INDIANA PALEONTOLOGY. 4Z 



ZAPHRENTIS ALBUS, N.Sp. 



Plate 16. Ftgs. 11-12. 



Corallum simple, turbinate, irregularly curved, a small scar at the base of 

 attachment. Height thirty millimeters, for about t€n millimeters, rapidly, then 

 gradually expanding in diameter to the ealix. Exterior, with sharp annulations, 

 and deep constrictions, and wrinkles, caused by intermittent growth. Calix 

 very thin and somewhat campanulatc, twenty millimeters in diameter, with 

 nearly vertical walls. Depth twelve millimeters, tabulae smooth, flat, occupying 

 slightly less, than the entire diameter of the corallum. Number of lamellae, 

 sixty, in the circumference of a calix, thirty millimeters in diameter, somewhat 

 sharp, and slightly unequal in size at the margin, alternating below, the short 

 ones becoming thinner as they approach the bottom of the calix, and are faintly 

 indicated on the margin of the tabula?, the longer ones, are slightly elevated 

 growing thinner as they descend to the bottom of the calix, and abruptly end, 

 leaving a smooth convex space in the bottom of the calix, ten millimeters in 

 diameter. Fossette, consists of a shallow depression on the anterior side of the 

 tabulae, but does not extend on the side of the calix. 



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

 jSow in the collection of the author. 



ZAPHRENTIS CURTUS, N. Sp. 



Plate 16. Figs. 13-U. 



Corallum simple, turbinate, straight or regularly curved. Acute at the 

 base of attachment, rapidly expanding in diameter to the calix. Height forty- 

 five millimeters. Calix broad, thirty-five millimeters in diameter. Depth 

 fifteen millimeters. A convex space in the bottom of the calix, occupied by the 

 tabulae, fifteen millimeters in diameter. Number of lamellae, one hundred and 

 thirty-eight, in the circumference of a calix, thirty millimeters in diameter, 

 thin and sharp, and equal in size at the margin, alternating below, gradually 

 sloping to the bottom of the calix, where the short ones terminate; the longer 

 ones continue to within four or five millimeters of the center of the calix, and 

 abruptly end leaving a smooth convex space in the center of the cup, 

 from eight to ten millimeters in diameter. Fossette consists of deep depression, 

 on the anterior side of the smooth ccmvex area, but does not continue on the 

 side of the ealix. The lateral gaps, are represented by two small depressions, 



