204 



NEW YORK STATE MUSEUM 



Streptelasma radicans Hall. 28tli rep't N. Y. state mus. nat. 

 hist. 1876. p. 106, pi. 5, fig. 1-4. 



Petraia waynensis Safford. Geol. of Tennessee. 1869. p. 314. 



u 



12 



15 



Fig. 11 Enter olasma strictum {Ball). A natural longitudinal 

 section showing the pseudocolumella, the papillated carinae on 

 the sides of the septa, and the ascending tabulae, enlarged 



12 An enlargement from the center of the calyx, showing the in- 



volved processes from the inner margins of the septa 



13 Ente r olasma way nense (S afford). A longitudinal section 



showing the subcystose tabulae and pseudocolumella; the upper 

 portion showing the papillate carinae of the septa, enlarged 



14 A transverse section shoAving the thickened walls and the crenula- 



tions caused by the septal carinae, enlarged 



15 A transverse section, showing an Individual growing from the 



calyx of another, enlarged 



Corallum moderately small, cylindrico-conical, usually straiglit, 

 but sometimes slightly curved; calyx circular, moderately deep, 



