INDIANA PALAEONTOLOGY. lo. 



millimeters in diameter, alternating in length, sub-equal at the margin, growing 

 thinner below; the short ones continuing to the flat space in the bottom of the 

 cup and gradually disappears, the longer ones continues to the base of the 

 convex cone in the center of the ealix, and abruptly terminate. No fossette 

 visible in any of the examples examined. 



• Found in the Warsaw division of the St. Louis group (Sub-carboniferous) 

 at Georgetown, Floyd County, and at Lanesville, Harrison County, Indiana. 

 Now in the collection of the author. 



BLOTHROPHYLLUM CINGL LATUM, N. Sp. 



Plate 4. Figs. 11, 12, 13. 



Corallum simple, or composite, elongate turbinate, or sub-cylindrical, 

 straight, or flexuous, increase by calicular gemmation. Acute at the base of 

 attachment, gradually increasing in diameter to the calix. Height varying in 

 different individuals, from thirty to eight}' millimeters or more. Exterior with 

 somewhat coarse irregular annulations and constriction, caused by intermit- 

 tent growth ; when decorticated, they have the decided appearance of a Helio- 

 phyllum. Calix broadly bell-shaped, fifteen to twenty-five millimeters in di- 

 ameter. Depth fifteen millimeters. A smooth convex space in the bottom of 

 the calix, occupied by the tabula?, ten millimeters in diameter. Number of la- 

 mella? seventy-four in the circumference of a calix, twenty-five miilimeters in 

 diameter, alternating in length, rounded, and unequal in size at the margin: 

 the short ones continue#a short distance from the margin, becomes thinner, and 

 gradually disappears before reaching the flat space in the bottom of the cup ; 

 the longer ones are slightly elevated and thinner, and continuous to the smooth 

 convex space in the bottom of the calix and abruptly terminate. Fossette ob- 

 scure, in a great many examples examined only a faint impression of a fossette 

 is shown, on the side of the longest curviture of the coral. 



Found in the Middle Devonian, (Upper Helderburg group) Falls of the 

 Ohio. Now in the collection of the author. 



BLOTHROPHYLLUM FL E X O S U M. N. Sp. 



Plate 5. Ftg. 6, 7, 8. 



Corallum simple, turbinate, or elongate turbinate, gradually, or irregularly 

 curved, or distorted. Acute at the base of attachment. Gradually, or at times 

 rapidly increasing in diameter to the calix. Height varying in different indi- 

 viduals from forty to eighty millimeters. Calix broad, funnel-shaped, from 

 fifteen to twenty millimeters in diameter. Depth ten to fifteen millimeters. 

 Number of lamella? sixty in the circumference of a calix, twenty millimeters in 



