tabula?. Denticulations moderately large, eight 

 in the space of five millimeters. Fossette consists of a slight depression in the 

 bottom of the calix, but gradually disappears before reaching the margin of the 

 cups. Position variable. 



Found in the Middle Devonian (Upper Helderberg group) at the Falls of 

 the Ohio. Now in the collection of the author. 



HELIOPHYLLUM CONGREGATUM, N. Sp 



Plate 43. Lower Figure. 



Corallum simple or compound, rapidly increasing by calicular gemmation. 

 Corallites very much crowded at the margin of the parent cup, separating as 

 they increase in height, The free portions are surrounded by a strong, rough 

 ^pithecal crust, occasionally they intimately connect by their epithecal walls. 

 Exterior with irregular, strong, rounded annulations, and deep constrictions, 

 caused by periodical growth. Varying in height from thirty to forty millime- 

 ters, Calix somewhat campanulate, varying in diameter from ten to thirty milli- 

 meters. Depth fifteen millimeters, with a flat space in the bottom of the calix, 

 occupied by the tabuUe, from ten to fifteen millimeters wide. Number of la- 

 mella? sixty to seventy, equal in size at the margin, alternating below, for about 

 five millimeters from the margin flat or slightly oval, then gradually or in 

 some cups rapidly slope to the bottom of the calix, where the short ones grad- 

 ually disappear, the longer ones continue to the center, coalescing, fasciculating. 



