A. C. DiMON 



.39 



APPENDIX B. 



Corixhttioii Tiihli:i. TIki olasscs arc lieliiu'il liy \\\v cI.lss iiuiulicrs of tlif Variation »tatistic». 



a. Correlation bctweon Icngth and niunbor of wliorls of sliells of X. olmilda. froui locality 3. 



Lwigth : Ninnbor i>f Whorls : 



Jlean = 5'0983. Mean = 5-8286. 



Standard Deviation = r868. Standard Deviation =r573. 



Correlation = '0040. 

 Total frequency = 35ß. 



Numbcr of Whorls 



b. Correlation between length and number of whorls of sliells of N. tririttatn from locality 3. 



Length : Number of Whorls : 



Mean = 7-879. ' Mean = 9-5548. 



Staudard Deviation = 2-594. Standard Deviation = 2-373. 



Correlation -— 4178. 

 Total frequency = 4.38. 



Number of Whorls 



