INDIANA PALEONTOLOGY. m. 



Found in the Warsaw division of the St. Louis group (sub-carb.) at Sper- 

 gen Hill, Washington county, and at Georgetown, Floyd county, and at Lanes- 

 ville, Harrison county, Indiana. The specimens illustrated are in my collection. 



ZAPHRENTIS CASSEDAYI. Milne Edwards. 



Plate 52. Figs. 12, 13, U, 15, 16, 17, 18. 



Zaphrentis Cassedayi, Milne Edwards, Histoire Naturelle Des Coralliaires, page 341, plate 

 61, figure 2 a, 2 b, 2 e. / S"^^ O 



Zaphrentis Calcariformis, Hall, Thirty-fifth Annual Keport of the New York State Museum 

 of Natural History, p 33, 1882. 



Zaphrentis Calcariformis, Hall, Indiana Greologieal Report, page 293, plate 21, figures 10, 

 11, 1882. 



Zaphrentis Calcariformis, HaU, Worthen, (geological Survey, Illinois, volume VIII, page 

 74, plate 10, figures 2, 2 a, 1890. 



Zaphrentis Spergenensis, Worthen, Geological Survey of Illinois, volume VIII, page 77, 

 plate 10, figures 8, 8 a, 1890. 



Zaphrentis Ulrichi, Worthen, Geological Survey of Illinois, volume VIII, page 76, plate 

 10, figures 10, 10 a, 1890. 



Hall's Description: Corallum simple, narrowly turbinate, regularly 

 curved, diameter of calices in individuals of the same height varying from ten 

 to fifteen millimeters. Height twenty-five millimeters. Exterior with frequent 

 undulations and low rounded annulations. Fossette narrow, very deep, com- 

 mencing at the center and continuing to the posterior margin, the lamellae ex- 

 tends to the margin, coalescing and forming vertical walls. Number of lamellae 

 fifty, alternating in size, at a distance of two millimeters from the margin, 

 the smaller lamellae coalesce with the others. 



Found in the Warsaw division of the St. Louis group (sub-carb.) at Sper- 

 gen Hill, Washington county, and at Georgetown, Floyd county, and at Lanes- 

 ville, Harrison county. Indiana. The specimens illustrated are in my collection. 



ZAPHRENTIS ALVEOLATUS. N. Sp. 



Plate 53. Figs. 1, 2. 



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

 curved, or distorted. Acute at the point of attachment. Gradually, or in some 

 examples rapidly increasing in diameter to the calix. Height varying in differ- 

 ent individuals, from fifty to one hundred millimeters. Calix broad, deep, 

 forty-five millimeters in diameter. Tabula? funnel-shaped. Number of lamellae 

 one hundred and ten, in the circumference of a cup forty-five millimeters in di- 

 ameter, slightly unequal in size at the margin, alternating below, the short ones 

 terminate before reaching the bottom of the calix, the longer ones continue to 

 the margin of the smooth space in the bottom of the calix, and abruptly termi- 



