INDIANA PALEONTOLOGY. i6. 



twisted, and terminates, a few extend to the top of the elevation, and gives it 

 the appearance of a rough cone. Fossette commences at the bottom of the ca- 

 lix, and continues to the anterior margin. Dentieulatious rather obscure, due 

 to the weathered condition of the corallum. 



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

 ana. Now in the collection of the author. 



HELIOPHYLLUM G U R LE YI, N. Sp. 



Plate 6. Fig. 1. 



Corallum simple, or compound, with a broad scar at the base of attachment, 

 rapidly expanding in diameter to the margin of the calix. Exterior with coarse 

 annulations and wrinkles, caused by intermittent growth. Height varying 

 from fifteen millimeters to five inches; the longest examples are simple ones. 

 Diameter of calix, varying in compound corallums, from fifteen to sixty-five 

 millimeters. Depth twenty millimeters. A flat space in the bottom of the ca- 

 lix, occupied by the tabula?, from five to ten millimeters in diameter, in some 

 of the cups, the flat space is smooth, in others, the ends of the lamellie are 

 broken up and gives to the bottom a rugose appearance. Number of lamella? 

 seventy-four in the circumference of a calix, thirty millimeters in diameter 

 sub-equal, rounded, and slightly flattened at the margin, for about ten millime- 

 ters nearly flat, then abruptly sloping to the bottom of the calix, where the 

 short ones terminate, the longer ones are very much elevated, becomes sharper 

 as they continue to the center of the calix.^ Fossette consists of a shallow nar- 

 row groove, commencing at the flat space in the bottom of the cup, and continu- 

 ing about half way to the anterior margin. Denticulations coarse, well defined, 

 from ten to fifteen in the space of ten millimeters. 



The specific name is in honor of Prof. Wm. F. E. Gurley, ex-State Geolo- 

 gist of Illinois, an ardent collector, and a good Palteontologist. 



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

 the different cement quarries, in Clark county, Indiana. Now in the collection 

 of the author. 



