EXPLANATION OF PLATE XXX. 



Figure 1. PHILOMYCUS CAROLINENSIS Binney. Tryon, Mon. Terr. 

 Moll., pi. xvi, fig. 6. 



" 2. POLYGYRA MULTILINEATA Say. 



" 3. POLYGYRA MONODON FRATERNA Say. 



" 4. POLYGYRA MONODON Rackett. 



" 5. POLYGYRA INFLECTA Say. 



" 6. POLYGYRA TRIDENTATA Say 



" 7. POLYGYRA FRAUDULENTA Pilsbry. 



8. BIFIDARIA CONTRACTA Say. Tryon, Mon. Terr. Moll. pi. 



xv, fig. 16. Enlarged. 

 " 9. PUPOIDES MARGINATUS Say. Tryon, Mon. Terr. Moll., pi. 



xv, fig. 10. Enlarged. 

 " 10. BIFIDARIA CORTICARIA Say. Tryon, Mon. Terr. Moll., pi. 



xv, fig. 18. Enlarged. 

 " 11. BIFIDARIA PROCERA Gould. Tryon, Mon. Terr. Moll., pi. 



xv, fig. 17. Enlarged. 

 " 12. BTFIDARIA PENTODON Say. Tryon, Mon. Terr. Moll., pi. xv, 



fig. 5. Enlarged. 

 " 13. VERTIGO OVATA Say. Tryon, Mon. Terr. Moll., pi. xv, fig. 



22. Enlarged. 

 " 14. STROBILOPS LABYRINTHICA Say. Binney, Man. Am. Land 



Sh., fig. 150. Enlarged. 

 " 15. BIFIDARIA ARMIFERA Say. Tryon, Mon., Terr. Moll., pi. 



xv, fig. 15. Enlarged. 

 " 16. VERTIGO MILIUM Gould. Tryon, Mon. Terr. Moll., pi. xv, 



fig. 21. Enlarged. 

 " 17. COCHLICOPA LUBRICA Muller. Tryon, Mon. Terr. Moll., 



pi. xiv, fig. 14. Enlarged. 



" 18. LlMN^EA CAPERATA Say. 



" 19. LlMN^A CAPERATA UMBILICATA Adams. 



" 20. LlMNyEA DESIDIOSA Say. 



" 21. LiMNvEA HUMILIS Say. Haldeman, Mon., pi. xiii, figs. 4, 5. 



A little enlarged. 

 " 22. SUCCINEA OVALIS Say. 

 " 23. SUCCINEA OVALIS near TOTTENIANA Lea. 

 " 24. SUCCINEA RETUSA Lea. 

 " 25. SUCCINEA AVARA Say. 



" 26. LlMN/EA COLUMELLA Say. 



" 27. LlMN/EA CATASCOPIUM PINGUIS Say. 



" 28. PLANORBIS TRUNCATUS Miles. 



" 29. ANCYLUS RIVULARIS Say. Haldeman, Mon., pi. i, fig. 1. En- 

 larged. 



" 30. ANCYLUS TARDUS Say. Haldeman, Mon., pi. i, fig. 3. En- 

 larged. Outline figures are lateral views. 



" 31. VALVATA SINCERA Say. Haldeman, Mon., pi. i, figs. 7,8. 



" 32. SEGMENTINA ARMIGERA Say. Haldeman, Mon., pi. iv, figs. 

 12, 13. 



" 33. POMATIOPSIS LAPIDARIA Say. Haldeman, Mon., pi. i, fig. 10. 



" 34. BYTHINIA TENTACULATA Linne. 



" 35. AMNICOLA LIMOSA Say. 

 All figures natural diameter except where otherwise mentioned. 



