INDIANA PALEONTOLOGY. 34. 



CYSTIPHYLLUM IN\ AGINATUM, N. Sp. 



Plate 13. Fig. 1-2. 



Corallum simple, large and somewhat rugged, turbinate, or elongate tur- 

 l)inate. Straight or irregularly curved, or genieulated. Acute at the point of 

 attachment. Gradually, or in some examples, more rapidly expanding in di 

 ameter to the calix. Height varying in different individuals, from two and one 

 half to seven inches or more. Calix broadly bell-shaped, from thirty to seventy 

 millimeters in diameter. Depth thirty to fifty millimeters, and funnel-shaped. 

 Situated in the calix is one or two, and in some examples three depressions, ap- 

 pearing like fossettes, but occupying different positions in the different 

 corallums. In some cups these depressions are scarcely more than ru- 

 dimentary ; when they are strongly pronounced in the cup, there is a corre- 

 sponding elevation on the exterior of the corallum. Septa numerous, in many 

 places it appears as fine striae, in other places it is more conspicuous, in these 

 places there are fourteen in the space of ten millimeters. Near the margin of the 

 calix, the vesicles are larger than they appear below, in some examples the 

 large cysts are confined to the bottom of the calix, and smaller ones appear near 

 the margin, always confined on the anterior side of the cup. In examples where 

 the margin of the cup is broken away, large vesicles will appear on the broken 

 surface. Exterior somewhat rugged, with numerous annulations, and sharp, 

 shallow constrictions. When decorticated the corallum has the appearance of 

 numerous thin invaginated cups with crenulated margins. 



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

 above the cement rock, at the different quarries, throughout Clark county, 

 Indiana. Now in the eollection of the author. 



HELIOPHYLLUM SHERZERI, N. Sp. 



Plate 13. Figs. 3-4-5-6. 



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

 curved. Acute at the base, or in some examples there is a broad scar at the 

 base of attachment. Height varying in different examples, from thirty to one 

 hundred millimeters. The calix of some are very much contracted, while some 

 others are broadly bell-shaped, varying in different individuals, from ten to 

 twenty-five millimeters in diameter. Depth ten millimeters. In the bottom of 

 the calix there is a flat space occupied by the tabulae, from five to ten millime- 

 ters in diameter. Number of lamellse eighty, equal in size, and sharp at the 

 margin ; alternating below, rapidly, or in some cups more gradually sloping to 



