NEW GENERA OF PALEOZOIC RUGOSE CORALS 221 



HoMALOPHYLLUM, gen. nov. 



Type: Zaphrentis ungula Rominger, Fossil corals. 1876. p. 

 151. Onondaga limestone. 



Example: Zaphrentis lierzeri Hall. Fossil corals Niagara and 

 Up. Held, groups. 1882. p. 35. 



The above species have a decided characteristic in that they 

 are flattened on the side of the greatest curvature; for some dis- 

 tance from the apex they are concave; calyx oval, with one side 

 straighter than the opposite side. The form of the corallum is 

 similar to that of a 1 c e o 1 a. They make a natural gronp 

 which differs from Zaphrentis and should be removed from 

 that genus. 



Edaphophyllum, grni. nov. 



Type: Gystiphyllum Mpartitum Hall. Onondaga limestone. 



In form and general appearance similar to Coleophyllum, 

 though the calyx is much less oblique. The conspicuous septal 

 x)f that genus is replaced by an abnormally developed cardinal 

 septum, which is here the most conspicuous feature. 



Internally the structure consists of a series of laminae usually 

 separated by cysts. It also resembles that of Coleophyl- 

 1 u m, but the cysts are more highly developed. 



Etymology of generic terms 



Cbaractophyllum. Mpaxro^^ toothed, saw edge, and (J'uXXovy 

 a leaf, in allusion to the serrated margins of the septa. 



C y 1 i n d r o p h y 1 1 u m. KbXivdpo'$^ a cylinder, and (poXXov^ a leaf, 

 in allusion to the form of the corallites. 



Ditoecholasma zlc-, double, ror/jj^^ a wall, and (pbXXov^ a leaf, in 

 allusion to the outer and inner walls. 



Edaphophyllum. "Edacpoz^ a base, foundation, and (pbXXov^ a 

 leaf, in allusion to the laminate base of the calyx. 



Enterolas ma. "Ewepov, intestine, and ^'EXaff/ia, a plate, in allu- 

 sion to the convoluted center of the coral. 



H a p s i p li y 1 1 u m. '^^c'c, an arch, and (pbXXov, a leaf, in allusion 

 to the arched accessory wall. 



Homalophyllum. ' 'OpdXoc, level, and (puXXw^, a leaf, in allusion 

 to the flattened portion of the coral. 



