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JOURNAL OF CONCHOLOGY, VOL. I4, NO. lO, APRIL, I915. 



comparison is one of considerable delicacy.^ Relatively speaking the 

 Banstead shells are flatter, the Bicknor most closely coiled (the 



difference being in the arrangement of the apex), while the Marple 

 specimens have the most rapidly expanding last whorl (/>., the 

 difference between major and minor diameter is greater). 



I In illustration of the results a series oi eel/aria from Banstead 7-8'9 mm. in diameter give 

 100, 88, 48, 32, with 4'7 whorls: the figures bring out the relative flatness oi cdlaria clearly 

 enough. 



