EXPLANATION OF PLATE XXVIII. 



Figure 1. PISIDIUM ABDITUM Hald. Prime, Monog., fig. 72. Enlarged. 

 " 2. PISIDIUM VIRGINICUM Bourg. Prime, Monog., fig. 61. 



Enlarged. 

 " 3. LIMAX MAXIMUS Linne. Shell. Tryon, Mon. Terr. Moll.,. 



pi. xvi, fig. 2. 



" 4. ClRCINARIA CONCAVA Say. 

 " 5. VlTREA DRAPARNALDI Beck. 



" 6. GASTRODONTA DEMISSA Binney. 



" 7. PISIDIUM COMPRESSUM Prime. Monog., fig. 67. Enlarged. 



" 8. LIMAX MAXIMUS Linne. Tryon, Mon. Terr. Moll., pi. xvi, 



fig. 2. 

 " 9. ZONITOIDES ARBOREUS Say. Binney, Man. Am. Land Sh., 



fig. 13. Enlarged. 

 " 10. VITREA HAMMONIS Strom. Binney, Man. Am. Land Sh., 



fig. 21. Enlarged. 

 " 11. VITREA INDENTATA Say. Binney, Man. Am. Land Sh., 



fig. 15. Enlarged. 

 " 12. ZONITOIDES MINUSCULUS Binney. Binney, Man. Am. Land 



Sh., fig. 18. Enlarged. 



" 13. AGRIOLIMAX CAMPESTRIS Binney. Tryon, Mon. Terr- 

 Moll., pi. xvii, figs. 12, 13. 

 " 14. GASTRODONTA LIGERA Say. 

 " 15. OMPHALINA FULIGINOSA Griff. 

 " 16 ZONITOIDES NITIDUS Muller. Binney, Mon. Am. Land Sh., 



fig. 12. Enlarged. 

 " 17. EUCONULUS FULVUS Drap. Binney, Mon. Am. Land Sh., 



fig. 26. Enlarged. 

 " 18. PYRAMIDULA STRIATELLA Anth. Binney, Mon. Am. Land 



Sh., fig. 28. Enlarged. 



" 19. PYRAMIDULA ALTERNATA Say. Juvenile. 

 " 20. PUNCTUM PYGM^EUM Drap. Binn., Man. Am. Land Sh., 



fig. 31. Enlarged. 



" 21. PYRAMIDULA ALTERNATA Say. Albino. 

 " 22. PYRAMIDULA ALTERNATA Say. Eggs. 



" 23. PYRAMIDULA ALTERNATA Say. Variation in height of spire. 

 " 24. PYRAMIDULA ALTERNATA Say. 

 " 25. PYRAMIDULA LINEATA Say. Binney, Man. Am. Land Sh., 



fig. 37. Enlarged. 

 " 26. VALLONIA PULCHELLA Muller. Binney, Man. Am. Land 



Sh., fig. 39. Enlarged. 

 " 27. LIMAX FLAVUS Linne. Tryon, Mon. Terr. Moll., pi. xvi, 



fig. 3. 



All natural diameter, except where otherwise mentioned. 



