INDIANA PALEONTOLOGY. no, 



H E L I O P H Y L L U M M I R U M , N. Sp. 



Plate 84. Fn;s. 1, '2. 



Coralluni s^iiuple, txirbinate, straight or curved. Attenuate at the ba.se of 

 atttaehment, rapidly expanding in diameter to the calix. Exterior 

 wvith gentle undulations and wrinkles, caused by intermittent growth. Length 

 «»f coraHum on anterior side eighty millimeters: on the posterior side twenty- 

 iive millimeters. Calix oblique and broadly camj/anulate, fifty millimeters in 

 <liameter. Depth fifteen millimeters. A tlat space in the bottom of the calix 

 occupied bj' the tabuhe, fifteen millimeters in diameter. Number of lameihe 

 one hundred and fifty in the circumference of a calix fifty millimeters in diame- 

 ter, alternating in length, unequal in size at the margin, the short ones con- 

 tinue for ten or fifteen millimeters, and coalesce with the longer ones, or disap- 

 pear, the longer ones are slightly elevated, sharp, and gradually slope to the 

 tlat space in the bottom of the calix, and abruptly terminate. Fossette conspic- 

 uous, consists of a deep groove commencing at the margin of the flat space in 

 the bottom of the calix. and continuing to the anterior margin. Denticulations 

 •obsc\!re, due to the weathered condition of the corallum, but in well preserved 

 •examples they are elevated and sharp, and about one millimeter apart. 



Found in the Upper Devonian (Hamilton group) two miles north-west of 

 •( -harlestown. Indiana. Now in the collection of the author. 



H E L 1 O P H Y L L U M D I S P A N S U M , N. Sp. 



Platk 84. Figs. 8, 4. 



( 'orallum simple, turbinate, straight or curved. Attenuate at the base of 

 attachment, rapidly expanding in diameter to the calix. Exterior 

 surface with annulations and wrinkles caused by intermittent growth. Length 

 of corallum seventy millimeters on the anterior side, thirty-five millimeters on 

 the pttsterior side. Calix broadh' cauipanulate. forty-five millimeters in diame- 

 ter. Depth fifteen millimeters. A flat space in the bottom of the calix, occu- 

 pied l>v the tabuhe, fifteen millimeters in diameter. Number of lamelhe, one 

 hundred and fifty, in the circumference of a calix forty-five millimeters in di- 

 <imeter, alternating in length, equal in size at the margin, gradually sloping to 

 the flat space in the bottom of the calix, where the short ones terminate, the 

 longer ones continuing to the center, twisting, and slightly elevated. F(»ssette 

 •cttnspieuous, consists of a deep groove commencing at the b<»ttom of the calix. 

 and continuing to the anterior margin. Denticulations on preserved portions of 

 the lamella^ well defined, much finer than in the former species. 



F<tund in the Upper Devonian (Hamilton group) two miles north-west of 

 <'harlestown, Indiana. Now in the collection of the author. 



