1906.] NATURAL SCIENCES OF PHILADELPHIA. 147 



Vertigo ovata Say. 



Benson, Arizona: Drift of Devil's river, Val Verde county, Texas. 

 Vertigo binneyana Sterki. 



Benson, Arizona (Ferriss). 

 Vertigo oscariana Sterki. 



Drift debris of the Guadalupe river, about four miles above New 

 Braunfels, Texas, a single specimen, a little larger and stronger than 

 Eastern (Austroriparian) examples. 

 Vertigo milium Old. 



San Marcos, Hays county; Guadalupe river above New Braunfels, 

 Comal county, and on the Hondo river, Medina county, Texas, in 

 flood debris. Only one specimen from each place, among thousands 

 of other Pupillidce, etc. 



Strobilops labyrinthica texasiana n. subsp. 



Shell moderately elevated with dome-shaped spire, brown, whorls 

 5^, the first 1^ smooth, pale-corneous, the rest regularly ribbed 

 obliquel^^ the last whorl rounded periplierally or a trifle and obtusely 

 subangular in front, the riblets passing over undiminished upon the 

 base, which is as strongly sculptured as the upper surface (or sometimes 

 smoothish just in front of the aperture). Aperture with expanded, 

 thickened peristome and strong parietal callus, a single strong parietal 

 lamella emerging to the edge of the callus, a second weak one visible 

 within. About half a whorl inw^ard there is a series of about six laminae, 

 the inner one upon the columella, the next short, strong and tongue- 

 shaped, bending outward; the third nearly twice as long, high and 

 sinuous; the fourth very minute and low, often wanting, leaving a 

 space; the fifth and sixth long and low; and just above the periphery 

 on the outer wall a very weak, low, long seventh plica may usually be 

 traced. Umbilicus rather large. 



Alt. 1.5, diam. 2.2 mm. 



Types No. 91,330 A. N. S. Phila., from drift of the Guadalupe 

 river about four miles above New Braunfels, collected by Pilsbry and 

 Ferriss, 1903. Other localities in Texas are Austin (Pilsbry), San 

 Marcos (Pilsbry and Ferriss), New Braunfels (Ferriss, Pilsbry and Sing- 

 ley), Guadalupe river bottom, Victoria county, and Lavaca river, 

 Jackson county (J. D. Mitchell), Lee county (Singley), Calhoun county 

 (E. W. Hubbard), Gainesville (J. B. Quintard). A smaller form, diam. 

 2 mm., was taken in drift debris of the Hondo river about two miles 

 north of Hondo, Medina county (Ferriss and Pilsbry). It also ranges 

 northward into Indian Territory and to Kansas. 



