EXPLANATION OF PLATE XXIX. 



Figure 1. PYRAMIDULA SOLITARIA Say. 



" 2. POLYGYRA THYROIDES Say. 



" 3. POLYGYRA PENNSYLVANIA Green. 



" 4. POLYGYRA CLAUSA Say. 



5. POLYGYRA EXOLETA Binney. 



" 6. POLYGYRA ALBOLABRIS Say. 



7. POLYGYRA THYROIDES Say. Juvenile. 



" 8. POLYGYRA PROFUNDA Say. Deformed. 



" 9. POLYGYRA HIRSUTA Say. 



" 10. POLYGYRA PROFUNDA Say. 



" 11. POLYGYRA PROFUNDA Say. Juvenile and adult. 



All natural diameter. 



