Occasional Papers of the Museum of Zoology 101 



Altitude 17.4 18.8 19.8 20.8 21.8 22.8 25.1 



B. Variation by Major Diameter Class 

 Whorl Class (by half -whorls) 



44 The columns of figures in the central portions of the subtables give 

 the number of individuals which fall into each category. 



