INDIANA PALEONTOLOGY. 38. 



ZAPHRENTIS ALBERSI, N. Sp. 



Plate 15. Figs. 9-10-11 



Corallum simple, turbinate, majority of specimens slightly compressed, 

 straight, or gradually curved. Acute at the point of attachment Gradually 

 increasing in diameter to the calix. Height varying in different individuals, 

 from thirty to thirty-five millimeters. Calix somewhat compressed, twenty five 

 millimeters in its longest diameter. Depth fifteen millimeters. A flat space 

 in the bottom of the calix, occupied by the tabula, ten millimeters in diameter. 

 Number of lamellie, ninety, in the circumference of a calix, twenty-five millime- 

 ters in diameter, slightly unequal 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 two millimeters of the center, and abruptly 

 ends, leaving a convex space in the center of the calix, four millimeters 

 in diameter. Fossette consists of a deep depression at the margin of the con- 

 vex space in the center of the cup, and extends to the margin of the calix. 

 Exterior with shallow, irregular annulations, and constrictions, caused by peri- 

 odical growth; longitudinal striae distinct, seven in the space of five millime- 

 ters. 



The specific name is in honor of Mr. A. Albers, of Cincinnati, Ohio, the 

 artist who engraved the figures on this plate. 



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

 the Ohio. Now in the collection of the author. 



CYATHAXONIA BORDENI, N. Sp. 



Plate 14. Figs. 3-4-5-6. 



Corrallum simple, turbinate, regularly curved. Acute at the base of at- 

 tachment, regularly, and gradually expanding in diameter to the calix. Height 

 twenty to twenty-five millimeters. Diameter of calix eight millimeters. Depth 

 five millimeters, with nearly vertical walls. A smooth conical elevation in the 

 bottom of the calix, two millimeters in diameter at the base, and three millime- 

 ters in height. Number of lamellae, thirty-six, in the circumference of a calix 

 eight millimeters in diameter, broadly rounded, and equal in size at the margin, 

 alternating below, rapidly sloping to the bottom of the calix, where the short 

 ones terminate ; the longer ones continue, to the margin of the smooth conical 

 space, and abruptly end. No fossette visible in any of the examples exmained. 



