130 PROCEEDINGS OF THE ACADEMY OF [March, 



any but the smallest texasiana, and with about the same number of 

 whorls (5 to 5^) appears more closely coiled. It is constantly dis- 

 tinct by the elongated columellar tubercle within the last whorl (shown 

 in fig. 9). This tubercle seems to be what Binney erroneously describes 

 as "an internal transverse tubercle on the base of the shell" — an ex- 

 pression which would lead one to expect such a structure as that 

 found in the Stenotremas. Binney states that the color is ''white," 

 but fresh shells are brownish-corneous, a little paler and somewhat 

 transparent at the base. The diameter varies from 6.5 to 8 mm. 

 Variation in the degree of elevation is shown in the figures. 



P. mooreana was originally described from Washington county, 

 Texas. We took specimens at Smithville, Bastrop county, San Mar- 

 cos, Hays county, around New Braunfels, Comal county (figs 4^7), 

 and on the Hondo river north of Hondo, Medina county (figs. 8, 9, 10), 

 ever3nvhere in copious quantity. There are also specimens before 

 us from Washington county, Belton, Fort Worth, Waco, Austin and 

 Lee county. Further records are given by Mr. Singley in his valuable 

 catalogue. It was taken at Galveston by Ferriss. 

 Polygyra mooreana tholus (W. G. Binn). PI. V, figs, l, 2, 3. 



Larger than mooreana, with the last whorl far more openly coiled 

 below, exposing more of the penultimate whorl in the much wider 

 umbilicus. Specimens from Washington county measure : 



Alt. 5.5, diam. 11, width of umbilicus 4.2 mm.; whorls 7. 



Alt. 4, diam. 8.2, width of umbilicus, 3 mm.; whorls 6. 



This form holds such a relation to P. mooreana as P. d. sampsoni to 

 P. dorjeuilliana, being very openly coiled beneath, with a deep and 

 very long groove on the last whorl within the umbilicus. The internal 

 ridge is like that of P. mooreana. It seems to be comparatively local in 

 distribution and is certainly rare. We have never seen a fresh specimen. 

 It was described from Washington county, Texas, the locality of the 

 specimens figured. It is in the collection of the Academy also from 

 Calhoun county. Ferriss took a few specimens at Galveston, and Sing- 

 ley found it in Fort Bend and Brazos counties. Von Martens reports 

 a worn specimen found by Fried el at Vera Cruz, Mexico. 

 Polygyra roemeri (Pfr.)- 



Smithville, Bastrop county, Texas (Ferriss); San Antonio, Bexar 

 county (Pilsbry and Ferriss) ; near New Braunfels, Comal county, one 

 specimen (Pilsbry). 



BULIMULID^. 



The genus Bulimulus in Texas has caused much perplexity to stu- 

 dents. Many and diverse have been the views held as to the rank 



