The variations and ecological distribution of the snails of the genus Io . EXPLANATION TO PLATE 4. (Showing the development of the shell and its spinosity.) HOLSTON RIVER SYSTEM—continued. Figs. 1-13. Lot 94. Group 13. Bluff City, Tenn. Enlarged 1/6. Figs. 14-20. Lot 88. Group 16. Rogersville, Tenn. Enlarged 2/5. Figs. 21-34. Lots 87 and SS. Group 16. Rogersville, Tenn. Natural size. Figs. 35-47. Lot 90. Group 17. Cobb Ford, Tenn. Natural

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin