] 60 



STREPTOSTYLA. 



44. S. MOHRIANA (Pfr.). 



Shell subcylindric, thin, smooth, pellucid, corneous-hyaline ; 

 spire slowly tapering, the apex rather obtuse; suture light, 

 distinctly margined. Whorls 6, a little flattened, the last sub- 

 equal to the spire. Columella somewhat calloused, lightly 

 twisted. Aperture narrow, oblong-acuminate ; peristome sim- 

 ple, slightly obtuse. Length 7.5, diam. 2.5, aperture 3 5 mm 

 (Pfr.). 



Eastern Mexico: Cerro de Borrego, near Orizaba (Mohr 

 collection) . 



Spiraxis mohriana PFR., Malak. BL, ix, p. 97 (1862); 

 Monogr., vi, p. 196. 



45. S. CLAVATULA Ancey. 



Shell small, at first sight resembling a Ferussacia of the 

 F. procerula group, thin, glossy, slightly striatulate obsoletely, 

 apparently pale corneous when fresh, whitish-hyaline when 

 dead, cylindric elongate, rather oblong. Spire produced, reg- 

 ularly tapering, obtuse, the apex large. Whorls 614, sub- 

 planulate, the suture appressed, not very distinct, with a pel- 

 lucid margin below; last whorl cylindric-oblong, somewhat 

 tapering at base. Aperture narrow above, dilated below: 

 columellar lamina short, not very strong, subcalloused, lightly 

 twisted spirally, the base slightly truncate. Peristome obtuse, 

 arched forward in the middle, receding at the base. Length 

 8.66, diam. 3, alt. apert, 4 mm. (Ancey). 



Central America ( ? ) . 



S. clavatula ANC., Nautilus, xvii, p. 56 (Sept. 1903). 

 'A small elongate shell resembling a Ferussacia" (Anc.). 



46. S. SUBCALLOSA (Pfeiffer). 



Shell subfusiforni-oblong, thin, smooth, glossy, pellucid, 

 hyaline-buff. Spire conic, obtuse; suture distinctly mar- 

 gined. Whorls 51/0, a little convex, the last nearly two-thirds 

 the total length, tapering basally. Columella somewhat cal- 

 loused, slightly twisted, subtruncate at base. Aperture ver- 

 tical, narrow, acuminate-oblong; peristome simple, the right 

 margin arching forward. Length 14, diam. 6. aperture 9x2 

 mm. (Pfr.). 



