''^- CONTRIBUTION TO 



There are some specimens in which the expansions occur at intervals of 

 less than one line, and they are even so close together that the coral appears at 

 first sight to be a large sub-globular mass of concentric laminae. I do not at 

 present think these can be separated as a distinct species from those with ex- 

 pansions one or two lines distant. 



Locality and formation, Township of Walpole, eorniferous limestone. 



The specimen illustrated on plate 58 is from the Middle Devonian, (Upper 

 Helderberg group) at the Falls of the Ohio. Now in my collection. 



HELIOPHYLLUM C O N D I T U M, N. Sp. 



Plate 58. Figs. 3, 4, 5, 6. 



Corallum simple, or compound, turbinate, straight or slightly curved. In- 

 crease by calicular gemmation. Acute at the base of attachment. Height 

 varying from ten to forty millimeters. Exterior with fine annulations and con- 

 strictions, caused by intermittent growth. Diameter of corallites varying from 

 fifteen to thirty millimeters. Depth ten to fifteen millimeters. Number of la- 

 mellae seventy-four in the circumference of a calix twenty-five millimeters in 

 diameter, slightly unequal in size at the margin, alternating below, for about 

 three millimeters, nearly flat, then abruptly slope to the bottom of the calix, 

 where the short ones terminate, the longer ones continue, coalescing, f ascicu- 

 lating and twisting into an elevated labyrinthine mass in the center of the 

 calix, giving to the calix a sponge-like appearance. Denticulations moderately 

 fine, twelve in the space of eight millimeters. Fossette consists of a slight de- 

 pression at the anterior side of the tabulae, and extends for a short distance on 

 the side of the calix. 



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

 ana. Now in the collection of the author. 



DIPHYPHYLLUM DIL A T U M, N. Sp. 



Plate 58. Figs. 9, 10, 11, 12. 



Corallum simple, turbinate, straight or slightly curved, acute at the point 

 of attachment, occasionally a specimen has root-like prolongations near the base 

 that served as attachment for support. Height varying in different examples, 

 from ten to twenty-five millimeters, the largest example I have seen has a 

 height of twenty-five millimeters. Diameter of calix twenty-five millimeters. 

 Depth ten millimeters. The center of the calix is occupied by a horseshoe-shape 

 area with slightly elevated margins, central portion smooth three millimeters 



