Ceratodictya oryx sp. nov. 

 (Page 180) 

 Figure i. The shorter but better preserved specimen of this 

 genus, showing the grooved annulations which are generally char- 

 acteristic of Ceratodictya. 



Figure 2. The longer of the specimens, but poorly preserved. 

 Both are casts from natural molds. 

 Chemung group, 6 miles southeast of Erie, Pa. 



. [190] 



