Pupa elimia
The pupa elimia (Elimia pupaeformis) was a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species was endemic to the United States; it is now extinct. References 

Elimia
Extinct gastropods
Gastropods described in 1864
Taxonomy articles created by Polbot
Taxa named by Isaac Lea