Shells of the species described here compared to shells of similar species in the region. All localities are in Texas A Vitropyrgus lillianae gen. et sp. nov. Comal Springs, Comal County B Stygopyrgus bartonensis, Barton Springs, Travis County C Phreatodrobia imitata, Verstræten Well, Bexar County D Pyrgophorus spinosus juvenile, San Marcos River, near Martindale, Guadalupe/Caldwell County Line E Phreatodrobia bulla sp. nov. PC Spring, Williamson County.