The variations and ecological distribution of the snails of the genus Io . _ 65 «s .67 .eg-tE!«0LGLQaosiTy \h PekCtNT 75 .75 .77 .79 .6i .9! .«5 ?«. EXPLANATION TO PLATES 14-17. (Height of S])ines.) Plattings of quantitative data to show the average height of spines, by groups, throughoutthe Tennessee River

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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin