NEW GENERA OF PALEOZOIC RUGOSE CORALS 



201 



interspace; the septa of a pair separated by only a narrow inter- 

 space, and having somewhat the appearance of a single septum 

 wdth double walls; tabulae numerous, subcystose; dissepiments 

 infrequent or obsolete. 



The pseudocolumella has very much the appearance of that of 

 Enter olasma, but the very different and peculiar arrange- 

 ment of the septa easily distinguishes it from that species. 



Fig. 5 Ditoecholasma fanningannm (Safford). A transverse 

 section, showing the peculiar arrangement of the septa, enlarged 

 6 A longitudinal section showing the pseudocolumella and tabulae, 

 enlarged 



Laccophyllum, ge)i. nov. 



Type: Laccophyllum acuminatum, sp. nov. Niagaran group, 

 Perry co. Tenn. 



Coralluni small, simple, cylindrico-conical, sometimes slightly 

 curved; septa strong, alternating in size, the larger ones continu- 

 ing to within a short distance of the center, where their ex- 

 tremities become broadened and fused, forming a distinct inner 

 wall, leaving a cylindric central space, the smaller septa, at about 

 one third the distance to- the center, coalescing with the larger 

 ones; tabulae present, those of the inner space strong, horizontal; 

 of the peripheral space, much thinner and ascending from the 

 outer to the inner wall, sometimes subcystose. 



