NEW GENEiRA OF PALEOZOIC RUGOSE CORALS 



209 



thors say the pseudocolumella is formed by " the amalgamation 

 of the inner ends of a larger or smaller number of septa, without 

 any twisting of the septa, and being accompanied by a more or 

 less copious secondary deposition of sclerenchyma." 



In Kionelasma the twisting of the septa is one of the 

 most pronounced characteristics. 



Triplophyllum, gen. nov. 



Type: Zaphrentis terehrata Hall. 12th rep't, geol. Indiana. 

 1883. p. 316, pi. 23, fig. 5. Onondaga limestone, Falls of the 

 Ohio. 



Example: Zaphrentis centralis Edwards and Haime. Mono- 

 graphie des polypiers fossiles des terrains palaeozoiques. p. 328, 

 pi. 3, fig. 6. 



This genus has the same general appearance and mode of 

 growth as Zaphrentis, but in addition to the septal fovea 

 there are two lateral foveae. The microscopic character is also 

 different. In Zaphrentis the calcareous fibers of the septa 

 are arranged obliquely outward from the median plate: in this 

 genus they are arranged obliquely inward or toward the center of 

 the corallum. 



Fig". 26-37 Triplophyllum d a 1 i i {E. and H.). Transverse -sec- 

 tions of two specimens showing the three septal foveae and 

 the arrangement of the septa 



Charactophyllum, gen. nov. 



Type: Camptopliyllum nanum Hall and Whitfield. 23d ann. 

 rep't N. Y. state mus. nat. hist. 1873. p. 232. Lower Carbonic 

 Rockford Ind. 



