37. CONTRIBUTION TO 



ZAPHRENTIS OPPELTI, N. Sp. 



Plate 14. Figs. 10-11-12-13. 



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

 base of attachment, gradually, and regularly expanding to the ealix. Height 

 varying in different individuals, from twenty to forty millimeters. Exterior 

 with strong, rounded longitudinal stride, ten in the space of eight miilimeters ; 

 and numerous sharp constrictions and wrinkles, caused by intermittent growth. 

 Diameter of calix, from ten to eighteen millimeters. Depth, twelve millimeters. 

 A smooth, convex space in the bottom of the calix, six millimeters in 

 diameter. Number of lamellae, sixty-four, in the circumference of a calix, 

 eighteen millimeters in diameter, slightly rounded, and very unequal in size at 

 the margin, alternating below, the short ones merely rudimentary ; the longer 

 ones gradually slope to the smooth convex space in the bottom of the calix, and 

 abruptly terminate. Fossette consists of a deep depression, at the anterior 

 margin, of the smooth convex space in the bottom of the cup, and extends to 

 the margin of the ealix. 



The specific name is in honor of Dr. Otto Oppelt, of New Albany, Ind., 

 an expert chemist, and an ardent collector. 



Found in the Knobstone group, (sub-carboniferous), at Stone's Farm, one 

 and one-half miles east of Bridgeport, Clark county, Indiana. Now in the 

 collection of the author. 



ZAPHRENTIS BREVICORNIS, N. Sp. 



Plate 15. Figs. 7-8. 



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

 base of attachment. Regularly expanding in diameter to the calix. Height 

 on the side of the longest curviture, seventy millimeters; shortest side, thirty-five 

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

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

 the tabula?, eight millimeters in diameter. Number of lamellae, one hundred in 

 the circumference of a calix, thirty-five millimeters in diameter ; unequal in size 

 at the margin, alternating below ; the short ones are twelve or fifteen millimeters 

 in length, the longer ones continue to the smooth convex space in the center of 

 the calix, and abruptly end. Exterior with a few broad, rounded annulations 

 and deep constrictions, cavised by intermittent growth. Fossette consists of a 

 slight depression at the anterior margin of the convex space, in the bottom of 

 the cup, and continues as a shallow groove to the margin of the calix. 



Found in the upper Devonian (Hamilton group), near Charlestown, and 

 in the strippings, above the cement rock, at the different quarries throughout 

 Clark county, Indiana. Now in the collection of the author. 



