PLATE XLVI 



PAGE 



Figs. 1-5. NIDULITES PYRIFOBMIS Bassler 193 



1. A nearly complete example partially embedded in limestone. The 



pyriform shape of the organism is shown. 



2. Surface of same showing the usual aspect of the cups. X 4. 



3. A group of examples on a limestone slab with their interior filled 



with crystalline calcite. 



4. A fractured piece of limestone with cross-sections of this organism. 



5. Weathered rock surface with Nidulites in various positions. 



Ordovician (Mohawkian), Nidulites bed of Chambersburg Is., 

 Strasburg, Virginia. 



396 



