148 Bryant Walker 



HoRATiA MiCRA NUGAX (Pils'bry and Ferriss). 



Valvata micra nugax Pilsbry and Ferriss, Pr. A. N. S. P., 1906, p. 173, pi. 



IX, fig. 6. ; 



Horatia (Hauffenia) micra nugax Pils'bry, Naut., XXX, 1916, p. 83. 

 Type locality : Guadalupe River, New Braunfels, Texas. 



Subfamily POMATIOPSIN^ Stimpson, 1865. 

 Genus POMATIOPSIS Tryon, 1862. 



PoMATiOPSis BiNNEYi Tryon. 



Pomatiopsis binneyi Tryon, Pr. A. N. S. P., 1863, p. 148, pi. I, fig. 10. 

 Bythinella binneyi W. G. Binney, L. and F. W. Shells, III, 1865, p. 69, figs. 

 136-137. 

 This species is a true Pomatiopsis according to Pilsbry (96, p. 123). 



Pomatiopsis caufornica Pilsbry. 



Pomatiopsis californica Pilsbry, Naut., XII, 1899, p. 126. 

 Type locality: San Francisco, Cal. 



Pomatiopsis cincinnatiknsis (Lea). 



Cyclostoma Cincinnati ensis Lea, Pr. Am. Phil. Soc, I, 1840, p. 289. 

 Amnicola sayana "Anthony" Haldeman, Mon., 1844, p. 19, pi. I, fig. 11. 



This species having proved to be a Pomatiopsis, Lea's name takes pre- 

 cedence over that of Anthony which was proposed on the supposition that 

 the species was an Amnicola. 



Baker (4, p. 343) has erroneously attributed the species to Anthony and 

 his description, figures and sjmonymy are those of Amnicola Cincinnati ensis 

 Anth. 



Pomatiopsis hinklKyi Pilsbry, Naut., X, 1896, p. 37. 

 Type locality : Black Falls, Florence, Ala. 



Pomatiopsis i,apidaria (Say). 



Palndina lustrica Say, quoted as Amnicola lustrica by Haldeman and 

 authors generally and as Pomatiopsis lustrica by Binney according to Pils- 

 bry (89, p. 53) is the young of this species. 



Pomatiopsis robusta Walker. 



Pomatiopsis robusta Walker, Naut., XXI, 1908, p. 97, text-fig. 



Type locality: Jackson Lake, Wyo. 



