INDIANA PALEONTOLOGY. 25. 



lamella? sixty, in thecircumference of a cup, thirteen millimeters in diameter, al- 

 ternating in length, nearly equal in size at the margin, abruptly sloping to the 

 bottom of the calix, where the short ones terminate, the longer ones beeome ele- 

 vated, sharp, and continue on the bottom, coalescing and fasciculating. and is ele- 

 vated into a sharp cone, from three to five millimeters in height. No fossette. 

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

 ana. Now in the collection of the author. 



B L O T H R O P H Y L L U M I N C U L T U M, N. Sp. 



Plate 9, Figs. 9-10. 



Corallum simple, turbinate, or elongate turbinate. Straight, or regular- 

 ly curved. Acute at the base of attachment. Gradually and regularly 

 enlarging in diameter to the calix. Height, varying in different individuals, 

 from forty-five to seventy-five millimeters. Calix broad, bell-shaped, twenty to 

 twenty-five millimeters in diameter. Depth ten to fifteen millimeters. A flat 

 convex space in the bottom of the calix, occupied by the tabulae, ten or twelve 

 millimeters in diameter. Number of lamellfe seventy, in the circumference of a 

 cup, twenty millimeters in diameter, unequal in size, and slightly rounded at 

 the margin, alternating below, gradually, or in some examples, rapidly sloping 

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

 ones continue ou the tabulie, to the center of the calix, coalescing, and slightly 

 twisting, and terminate; not elevated. Exterior, with numerous, round- 

 ed annulations, and sharp constrictions, and when decorticated the sur- 

 face is covered with broad, shallow vesicles, and the numerous, sharp constric- 

 tions, gives to the corallum, the appearance of a series of thin invaginated ca- 

 lices. Fossette conspicuous; it consists of a deep, narrow pit. situated at the 

 anterior margin of the tabulse, but does not extend far on the side of the calix. 



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. 



D I P H Y P H Y L L U M E X P A N S U M, N. Sp. 



Plate 9, Fig. 11. 



Corallum compound, increasing by lateral gemmation, corallites rarely in 

 contact. Exterior with gentle undulations, and wrinkles, caused by periodical 

 growth. Longitudinal striie distinct. Height twenty millimeters. Diameter of 

 corallites. varying, from ten to twenty millimeters. Depth fifteen millimeters. 

 Number of lamellae, from sixty to seventy, uniform in size at the margin, alter- 

 nating in length, the short ones end abruptly, on reaching the bottom of the 

 calix. the longer ones become elevated, and continues to the vertical wall of the 

 internal area. Internal area smooth, three millimeters in diameter. Fossette 

 obscure. Denticulations fine, eight in the space of five millimeters. 



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

 the Ohio. Now in the collection of the author. 



