58 HELIX. 



H. CUMBERLANDIANA, Lea. PI. 10, fisfs. 49-51. 



/ / O 



Widely umbilicated, acutely carinate, plicate-costate, light 

 corneous, strigate and maculate with chestnut; whorls 5, rather 

 flat, subexserted, the last not descending, with a compressed 

 crenate carina on the periphery ; aperture oblique, securiform. 



Diam. 14 mill. 



Cumberland Mis., E. Tennessee. 



See remarks under the preceding species. 



H. SOLITARIA, Say. PL 10, figs. 52-55. 



Umbilicated, somewhat solid, diaphanous, closely obliquely 

 rugosely striate ; yellowish corneous, with two or three chestnut 

 bands; whorls 6, convex, with deep suture; aperture white, 

 shining, showing the bands through the shell. Diam. 25 mill. 

 Interior United States; valleys of the Mississippi 



River and its northern tributaries. 



The variations include light-colored specimens, without bands, 

 and dark specimens caused by the widening and diffusion of the 

 bands over the entire surface. H. Kochi, Pfr. (fig. 55), may be 

 considered a synonym. 



H. SUBRUDIS, Pfr. PI. 10, fig. 56. 



Moderately umbilicated, somewhat solid, rather rudely ob- 

 liquely striate, light^ decussated by close spiral striae, opaque, 

 whitish, with a wide violaceous brown band at the suture, and 

 another, narrow, at the periphery ; whorls 5, a little convex, the 



last narrow, not descending. Diam. 17'5 mill. 



Hob. unknown. 

 Perhaps a small specimen of the preceding species. 



H. ARECIBENSIS, Pfr. PI. 10, figs. 57-59. 



Moderately umbilicated, thin, obliquely striated and obso- 

 letely subgranulated by spiral lines, pellucid, wax} T white ; 

 whorls 3 j, the last not descending, acutely carinated, base con- 

 vex. Diam. 17 mill. 



Porto fiico, W. Indies. 



H. DISCOIDES, Lesson. (Unfigured). New Ireland. 



A doubtful species, known only by a very short description. 



