DALL] NEW LAND-SHELLS FROM CENTRAL MEXICO Ig! 
whorls in the adult about seven, smooth, not wrinkled axially in 
front of the very distinct suture; spire rather blunt, the whorls 
between the sutures convex; sides of the last whorl somewhat 
parallel, apex and base of the shell about equally tapering; outer 
lip sharp, slightly sinuous; the aperture narrow behind and rather 
wide in front, the axis and pillar twisted as usual in the genus. 
Length of shell 40, of aperture 28, of last whorl 34 mm.; max. diam- 
eter 15.5 mm. . 
Habitat—Alvarez Mountains, State of San Luis Potosi, at a 
height of 7,200 feet. 
Type, No. 110,395 U. S. Nat. Museum. 
This species has a straighter columella than any of its size, and 
in a general way appears nearest allied to S. sallei and S. edward- 
siana Crosse and Fischer, from which it is sufficiently distinct. It 
appears, from the number collected, to be quite common, though 
few of the specimens were adult or in perfect condition. 
STREPTOSTYLA PALMERI n. sp. 
Shell small, slender, subtranslucent, with a pale thin straw-colored 
periostracum axially zonate with lighter and darker streaks follow- 
ing the lines of growth; whorls six, the last much the largest, spire 
rather blunt, the suture evident but not deep, appressed, and without 
axial wrinkles in front of it; pillar white, slightly thickened and 
twisted about a pervious axis; length of shell 24.5, of aperture 20, 
of last whorl 22.25 mm., max. diameter 9.5 mm. 
Habitat.—With the preceding species. 
Type, No. 110,394 U. S. Nat. Museum. 
This approaches S. sallei Crosse and Fischer but is more slender, 
has a shorter spire and is of a lighter make and color. From S. 
potosiana of the same size it is distinguished by its more slender 
build, more produced spire, and pervious axis, as well as by the 
differences in color. It has a shorter spire than, and different color 
from, S. shuttleworthi Pfeiffer. 
SCHAZICHEILA PALMERI n. sp. 
(PLATE XLIV, FicuRES 3, 5) 
Shell gompact, elevated, with a rather pointed spire, well marked 
suture and about five whorls; color varying from white, through 
straw color to pale olive, yellow, or various shades of salmon color, 
‘surface polished but not smooth, being rather rudely marked at 
intervals by prominent incremental lines and faint spiral or irreg- 
ular striule seldom visible without a glass; aperture gibbous, the 
