INDIANA PALEONTOLOGY. 62. 



HELIOPHYLLUM, AMPLIATUM, N. Sp . 



Plate 22. Figs. 1-2. 



Corallum simple, turbinate or subturbinate, straight, or regularly curved. 

 Acute at the base of attachment. Gradually enlarging in diameter to the 

 calix. Height varying in different individuals from forty to one hundred 

 millimeters or more. Exterior very rugged, with deep constrictions and 

 wrinkles, caused by intermittent growth. When decorticated, it has the ap- 

 pearance of a number of thick invaginated cups. Calix broad, slightly oblique, 

 forty-five millimeters in diameter. Depth twenty millimeters. A flat space in 

 the bottom of the calix. occupied by the tabula^ twenty-five millimeters in di- 

 ameter. Number of lamellae ninety, in the circumference of a calix forty-five 

 millimeters in diameter, equal in size at the margin, alternating below for 

 about five millimeters from the margin, they are flat or slightly oval; then 

 gradually slope to the bottom of the calix, where the short ones gradually dis- 

 appear; the larger ones are slightly elevated and sharp, and continue on the 

 tabulae to near the center of the calix, and abruptly end, leaving a narrow 

 groove in continuation of the fossette. Fossette consists of a deep depression 

 at the anterior side of the tabula?, gets narrower and thinner, and disappears 

 before reaching the margin of the calix. Denticulationsivery coarse, from 

 one to one and a half millimeters apart. 



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

 the Ohio. Now in the collection of the author. 



HELIOPHYLLUM CONIGERUM, N. Sp. 



Plate 22. Figs. 3-4. 



Corallum simple, turbinate, or elongate turbinate. Straight or slightly 

 curved. Acute at the base of attachment. Height seventy millimeters. 

 Gradually enlarging in diameter to the calix. Exterior with distant, shallow 

 constrictions and wrinkles, caused by intermittent growth. Calix somewhat 

 bell-shaped, thirty-five millimeters in diameter. Depth twenty-five millimet- 

 ers. Situated in the bottom of the calix, is a convex elevation, caused by 

 the elevation of the tabulae, ten millimeters in diameter, and five millimeters in 

 height. Number of lamellae, one hundred and twelve, slightly unequal in 

 size at the margin, alternating below, for about five millimeters gradually, 

 then rapidly slope to the bottom of the calix, where the short ones termi- 

 nate, the longner ones continues to the conical elevation in the center of the ca- 



