INDIANA PALEONTOLOGY. \u. 



ZAPHRENTIS STRIGATUS, N. Sp. 

 Plate 52. Figs. 1, 2, 3. 



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

 point of attachment. Rapidly expanding in diameter to the calix. Height vary- 

 ing in different individuals, from thirty to fifty millimeters, the longest exam- 

 ples observed. Calix oblique, broadly campariulate, thirty millimeters in diam- 

 eter. Depth ten to fifteen millimeters. A deep, broad, concave space in the 

 center of the calix, occupied by the tabulae, from five to eight millimeters deep, 

 and ten millimeters broad. Number of lamellje, one hundred and twelve in the 

 circumference of a calix thirty millimeters in diameter, the short ones merely 

 rudimentary, the longer ones gradually slope to the margin of the concave area, 

 and abruptly terminate. Fossette consists of a deep depression in the center of 

 the concave space, and continues as a deep broad groove to the anterior mar- 

 gin. Situated in the center of the fossette is one large lamella?, commenc- 

 ing in the bottom of the calix, and continues to the anterior margin. 



The broad, deep concave space, and the long lamellae, situated in the fos- 

 sette, makes this easily recognized from all other species. 



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

 the different cement quarries throughout Clark county, Indiana. Now in the 

 collection of the author. 



ZAPHRENTIS INVAGINATUS, N. Sp. 



Plate 52. Figs. 4, 5. 



Corallum, simple, turbinate or elongate turbinate, straight or regularly 

 curved. Acute at the point of attachment. Gradually enlarging in diameter 

 to the calix. Height varying in different individuals from fifty to eighty-five 

 millimeters. Diameter of calix twenty-five millimeters. Depth fifteen milli- 

 meters, with a smooth oblique space in the bottom of the calix occupied by the 

 tabulae, fifteen millimeters in diameter. Number of lamellae seventy in the cir- 

 cumference of a calix twenty-five millimeters in diameter, equal in size and 

 slightly rounded at the margin, alternating below, rapidly sloping to the 

 bottom of the calix where the short ones gradually terminate, the longer ones 

 continue a short distance on the tabulae and abruptly end, leaving a smooth, 

 oblique space in the center of the calix, from six to ten millimeters in diameter. 

 Fossette consists of a slight depression in the center of the calix, gets deeper 

 and broader as it approaches the posterior side of the cup, but does not extend 

 on the side of the calix. Exterior with numerous shallow annulations and 

 wrinkles caused by intermittent growth. 



