866 



mr. e. s. kussell — environmental 



Table YII. 



Limpets on Rough Stones. 



[Nov. 26, 



Table YIII. 



Limpets on Smooth Stones 



Table IX. 

 Limpets on Stones partly rough and partly smooth. 



The column headed " Composite type " in Table YIII. requires 

 explanation. Certain shells I came across seemed to be rough 

 above and smooth below, showing that they had been rough 

 during the fii^st few months of their life, and had then become 

 smooth. These I called for convenience " composite," 



The locality where these data weie obtained happened to be 



