179. CONTRIBUTION TO 



nate, leaving a broad, deep concave space in the bottom of the cup, twenty 

 millimeters in diameter. Fossette Consists of a deep depression at the margin 

 of the concave area, and continues as a deep groove to the anterior margin. 



Found in the Upper Devonian (Hamilton group) in the strippings above 

 the cement rock throughout Clark county, Indiana. Now in the collection of 

 the author. 



ZAPHRENTIS HALLI. E. & H. . 



Plate 53. Figs. 3, 4. • 



Corallum simple, turbinate, or elongate turbinate. Acute at the point of 

 attachment, rapidly expanding in diameter to the calix. Height varying in 

 different individuals from sixty to (Jne hundred millimeters or more. Calix 

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

 ers. TabuUe flat or slightly depressed in the center of the cup, twenty-five mil- 

 limeters in diameter. Number of lamellae one hundred and six in the circum- 

 ference of a calix forty millimeters in diameter, sharp and unequal in size at the 

 margin, alternating below, rapidly slope to the bottom of the calix, and extend 

 a short distance on the tabulse, where the short ones abruptly terminate, the 

 longer ones continue to within seven or eight millimeters of the center of the 

 calix, and abruptly end, leaving a flat, smooth space in the center of the calix 

 fifteen millimeters in diameter. Fossette deep and broad, situated at the mar- 

 gin of the smooth space in the bottom of the cup, and continues to the anterior 

 margin. The exterior is usually rough, with numerous rough wrinkles and 

 strong aunulations of growth. 



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

 the strippings above the different cement quarries, throughout Clark county, 

 Indiana. Now in my collection. 



ZAPHRENTIS IN TORT US, N. Sp. 



Plate 53. Figs. 5, 6. 



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

 point of attachment, regularly expanding in diameter to the calix. Height 

 varying in different examples, from fifty to one hundred and twenty millimeters, 

 or slightly more in matured specimens. Calix broadly campanulate, sixty mil- 

 limeters in diameter. Tabula3 oblique, thin and closely arranged, twenty-five 

 millimeters in diameter. Number of lamellae one hundred and twenty-eight, 

 in the circumference of a calix sixty millimeters in diameter, sharp and unequal 

 in size at the margin, alternating below, the shorter ones continue to the tab- 



