The variations and ecological distribution of the snails of the genus Io . TM Of Shell ih 103 lU 123 iU 145 lU IS J 175 165 195 203 2 i n 5 235 2^ 5 2a5 265 V-,-^ 340 Platf fl =nl Width of Shell holston river system 200240220200 leo 160 MO IZO 100 80 .60i i ?•-. n G»upiLGrBup It paI2-lfl ?•• , i / •1 ( Gnx^p 18. 11 , A i/ ?- 1 i \ . \ \ 1 / ^ \ ! » / \ / \ \ ? \ ; // / n // / \\ i ? 7 / \ / 1 \ i I. / / / \ // ^>x jiV \ V\ / / / \ h \ y \ \ V^ // / / t : ••••/ \ \ \ / f / / / ^. ^NlI V, ^. /^ -~; /> • \ *. \ ^^ J .t - 7,5 as M 115 ej I3J WS 135 163 ( rftS 183 203 ?«
The variations and ecological distribution of the snails of the genus Io . TM Of Shell ih 103 lU 123 iU 145 lU IS J 175 165 195 203 2 i n 5 235 2^ 5 2a5 265 V-,-^ 340 Platf fl =nl Width of Shell holston river system 200240220200 leo 160 MO IZO 100 80 .60i i ?•-. n G»upiLGrBup It paI2-lfl ?•• , i / •1 ( Gnx^p 18. 11 , A i/ ?- 1 i \ . \ \ 1 / ^ \ ! » / \ / \ \ ? \ ; // / n // / \\ i ? 7 / \ / 1 \ i I. / / / \ // ^>x jiV \ V\ / / / \ h \ y \ \ V^ // / / t : ••••/ \ \ \ / f / / / ^. ^NlI V, ^. /^ -~; /> • \ *. \ ^^ J .t - 7,5 as M 115 ej I3J WS 135 163 ( rftS 183 203 ?« 215 203 273 2fi3| Width of Shell in mm. sf.^r^^JL 1 PmTE 7 Width of Shellcunw river 1 \ 11t \ 11 G, GrGr, 0- V /> 1 S li / * i 1 \\ f 1 \ \ 1 ?\ \ H1 I J V \ \ \ \ fl \ ;\ w \\ \ i , 1 \\ 1 •^^ > \ / ^ / / / r»^ V, V w \\ / 1 ? 11 \\ Hl \ ..»- / 1 /,- 11 11 t d / 11 / 11 \ \\ -(ft^omJ J L 11 / / 1, , \ ^. * i >^ ^7 1 / / c : rSHiKiN/w« • ?? ^ ? • = »» il. 1 I EXPLANATION TO PLATES 10-13. (Shell Index.) Plattings of quantitative data to show the average degree of globosity of the aperture ofthe shell in terms of the diameter of the shell, the shell index, by groups, throughout the Ten-nessee
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashingtongovtprin
