STBEPTOSTYLA. 45 



S. EDWARDSIANA, Crosse and Fischer. PI. 10, fig. 51. 



Narrower than the preceding species, shining, striulate, suture 

 widely margined ; fulvous olivaceous, with light chestnut varici- 

 form strigations, aperture bluish white. Length, 36 mill. 



Orizaba, Mexico. 

 S. SIMILIS, Strebel. PL 10, fig. 54. 



Rather thin, translucent, shining, yellowish brown, with nar- 

 rower or broader darker streaks ; with impressed longitudinal 

 strife, visible near the suture ; no spiral sculpture ; on the body- 

 whorl there is a narrow colorless sutural zone. 



Orizaba, Mexico. 



S. CINGULATA, Crosse and Fischer. PI. 10, fig. 55. 



Thin, smooth, shining; pale olivaceous brown, with irregular 

 darker strigations ; suture with short, impressed lines ; aperture 

 bluish white. Length, 25 mill. 



Tuxtla, State of Vera Cruz, Mexico. 



S. NIGRICANS, Pfeiffer. PL 10, fig. 56. 



Moderately solid, polished, very minutely striate ; chocolate- 

 color, with narrow, distant fulvous strigations, suture light- 

 margined, the base yellowish brown, interior lighter chocolate. 



Length, 35 mill. 



Vera Paz, Central America. 



Var. ^9. Smaller and lighter-colored. Tabasco, Mexico. 



S. MITILEFORMIS, Shuttleworth. PL 10, fig. 57. 



Moderately solid, obsoletely striulate, polished, chocolate- 

 colored with a few wide yellowish brown strigations, base 

 yellowish brown, spire lighter-colored, with chestnut apex, suture 

 margined with an obsolete impressed line. Length, 26 mill. 



Cordova, Mexico. 



Smaller, narrower, the spire slightly more produced, and the 

 suture without the colored marginal band of the preceding 

 species. 



S. LURIDA, Shuttleworth. PL 10, fig. 59. 



Shining, obsoletely striulate, suture slightly channeled ; oliva- 

 ceous chestnut, lighter at suture and base. Length, 15 mill. 



Cordova, Mexico. 



