203. CONTRIBUTION TO 



surface of the calix is covered with coarse vesicles, varying in size from one to 

 three millimeters in diameter. The exterior is very rugged and when decorti- 

 cated appears as coarse invaginated cups. The surface cysts are not so large 

 as those in the calix, and are not so deeply pitted, and are somewhat oblong. 

 The margins of the corallites when in contact are very much elevated, and ap- 

 pear as sharp ridges. 



The coarse rugged appearance of the corallum, its composite form, and the 

 large round vesicles in the calix, and the elevated margins of the corallites 

 where in contact, makes this easily recognized from all other species. 



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

 the Ohio, Now in the collection of the author. 



CYSTIPHYLLUM CONSPICUUM, N. Sp. 



Plate 60. Figs. 6, 7, 8. 



Corallum simple, or composite. Acute at the point of attachment. Some 

 examples have root-like prolongations near the base, that served as attachment 

 for support. Height varying in different examples, from twenty to seventy 

 millimeters. The margin of the calix is generally very thin and bell-shaped, 

 from ten to forty millimeters in diameter. Depth from twenty to fifty millime- 

 ters. In some examples there is a strong silicified coating, from one and a 

 half to two millimeters in thickness, covering the entire calix, when this silici- 

 fied coating is very thick, the cysts appear as swellings or nodes, but when the 

 coating is thin or weathered away, numerous cysts appear somewhat small at 

 the margin of the cups, but getting larger as they approach the center of the 

 calix. Corallites in composite examples vary in size from twenty to forty mil- 

 limeters in diameter. Depth from ten to twenty millimeters. Exterior when 

 decorticated is somewhat rugged and has the appearance of being composed of 

 a series of thick invaginated vesicles, with their upper margins broken off. 



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

 the Ohio. Now in the collection of the author. 



CYSTIPHYLLUM CRENATUM, N. Sp. 



Plate 59. Figs. 12, 13, 14, 15, 16, 17, 18, 19, 20. 



Corallum simple, turbinate, or subturbinate. With a broad scar at the 

 base of attachment. Height from five to forty millimeters, varying in different 

 individuals. Diameter of calix ten to twenty millimeters. Depth ten to fif- 

 teen millimeters. Exterior rather rough, having the appearance of a number 

 of thin invaginated cups with crenulated margins. Diameter of calix from fif- 



