INDIANA PALEONTOLOGY. I4. 



of attachment, gradually expanding to the calix. Diameter of calix varying in 

 different individuals from twenty-five to forty millimeters. Number of lamellae 

 eighteen in the space of ten millimeters, alternating in length, slightly unequal 

 in size, and rounded at the margin, growing thinner below, for about five milli- 

 meters from the margin nearly flat, then abruptly sloping to the bottom of the 

 calix, where the short ones terminate, the longer ones continuing to the center, 

 where a few intimately connect, and in some cups they are slightly twisted, and 

 elevated into a false calumella, one or two millimeters or more in height. Fos- 

 sette consists of a deep depression in the bottom of the calix, but does not ex- 

 tend but a short distance on the side of the cup. Denticulatious fine, ten in 

 the space of six millimeters. 



The specific name is in honor of Prof. W. W. Borden, of Borden Institute, 

 Borden, Indiana. 



Found in the Upper Devonian, (Hamilton group) near Charlestown, Indi- 

 ana. Now in the collection of the author. 



HELIOPHYLLUM AG AS S IZ I, N. Sp. 



Plate 5. Fig. 1. 



Corallum simple, or compound. Increasing by calicular gemmation. Par- 

 ent cup usually very m ch smaller than the increasing corallites, rarely exceeds 

 one and one-half inches in diameter. Height about equal to the diameter of 

 the calix. While the increasing corallites have a length from two and one-half 

 to seven and one-half inches. Calix broad, bell-shaped, from sixty to eighty 

 millimeters in diameter, varying in different individuals. Depth twenty milli- 

 meters. A flat space in the bottom of the calix, occupied by the tabuhi^, twenty 

 millimeters in diameter. Number of lamellte eighty, in the circumference of a 

 calix, eighty millimeters in diameter, somewhat thick, and equal in size at the 

 margin, alternating in length, for ten or fifteen millimeters from the margin, 

 flat, then abruptly slope to the bottom of the calix, where the short ones abruptly 

 end, the longer ones continues, for six or seven millimeters, and abruptly ter- 

 minate, leaving a smooth, slightly oblique space, in the bottom of the calix, from 

 six to eight millimeters in diameter. Fossette consists of a deep depression, at 

 the edge of the smooth, oblique space, in the bottom of the calix, extends a 

 short distance on the side of the coral, and gradually disappears : position vari- 

 able. Denticulatious very coarse, seven or eight, in the space of ten millime- 

 ters. 



Found in the Lower Devonian, (Corniferous group) at the Falls of the Ohio. 

 The specific name, is given in honor of Prof, Alexander Agassiz, of Cambridge 

 University, one who has contributed so largely to the advancement of science. 

 Now in the collection of the author. 



