LYROPUPA. 



229> 



Key to species of Lyropupa. 



I. Shell sinistral. 



a 1 . Angular lamella long and high; surface minutely striate 

 spirally (in fresh shells). 

 & 1 . Species of Oahu. 



c 1 . Small, length about 2 mm. or less. 



L. microthauma, no. 2. 



