NEW GENERA OF PALEOZOIC RUGOSE CORALS 



207 



extremity of tlie carina. In a transverse section, curved, spur- 

 like processes are seen proceeding from the sides of the septa. 

 The nature of these processes has not been satisfactorily deter- 

 mined. Tabulae are frequent, delicate; dissepiments frequent. 

 The type species of this genus clos6ly resembles Stereo- 

 lasma rectum, and from external characters alone they 

 could not be separated, but by slightly grinding dovvu the ex- 

 terior, the difference can be at once seen. 



rig. 21 Longitudinal section of the same showing depth of the calyx, 

 pseudocolumella and septal carinae 

 22 Longitudinal section near the margin, showing the edges of the 

 septa and the width of the carinae 



KiONELASMA, gen. nov. 



Type: Streptelasma mammifei'um Hall. 

 Niagara and Upper Held, groups. 1882. 

 N. Y. state mus. nat. hist. 1884. p. 425. 

 Falls of the Ohio. 



Examples: Cyathaxonia gainesi Davis, 

 corals. 1885. pi. 104, fig. 1-7. 



Streptelasma spongaxis Rominger. Geol. sur. Michigan, 

 pt 2, pi. 39. 



Corallum variable in size, cylindrico-conical or horn-shaped; 

 oalyx circular or elliptic; septa alternating in size, the larger 



Fossil . corals of the 

 p. 21, and 35th rep't 

 Onondaga limestone, 



Kentucky fossil 



1876. 



