INDIANA PAL.CONTOLOGY. 98. 



E R I D O P H Y L L L M L O U I S V I L L p: N S I S , N. Sp. 



Plate 31. Fig. 1. 



Corallum composite, rapidly increasing by calieular gemmation. Corallites 

 more or less distant, from two to five or more millimeters apart. Attached by 

 strong root-like processes growing from their sides. Tubes rounded, unecjiial 

 in size, from five to fifteen millimeters in diameter. The entire corallum does 

 not exceed forty millimeters in height, and eighty millimeters in diameter. 

 Number of lamellte seventy, in a calix fifteen millimeters in diameter, uniform 

 in size, and slightly rounded at the margin, alternating below, for two or three 

 millimeters from the margin flat, or slightly oval, then abruptly slope to the 

 bottom of the calix, where the short ones terminate, the longer ones continue, 

 coalescing with the adjacent primary- ones, and fasciculating and twisting into 

 a small prominence in the center of the calix. No fossette observed in any of 

 the cups. 



Found in the Upper Silurian (Niagara grf»up) at the Work House Quarry, 

 Beargrass Creek, near Louisville, Kentucky-, now in the collection of the author. 



DIPHYPHYLLUM BILLING SI, N. Sp. 



Plate 8L Fig. 2, 8. 



Corallum composite, rapidly increasing by calieular and lateral gemmation. 

 Stems rounded, unequal in size, five to fifteen millimeters in diameter. Exter- 

 ior of corallites with numerous annulations and sharp constrictions, giving to 

 the stems the appearance of a number of thin invaginated cups. Height vary- 

 ing from twenty to fortj^ millimeters. Diameter of calix. from five to fifteen 

 millimeters. Depth five millimeters. Situated in the center of the. calix is a 

 smooth convex area, inclosed in a vertical wall, two millimeters in diameter. 

 Number of lamella? sixty, in the circumference of a calix twelve millimeters in 

 diameter, equal in size at the margin, alternating below, gradually sloping to 

 the bottom of the calix, where the short ones abruptly end, the longer ones con- 

 tinue to the vertical wall in the center of the calix, and terminate. Denticula- 

 tions appear as small granules. Fossette consists of a small groove, commenc- 

 ing at the edge of the vertical wall and continuing to the margin of the calix. 



The short, rapidly increasing corallites, and the invaginated appearance of 

 the stems, makes this easily recognized from all other species. 



The specific name is in honor of Mr. Walter R. Billings, of Ottawa, Canada. 



Found in the Upper Silurian (Niagara group) at the Work House Quarry, 

 on Beargrass Creek, near Louisville, Kentucky, now in the collection of the au- 

 thor. 



