— 
FS SO OOS tae Cr SO DS TE 
EXPLANATION OF PLATE XXIX. 
PYRAMIDULA SOLITARIA Say. 
POLYGYRA THYROIDES Say. 
POLYGYRA PENNSYLVANICA Green. 
POLYGYRA CLAUSA Say. 
POLYGYRA EXOLETA Binney. 
POLYGYRA ALBOLABRIS Say. 
POLYGYRA THYROIDES Say. Juvenile. 
POLYGYRA PROFUNDA Say. Deformed. 
POLYGYRA HIRSUTA Say. . 
POLYGYRA PROFUNDA Say. 
POLYGYRA PROFUNDA Say. Juvenile and adult. 
All natural diameter. 
oe 
