309 



Physa hawnii Lea. 



Physa hawnii was originally described from Verdigris River, 

 Kansas. Under this name it has seemed to have remained 

 entirely unknown. It has been known best as P. albofilata, a 

 form of the same species from northern Arkansas. F. C. Baker 

 (1928, p. 453) is certainly correct in placing P. albofilata in the 

 synonymy of P. hawnii. They are practically identical in all 

 characters. Physa albofilata was never described. Named by 

 Ancey, then communicated to Sampson, it was distributed as 

 such for many years. The casual remarks about its affinities 

 (Sampson, loc. cit.) cannot be construed as constituting a de- 

 scription. P. hawnii is, however, quite separable from P. 

 gyrina Say and should not be considered a variety of it as listed 

 by Baker. 



1864 Physa hawnii Lea, Proc. Acad. Nat. Sci. Phila. for 1864, 

 p. 115; Journ. Acad. Nat. Sci. Phila. vol. 6, p. 165, 

 pi. 24, fig. 84, 1866; Observations, vol. 2, p. 121, pi. 

 24, fig. 84, 1867. 



1894 Physa albofilata 'Ancey' Sampson, Arkansas Geol. Surv., 

 vol. 2, of Rep. for 18.91, p. 194. 



1901 Physa gyrina albofilata Sampson, Crandall, Nautilus vol. 

 15, p. 54. 



1928 Physella gyrina hawni Lea, Baker, Bull. 70, Wisconsin 

 Geol. Nat, Hist. Surv. pt. 1, p. 453. 



Physa salina, sp. nov. 

 Fig. I ami '2. 



Description. — .Shell .sinistral, imperforate, rather large and elongate, medium 

 heavy. Color, light yellowish brown. Whorls 5, rather flat; body whorl very 

 large, nuclear whorl deep reddish brown and smooth. Spire produced. 

 Aperture elongate-ovate, flaring basically. Palatal lip marginate. Parietal 

 lip of only a thin callous on the body whorl. Columella heavy, twisted, and 

 folded back over the inner side of the lip. Sutures very deeply impressed 

 and sharply indented. Sculpture of very fine cross striae. Axial riblets 

 occasionally produced by the grouping of several very fine axial lines. 



