INDIANA PALEONTOLOGY. 44. 



center of the calix, coalescing, and abruptly terminate, leaving a smooth flat 

 space, from two to four millimeters in diameter, in some examples the lamellae 

 continues until it meets those on the opposite side, and abruptly* end, leaving the 

 bottom of the calix flat. Fossette consists of a slight depression near the center 

 of the calix, and continues to the anterior margin. 



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

 Now in the collection of the author. 



ZAPHRENTIS LAMASTERI. N. Sp. 



Plate 17. Figs. 4-5. 



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

 base of attachment. Height sixty-five millimeters. Calix slightly or broadly 

 bell-shaped, thirty millimeters in diameter. Depth twenty millimeters. Walls 

 nearly vertical. A convex space in the bottom of the calix, occupied by the 

 tabulffi, fifteen millimeters in diameter. Number of lamellae, eighty in the 

 circumference of a calix, thirty millimeters in diameter, equal in size, and 

 broadly rounded at the margin, getting thinner, and alternating below, abruptly 

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

 ones continue, to within two or three millimeters of the center of the calix, and 

 abruptly end, leaving a flat smooth convex space in the bottom of the calix, five 

 or six millimeters in diameter. Exterior with numerous irregular annulations, 

 and shallow constrictions, and wrinkles, caused by intermittent growth. Fossette 

 consists of a deep depression, on the sinistral side of the tabulae but does not 

 extend on the side of the calix. 



Found in the upper Devonian (Hamilton group) by Mr. Thomas J. Lamas- 

 ter, of Speed, in whose honor, the specific name is given, at the Clark county 

 cement quarries, Clark county, Indiana. Now in the collection of the author_ 



ZAPHRENTIS INSOLENS. N. Sp. 



Plate 18. Figs. 1-2. 



Corallum simple, turbinate, or elongate turbinate, straight or curved, 

 attenuate at the base of attachment, gradually or sometimes more rapidly 

 expanding in diameter to the calix. Height from sixty to one hundred milli- 

 meters, or more, varying in different individuals. Exterior with broad shallow 

 annulations, and occasionally, a few deep constrictions. Calix oblique, rather 

 deep, with the extreme margins slightly contracted, with a diameter of forty 



