STREPTOSTYLA. 147 



straw-colored periostracum axially zonate with lighter and 

 darker streaks following 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." (Dall). 



Mexico : Alvarez Mountains, State of San Luis Potosi (Dr. 

 E. Palmer). 



Streptostyla palmeri DALL, Smithsonian Miscellaneous Col- 

 lections, vol. 48, pt. 2, p. 191 (July 1, 1905). 



"This approaches 8. sallei Crosse & 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 difference in color. It has a shorter 

 spire than, and different color from S. shuttleworthi Pfeif- 

 fer" (Dall). 



Figured from one of the type lot, supplied by Dr. Dall. 



9. S. NOVOLEONIS Pilsbry. PI. 29, figs. 69, 70. 



Shell cylindric-oblong, blunt at the ends, dark reddish- 

 brown, very glossy, almost smooth, the growth-wrinkles being 

 inconspicuous. Spire short, conic, the apex obtuse. Whorls 

 6^2? slowly and irregularly increasing ; the first whorl widens 

 rapidly ; the latter part of the second whorl and first part of 

 the third are very narrow; following whorls regular. The 

 last whorl widens more rapidly, the suture in its later half or 

 three-fourths rapidly descending, the last whorl being more or 

 less deflexed at its termination. Aperture very long and nar- 

 row, its lower third somewhat dilated. Outer lip but very 

 slightly arched forward, scarcely retracted above. Basal mar- 

 gin somewhat retracted; columella short, rather thin, but 

 little twisted. 



Alt. 17.5, diam. 7.3, length of aperture 12.3 mm. 



Alt. 16, diam. 7, length of aperture 12.6 mm. 



N.-E. Mexico: Diente, near Monterey, State of Nuevo Leon. 



S. novoleonis PILS., Proc. A. N. S. Phila. 1899, p. 397; 

 1903, p. 774, pi. 48, f. 3, 3a. 



