INDIANA PALEONTOLOGY. 8. 



ZAPHRENTIS ISCHYPUS, N. Sp. 



Plate 4. Figs. 1, 2, 3. 



Corallum simple, turbinate, or elongate turbinate. Straight, regularly, or 

 Bometimes irregularly curved, with a broad scar at the base of attachment, oc- 

 casionally an example is acute at the base. Gradually or sometimes rapidly 

 expanding in diameter to the calix. Exterior with irregular annulations and 

 constrictions, caused by intermittent growth. Height varying in ditferent in- 

 dividuals, from three to five inches, in the longest examples observed. Calix 

 broadly bell-shaped, thirty-five millimeters in diameter. Depth from twenty 

 to thirty-five millimeters, with a flat convex space in the bottom of the calix, 

 occupied by the tabulae, fifteen millimeters in diameter. Number of lamelhe, 

 seventy in the circumference of a calix, thirty-five millimeters in diameter, 

 equal in size and rounded at the margin, alternating below, gradually or some- 

 times rapidly sloping to the bottom of the calix, where the short ones gradually 

 disappear, the longer ones are slightly elevated, becoming thinner as tiiey ap- 

 proach the bottom of the cup, and extend a short distance on the tabula^ and 

 disappear, leaving a smooth convex space in the bottom of the ca'ix, ten or 

 twelve millimeters in diameter. Fossette conspicuous, consists of a deep de- 

 pression at the edge of the smooth space in the bottom of the calix, but does not 

 extend on the side of the coral. 



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

 ana. Now in the collection of the author. 

 • 



ZAPHRENTIS C O M I S, N. Sp. 



Plate 4. Figs. 4, 5, 6. 



Corallum simple, sUb-turbinate, straight, or regularly curved, with a broad 

 ■car at the base of attachment. Height forty millimeters. Gradually, or some- 

 times more rapidly, expanding in diameter to the calix, Calix rather broad, 

 Bomewhat shallow, thirty-five millimeters in diameter. Depth fifteen to twenty 

 millimeters, with rather a smooth and slightly concave space in the bottom of 

 the calix, occupied by the tabuloe, fifteen millimeters in diameter. Number of 

 lamellaj, sixty-four, in a calix thirty-five millimeters in diameter, equal in size, 

 and sharp at the margin, slightly alternating below, gradually or sometimes 

 more rapidly descend to the bottom of the calix. The short ones extend a few 

 millimeters on the tabulae, and abruptly terminate; the longer ones are slightly 

 elevated near the bottom of the calix, and extend a short distance farther on 

 the tabulae, and gradually disappear, leaving a smooth, concave space in the 

 bottom of the calix, ten millimeters in diameter. Fossette consists of a deep 



