An interesting shell-color phase occurs in Helicina orbiculata tropica ’Jan.’ Pfr., a small land snail found in abund ance in northeastern, southern, and central Texas. Pilsbry and Ferris have noted color variations in this species, stating that "some colonies are all white; others are mingled with red or blue shells".
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Cheatum, E. P. and Brooks, Betty Watt
"Color Phases In Helicina Orbiculata Tropica 'Jan' Pfr.,"
Field and Laboratory: Vol. 6
Available at: https://scholar.smu.edu/fieldandlab/vol6/iss1/4