139. CONTRIBUTION TO 



HELIOPHYLLUM CONVERGENS 



Plate 40. FigsT 8, 9, 10, 11, 12, 13. 



Aulaeophyllum Convergens, Hall. Thirty-fifth annual report of the New York State Mus- 

 eum of Natural History, advance sheets, i>age 22, August, 1862. 



Aulaeophyllum Convergens, Hall. Indiana Geological report, page 281, plate 17, figures 1 



and 2, 1882. 



Hall's Description: Corallum simple, broadly sub-turbinate, regularly 

 curved. Exterior eomparitively smooth with concentric wrinkles and stria- 

 tions ; longitudinal stride fine, distinct; specimens of the same height have a 

 diameter at the calix varying from twenty-five tO' forty-five millimeters; in one 

 example the height is ten millimeters ; length of posterior side, twelve milli- 

 meters; of anterior side, twenty-five millimeters; diameter of calix, twenty 

 millimeters, for a distance of five millimeters from the margin nearly flat, then 

 the posterior portion is nearly vertiele, the anterior portion concave; fossette 

 narrow, deep, extending from the bottom of the calix to the anterior margin; 

 lamella3 varying from 80 to 120 in number according to the diameter of the ca- 

 lix, alternating in size, thin denticulated ; convergence of lamella3 to the fos- 

 sette very distinct. 



Formation and locality, corniferous limestone. Falls of the Ohio, and 

 Clark county, Indiana. 



This is misleading, this species is not found in the corniferous group at 

 the Falls of the Ohio, but is found in the Upper Devonian (Hamilton group) 

 near Charlestown, and in the strippings above the cement rock, throughout. 

 Clark countf, Indiana. All the specimens illustrated on plate 40 are in my 

 collection. 



HELIOPHYLLUM ZENKERI 



Plate 40. Figs. 14, 15, 16, 17, 18. 



Cyathophyllum Zenkeri, Billings, Canadian Journal, new series, volume 5, page 262, 1860. 

 Cyathophyllum Zenkeri, Nicholson, Pala&ontology of Ontario, page 76, 1875. 

 Cyathophyllum Zenkeri, Lambe, Contribution to Canadian Palaeontology, volume 4, part 2,. 

 plate 12, page 138, 1900. 



Corallum simple, turbinate, regularly curved, with blunt points of attach- 

 ment. Height varying in different individuals, from twenty millimeters to four 

 inches or slightly more. Calix oval, oblique, broadly bell-shaped, from fifteen 

 to fifty millimeters in diameter. Depth from fifteen to twenty-five millimeters. 

 Number of lamellae, one hundred and thirty, in the circumference of a calix^ 



