NEW GENERA OF PALEOZOIC RUGOSE CORALS 



217 



sembles Cylindrophyllum elongatum. The manner 

 of growth is similar, both consisting of an aggregation of elon- 

 gate, cylindric stems, but in that species there are numerous 

 cysts as well as tabulae, the structure being heliophylloid. From 

 the other forms, which consist of an aggregation of cylindric 

 stems, specially some forms ofSynaptophyllum to which 

 it has a resemblance, it may always be distinguished by its in- 

 ternal structure. 



Cylindrophyllum, gen. nov. 



Type: Cylindrophyllum elongation sp. nov. Onondaga lime- 

 stone. 

 Colonies forming masses composed of loosely aggregated, very 



42 





Fig. 42 Cylindrophyllum e 1 o ii g a t ii m 

 tudinal section showing internal structure 



sp. nov. A longi- 



elongate, cylindric stems, in the tyi)e species having a diameter 

 of from 12 to 14 mm; distance between the corallites variable; 



