136 PROCEEDINGS OF THE ACADEMY OF [March: 
The shells figured by Binney as B. schiedeanus (Manual of American 
Land Shells, p. 399, fig. 437) are apparently B. d. liquabilis. They are 
certainly not the true schiedeanus, of which figures may be found in 
the Manual of Conchology. 
Bulimulus dealbatus (Say). PI.VI, fig. 13. 
Helix dealbata Say, Journ. Acad. Nat. Sci. Phila., II, p. 159, 1821. 
Say gave the localities ‘‘Missouri and Alabama.’’ His specimens 
in the Academy Museum are labelled Alabama. One of these three, 
agreeing with the dimensions given by him, is figured (pl. VI, fig. 13), 
as the type of the species. The Alabama form has a globose last whorl 
and rather large umbilicus. The aperture is a little more than half 
the total length of the shell, but much less than the diameter of the 
shell. The shell is profusely striped with ragged white stripes on a pale 
brownish ground. The type measures, alt. 19.4, diam. 12.2, length of 
aperture 10.6 mm. 
The same form occurs in Tennessee, Kentucky (Warren county), 
and west to Kansas (Shawnee county). Some specimens from the 
humid portion of Texas also seem to belong here. 
B. d. ozarkensis 0. subsp. PI. VI, fig. 14, 15. 
B. dealbatus Say, Pilsbry, Proc. A. N.S. Phila., 1903, p. 204 (Seligman, Mo.). 
On the northern and western borders of the Ozark uplift this form 
has been differentiated. The whole shell, and especially the last 
whorl, is narrower, the aperture is smaller, ordinarily half the total 
length or less, and the umbilicus is narrower. The shape is about that 
of B. d. ragsdalei, but the last whorl is not rib-striate, though the 
spire is weakly so. Coloration as in dealbatus. Specimens measure: 
Locality. Seligman. Rogers Mam. Spring. 
Alt. 26 21.6 2) mam: 
Diam. 13.2 10.5 11 ty 
Aperture 12.8 10 1035S 
Whorls i 7 64 
Limestone Gap, I. T. 
Alt. 22 21 20 20 17 mm. 
Diam. 11.3 11.2 9.7 10.8 9.4 
Aperture 11 10.2 9.5 10.8 9 a 
Whorls 64 64 62 64 6 
Distribution, northern and western outliers of the Ozark system: 
Mammoth Spring, Fulton county, Arkansas; Seligman, Barry county, 
southwestern Missouri (fig. 14); Rogers, Benton county, Arkansas 
(fig. 15); Limestone Gap, Choctaw Nation, Indian Territory. 
