CHAPTER LXIX: THE CYLINDER SHELLS 



Family CvLiNDRELLiDyE 



Shell screw-like, turreted, many-whorled, the last whorl 

 more or less contracted and detached; peristome reflected, pro- 

 longed, apex often cut off. Animal like Helix. 



Genus CYLINDRELLA, Pfr. 



Characters of the family. Many species of small mollusks, 

 of sluggish movements. West Indies. 



C. jejuna, Gld., is a small, solid, horn-coloured shell striped 

 lengthwise with fine white lines. Its tip is truncated, the free 

 round mouth protrudes in the form of a bell. Length, f inch. 



Habitat. — Mouth of Miami River, Fla. 



C. Poeyana, d'Orb., is stouter, pupiform, longitudinally 

 striated and white-lined. The animal walks by affixing the 

 extended snout and dragging the body up to the point. The 

 shell is carried in a horizontal position. The body is about one- 

 quarter as long as the shell. Length, f inch. 



Habitat. — Cuba, Southern Florida. 



Several West Indian species are slim as a match, a tightly 

 coiled spiral, with the little free cup-shaped peristome at right 

 angles with the spire. C. Blandianum, Cr. and Fisch., and C. 

 GiiesbregUi, Pfr., both Mexican, suggest by their form, size and 

 colouring a half-smoked cigar. 



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