Gould, A.A. 1855. New species of land and fresh-water shells from western (N.) America [continued]. Proceedings of the Boston Society of Natural History 5: 228-229. Available electronically.

Gould, 1855. Proc. Boston Soc. Nat. Hist. 5: 228.
Type(s): LECTOTYPE USNM_84966, Llanos R. Texas.

Gould, 1855. Proc. Boston Soc. Nat. Hist. 5: 229.
Type(s): LECTOTYPE BMNH_196465 (by R.I. Johnson, 1964: 88), Comanche Creek, Texas.

Gould, 1855. Proc. Boston Soc. Nat. Hist. 5: 229.
Type(s): LECTOTYPE MCZ_169447 (by R.I. Johnson, 1964: 108), Chihuahua, 60 mi from Camp Ringgold, Mexico.
Gould, 1855. Proc. Boston Soc. Nat. Hist. 5: 229.

Gould, 1855. Proc. Boston Soc. Nat. Hist. 5: 228.
Type(s): HOLOTYPE MCZ_169291, Llanos River, Texas.