. MONOGRAPH XvVIIl PLATE XxXill 
U. S. GEOLOGICAL SURVEY - 
] 
TURBINELLIDA, VOLUTIDA, PLEUROTOMIDA, STROMBIDA, TURRITELLIDA, PLEUROTOMARIIDA, AND BULLIDA. FROM THE BASE OF 
THE UPPER BED GREENSAND MARLS. 
Tui f 
