1906.1 NATURAL SCIENCES OF PHILADELPHIA. 133 



B. dealbatus mooreanus (' W. G. B.,' Pfr.). PI. VI, figs. 1-6. 



Pfr., Monographia Hel. Viv., VI, p. 143 (1868). 



Bulimusschiedeanus in part, W. G. Binnej^, Terr. Moll., IV, p. 129, pi. 80, fig. 8. 

 Bulimulus schiedeanus var. mooreanus W. G. Binnej^, Terr. MoU., V, p. 392, 

 figs. 277, 278; Man. Amer. Land Shells, p. 400, figs. 438, 440. 



The shell is thin, ovate-conic, opaque white above, coffee-with-cream col- 

 ored below the periphery, or sometimes either white or coffee-tinted 

 throughout ; sometimes varied with a few gray streaks, or some scattered 

 translucent-gray dots; surface smooth, with the spire more or less 

 striate, apical whorls waxen or dark. Umbilicus narrow. Interior 

 cream-white. Five specimens from New Braunfels measure: 



Distribution, eastern division of the Lower Sonoran in Texas. 

 Originally described from ' ' Washington and DeWitt counties, Texas. ' ' 

 Specimens from both of these are before us, and also from Hays, 

 Comal, Guadalupe, Bexar, Medina, Frio, Uvalde and Victoria counties. 

 Some shells from Fort Worth and Waco, in northern Texas, are also 

 like mooreanus, while others resemble B. d. liquabilis. 



B. d. mooreanus is smaller, thinner and smoother than the Mexican 

 B. schiedeanus (Pfr.), but intergrades with B. d. liquabilis Rve. through 

 certain specimens having ragged dark streaks, chiefly on the spire, 

 such as fig. 5 of pi. VI. In the main, the subspecies is quite uniform 



