160 HELICID^E. 



pressed ; whorls seven, rounded, spirally striate, with 

 minute, delicate, impressed lines, the striae of increase 

 very distinct ; lip reflected below, simple above ; aper- 

 ture ovate ; umbilicus open, a little contracted by the 

 reflection of the lip ; base flattened-convex. 



Greatest transverse diameter nearly one and a half 

 inches. 



GEOGRAPHICAL DISTRIBUTION. Inhabits the Oregon 

 Territory from Fort Vancouver to the ocean, where it 

 was discovered by Mr Nuttall during his late expedition, 

 and also, rather commonly, by the U. S. Exploring 

 Expedition. 



REMARKS. This beautiful species is unlike any other 

 North American Helix, being much more brilliant in its 

 coloring and more striking in its markings than is com- 

 mon. The upper surface, in those specimens which 

 have come under my observation, is either light yellow, 

 strongly contrasted with a single dark band revolving on 

 the middle of the body-whorl, and on the lower edge of 

 the other whorls, or a light chestnut with a black band. 

 The lower surface, or base, is of a uniform dark chestnut 

 color. On some individuals there is a faint tracing 

 of intermediate bands, and some are quite destitute of 

 bands ; so that it is probable, that when the shell 

 becomes more common, it may be found that there is 

 considerable diversity of coloring and marking. The lip 

 varies from ashy-white to rufous. The revolving band is 

 generally obsolete on the three whorls nearest the apex. 



