INDIANA PALEONTOLOGY. 36. 



Height of entire corallum ninety millimeters. Exterior with numerous deep 

 constrictions and wrinkles, caused by intermittent growth. Corallites when 

 decorticated, have the appearance of a number of invaginated cups. Calix 

 broad, bell-shaped, from thirty to thirty-five millimeters in diameter. Depth 

 ten to fifteen millimeters ; a flat space in the bottom of the cups, occupied by 

 the tabulae, from ten to twelve millimeters in diameter. Number of lamellae 

 seventy, in the circumference of a calix thirty millimeters in diameter, rounded 

 and equal in size at the margin, alternating below for about five millimeters 

 flat, then abruptly slope to the bottom of the calix, where the short ones grad- 

 ually disappear. The longer ones continue to within three millimeters of the 

 center of the cup, and abruptly terminate, leaving a smooth convex space in the 

 bottom of the calix, six millimeters in diameter. Denticulations moderately 

 coarse, eight in the space of five millimeters. Fossette consists of a slight de- 

 prtession at the margin of the tabulae, but does not extend on the side of the 

 calix. Position variable. 



The specific name is in honor of Dr. John Lemon, of New Albany, Ind., an 

 ardent collector and a good palaeontologist. 



Found in the lower Devonian (Corniferous group), at the Falls of the Ohio. 

 Now in the collection of the author. 



ZAPHRENTIS GROSBACHI, N. Sp. 



Plate 13. Figs. 9-10-11-12. 



Corallum simple, rather below medium size, turbinate, straight or irregu- 

 larly curved. Acute at the base of attachment, gradually expanding 

 in diameter to the calix. Height varying in different examples, irom fifteen to 

 twenty-five millimeters. Diameter of calix from ten to fifteen millimeters. 

 Depth five to seven millimeters, with a smooth, depressed, convex space in the 

 bottom of the calix, occupied by the tabnlae, from five to seven millimeters in 

 diameter. Exterior rather rough, with coarse annulations and constrictions, 

 caused by intermittent growth. Number of lamellae, fifty-four in the circum- 

 ference of a calix fifteen millimeters in diameter ; unequal in size at the margin, 

 and rather sharp, alternating in length ; the short ones abruptly slope to the 

 bottom of the calix, and gradually disappear ; the longer ones rapidly for a 

 short distance, then gradually slope to the depressed convex space in the bot- 

 tom of the calix, and abruptly terminate, leaving a smooth, depressed convex 

 space in the bottom of the calix, about six millimeters in diameter. No fossette 

 in any of the examples in my collection. 



Found by Mr. Henry Grosbach, of Sellersburg, in whose honor the specific 

 name is given, in the upper Devonian (Hamilton group), near Sellersburg, 

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



