CLASSES, ORDERS, ETC. 93 



{a) Shell light brown, attenuated, glossy, strongly striated in 

 line of growth ; whorls six to seven ; suture well defined ; mouth 

 pyriform, contracted above ; umbilicus minute. Height Tf^ths 

 inch. Under stones and among decaying leaves. Moderately 

 common, but local. A. lineata.^^ 



^' V. alba, white or colourless, transparent ; m. sinistrorstim, spire sinistral. 



