INDIANA PALAEONTOLOGY. I56. 



BLOTHROPHYLLUM HOUGHTONI. 



Plate 46. Figs. 1, 2, 3, 4. 



Example Cyathophyllum hoaghtoni, Rominger. Fossil Corals, 18*6, Page 104, Plate 36, up- 

 per tier of figures. 



Cyathophyllum houghtoni, Hall. Illustration of Devonian Corals, Plate 30, Figs 1, 2. 1876. 



Coralluai simple, turbinate, or elongate turbinate, or conico-cylindrica'. 

 The point of attachment in some examples are pointed, in some there is a broad 

 scar at the base of attachment, and some have strong, root-like prolongations 

 that serve for attachment and support. Height varying in different individuals, 

 from three to five inches or more. Diameter of calix from twenty-five to forty- 

 five millimeters. Depth ten to twenty-five millimeters. A flat space in the 

 center of the calix occupied by the tabulje, from ten to twenty millimeters, 

 varying in different specimens. Number of lamella;' ninety-four in the cir- 

 cumference of a calix thirty-five millimeters in diameter, rounded and equal in 

 size at the margin, alternating below, the short ones terminate before reaching 

 the bottom of the cup, the longer ones continue a short distance on the tabula; 

 and gradually disappear, leaving a smooth oblique space in the bottom of the 

 calix eight or ten millimeters in diameter. Fossette consists of a deep depres- 

 sion at the margin of the smooth space, but does not extend far on the side of 

 the calix. The epitheca is very thin, and does not conceal the longitudinal stria?. 

 Where the epitheca is weathered away the corallum has the appearance of a 

 series of thin invaginated cups. 



Found in the Upper Devonian (Hamilton group) in the strippings above 

 the cement rock throughout Clark county, Indiana, and in the same horizon at 

 Crab Orchard, Kentucky, and in the Hamilton group at Pavillion Center, Gen- 

 Helsee county. New York, and at Little Traverse Bay, Michigan. The speci- 

 mens illustrated are in my collection. 



ZAPHRENTIS PROLIX US, N. Sp. 



Plate 46. Figs. 5, 6. 



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

 curved. Acute at the point of attachment. Length on anterior side eighty- 

 five millimeters ; length of posterior side thirty-five millimeters. Calix oblique 

 and broadly bell-shaped, and very thin near the margin, forty millimeters in 

 diameter. Depth twenty-five millimeters. Number of lamella^ one hundred 

 and eight, somewhat rounded, and slightly unequal in size at the margin, alter- 

 nating below, gradually sloping to the bottom of the calix where the short ones 

 terminate, the longer ones converge to the center, coalescing, and slightly de- 

 flected when meeting the opposite lamellte, but not elevated or connected. There 



