134 PROCEEDINGS OF THE ACADEMY OF [March, 



in characters, and easily recognized. It is the only Bulimulus found 

 in the greater part of the region it inhabits, and is one of the com- 

 monest forms in collections. 



The specimens seen from Fort Worth are not unlike those referred 

 to B. d. liquabilis from Waco, and it is not easy to decide upon which 

 race they belong to. They are undifferentiated forms. 



In Comal, Guadalupe, Bexar and Medina counties we found only 

 typical mooreanus. In Frio county the shells are somewhat more 

 solid and often whiter. In a series of 313 specimens from along the 

 Guadalupe river above New Braunfels (pi. VI, figs. 2, 3, 4) I could 

 find but one shell with any of the ragged stripes of B. d. liquabilis. 

 In 165 taken along the river below San Antonio (pi. VI, fig. 1) there 

 were 7 with some ragged stripes, at least on the upper whorls. A 

 series of 55 mooreanus from Victoria had 4 striped shells (pi. VI, figs. 

 5, 6). The percentage of intergrading specimens is therefore small. 



B. dealbatus liquabilis (Reeve). PI. VI, figs. 7-:2. 



Bxdimus liquabilis Reeve, Conch. Icon., V, pi. 57, fig. 387 (Dec, 1848). 

 Bulimus confinis Reeve, Conch. Icon., V, pi. 86, fig. 643 (Feb., 1850). 

 Bulimulus schiedeanus Pfr., W. G. Binney, Terr. Moll., V, p. 391, fig. 276, but 

 not the description. 



The shell is thin, variable in shape but usually obese, the aperture 

 half the total length or more. Translucent-corneous or brownish- 

 corneous, more or less profusely marked with opaque whitish ragged 

 streaks. Interior whitish or colored like the outside. 



This is the form of the humid Austroriparian zone in Texas, as B. d. 

 mooreanus is of the arid division. Specimens are before us from the 

 following counties: Dallas, McLennan, Coryell, Bell, Travis, Lee, Hays, 

 Jackson, Nueces. Also from Limestone Gap, Indian Territory. 



Where the range of liquabilis adjoins that of mooreanus there is a 

 belt of overlapping ; but so far as we know the two do not actually occur 

 together. At San Marcos, Hays county, for instance, B. d. liquabilis 

 lives on the moist low alluvium along the San Marcos river, while B. 

 d. mooreanus is found on the Cretaceous limestone hills above the town. 

 It seems that the one form extends finger-like up some of the streams, 

 while the other may occupy intervening upland or calcareous stations. 



B. liquabilis and B. confinis were both described from "Texas." 



B. d. liquxibilis differs from mooreanus by the predominance of 

 corneous-brown coloring. It is also usually more globose and less 

 smooth. It is more globose than B. dealbatus, with less convex 

 whorls, as a general rule, yet there seems to be practically complete 

 intergradation between the races, and some Texas shells are not dis- 



