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 débris 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 Gld. 
San Marcos, Hays county; Guadalupe river above New Braunfels, 
Comal county, and on the Hondo river, Medina county, Texas, in 
flood débris. Only one specimen from each place, among thousands 
of other Pupillide, etc. 
Strobilops labyrinthica texasiana n. subsp. 
Shell moderately elevated with dome-shaped spire, brown, whorls 
53, the first 14 smooth, pale-corneous, the rest regularly ribbed 
obliquely, the last whorl rounded peripherally 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 inward there is a series of about six lamine, 
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 débris 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. 
